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Total of 158 patents found where: Class is '174'; Subclass is '209';

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T / S	Patent	Date	Description	Patentee	Category	Assigned To
		1851
U	8,418	October 14, 1851	Improvement in Insulators for Telegraph Wires Metal or cast iron insulator with cupped dry area at bottom. Glass poured in with a conductor supporting iron rod embedded in the glass, and the cupped is coated or lined with glass, porcelain, or enamel. The bottom skirt is slanted inward 45 degrees to prevent water from splashing up inside wetting the interior surface. This feature was utilized in U-983 and U-984 made by the U. S. Pottery Co. in Bennington, VT.	BATCHELDER, John M.	Metal
		1866
U	51,934	January 9, 1866	Improvement in Telegraph Insulators Hook with improved rubber cap and flared top	ELY, Alfred B.	Hook
U	51,935	January 9, 1866	Improvement in Insulating Telegraph Wires Paraffin and rubber insulated wire	ELY, Alfred B.	Paraffin
U	52,761	February 20, 1866	Improvement in Telegraph Insulators Hook screwed into block of vulcanite	SMITH, William W.	Hook
U	53,201	March 13, 1866	Telegraph Insulator Hook with glazed enamel at right angle to square pointed shank	WADDELL, William W.	Hook
U	53,426	March 27, 1866	Improvement in Telegraph Insulators Hook covered with rubber attached to rubber hollow ball chamber	ELY, Alfred B.	Hook
		1867
U	63,206	March 26, 1867	Improvement in Insulators for Telegraph Wires Hook encased in metal or wood allows arcing to ground	BROOKS, David	Hook
R	2,717	August 6, 1867	Improvement in Insulators for Telegraph Wires Hook cemented in glass & metal case with sulfur (reissue of 45,221)	BROOKS, David	Hook
U	69,622	October 8, 1867	Improvement in Insulators for Telegraphs Hook in blown glass cemented with sulfur in metal case	BROOKS, David	Hook
		1868
U	76,960	April 21, 1868	Improvement in Insulators for Telegraphs Oil, wax or rubber saturated insulator to improve same (Brown p. 57)	VARLEY, Cromwell F.	Oil
		1872
U	129,724	July 23, 1872	Improvement in Insulators for Telegraphic Uses Roughened lower surface of insulator to retain patented coating mixture	FARMER, Moses G.	Rough
		1878
U	201,615	March 26, 1878	Improvement in Insulators for Telegraph Wires Oil cup insulator	JOHNSON, Walter C. PHILLIPS, Samuel E.	Oil
		1883
U	269,933	January 2, 1883	Insulator for the Suspension of Electrical Wire Conductors Hook insulator of ""gelatinized or vulcanized fiber""	HIGGS, Paget COURTENAY, William	Hook
U	287,830	November 6, 1883	Telegraph Insulator Composition insulator (paper covered wooden insulator) (Brown p. 59)	HINSDALE, Charles C.	Composition
		1884
U	293,242	February 12, 1884	Insulator for Electric Wires Hook with different shape and glazed to screw into pole or crossarm	HALE, Albert W.	Hook
U	294,384	March 4, 1884	Insulator for Electric Conductors Hook with metal glazed coated surface (improvement of 293,242)	HALE, Albert W.	Hook
U	296,881	April 15, 1884	Insulator Rubber covered ring and knob with lag screw	SEELY, John A.	Rubber
U	297,683	April 29, 1884	Telephone Line Insulator and pin coated with waterproof compound	DOOLITTLE, Thomas B.	Miscellaneous
U	301,446	July 1, 1884	Insulator for Electric Wires Hook with glazed covering (see 293,242 and 294,384)	HALE, Albert W.	Hook
		1885
U	319,447	June 9, 1885	Insulator Wire groove projections through metal cover to contact wire	BROOMHALL, George L.	Wire
		1887
U	360,354	March 29, 1887	Insulator Acoustic insulator to reduce vibration of telephone wires in acoustic or mechanical telephones	LOCKE, Willie F.	Acoustic	1/2 to John E. Robertson
		1889
U	396,334	January 15, 1889	Overhead Insulator Composition ""Gilsonite"" insulator & metal/wood covering (Brown p. 60)	GILSON, Samuel H.	Composition
		1891
U	444,879	January 20, 1891	Insulator Tree hanger	ELKINS, Charles	Tree
U	445,008	January 20, 1891	Insulator Protective shield for trolley hanger insulator	VOGLER, William	Protective Shield
U	455,107	June 30, 1891	Insulator Third rail insulator with cup to hold hygroscopic chemical and means to heat insulator to drive off moisture	MUNSIE, James F.	Third Rail
U	461,631	October 20, 1891	Insulating Support for Electric Conductors Oil insulator	HEWETT, Robert J.	Oil
		1892
U	482,872	September 20, 1892	Insulator Strain type	LEE, Charles T.	Strain	The Johns-Pratt Co.
		1894
U	520,602	May 29, 1894	Insulator Composition insulator with ears bent over to secure cable	LUSCOMB, Henry H.	Composition
U	524,659	August 14, 1894	Insulator Oil cup with means to support the cup from the insulator (see 517,634)	WINSLOW, George H.	Oil
U	527,317	October 9, 1894	Insulator Protective shield for wire groove	BULLOCK, Edward J.	Protective Shield
U	530,706	December 11, 1894	Insulator Composition insulator with clip ears	MCCARTHY, Louis	Composition
		1895
U	541,332	June 18, 1895	Insulator Miscellaneous 2-part insulator for barbed wire fence	PATTERSON, James M.	Miscellaneous
		1896
U	562,166	June 16, 1896	Insulator Glass insulator with side conductor groove, threaded mounting pin, and hexagonal head to turn the insulator with a wrench for mounting in a wooden crossarm. A metal reinforcing pin is molded in the threaded end. (see patent gb1896-0019650)	BLANKINSOP, Thomas BROWN, Joseph W.	Insulator
U	566,045	August 18, 1896	Insulator for Electrical Purposes Protective shield of metal with non-conducting enameled coating	WHITAKER, Alfred J. P. TREHARNE, Frederick G.	Protective Shield
U	573,092	December 15, 1896	Insulator Insulator of two materials combined	LOCKE, Fred M.	Insulator
		1897
U	578,825	March 16, 1897	Insulator Composition insulator with top cable clamp	LUSCOMB, Henry H. CRANE, William F. D.	Composition	The Johns-Pratt Co.
U	580,628	April 13, 1897	Insulator and Insulating Conduit or Tubing for Electrical Purposes Composition insulator of asbestos and cement	TREHARNE, Frederick G.	Composition
U	592,505	October 26, 1897	Electrical Insulator Protective coating of elastic material and wire groove protector	BARBOUR, Wellington	Protective Coat
U	595,827	December 21, 1897	Insulator Bracket Clamp type composition insulator with top cable clamp	WOOLSEY, Charles A.	Clamp Type
		1899
U	634,568	October 10, 1899	Insulating Support for Electric Wires CD 309, U-416, under-crossarm type for better protection from rain	BEAL, Carroll N.	Insulator
		1900
U	664,301	December 18, 1900	Insulator M-2795, top is flattened cone with vertical flange & detachable spout	STERLING, Richard H.	Insulator	The Stanley Electric Mfg. Co.
		1901
U	666,586	January 22, 1901	Insulator Insulator & crossarm (glass) reinforced with embedded metal wires	WOOLBERT, Henry W.	Insulator
U	682,709	September 17, 1901	Insulator Knob to support underground conduit electric railways	JENKINS, Wilton F.	Knob
U	686,609	November 12, 1901	Insulating Support for Electric Wires CD 309.5, Telluride ""Type B"" under-hung combined insulators	HEMINGRAY, Ralph G.	Insulator
		1903
U	726,651	April 28, 1903	Electric Wire Support Glass insert in crossarm to insulate a steel pin that supports the conductor	CULLEN, Beauregard	Pin
U	746,469	December 8, 1903	Electrical Wire Support Wire support of cylindrical shape & metal support bolt to underhang wire	CULLEN, Beauregard	Wire
		1904
U	749,335	January 12, 1904	Insulator Electrose insulator to hold heavy conductor on top (similar to 578,825)	STEINBERGER, Louis	Electrose
U	750,722	January 26, 1904	Insulator Metal encased insulator with metal cap to hold cable (Brown p. 25)	STEINBERGER, Louis	Metal
U	751,664	February 9, 1904	Electric Insulator Composition insulator of asbestos (Brown p. 57 & 71)	LYMAN, Thomas T.	Composition	H. W. Johns-Manville Co.
U	757,765	April 19, 1904	Insulator Cleat - self-tying	OSBORNE, John W.	Cleat
U	758,986	May 3, 1904	Tubular Insulator Cylindrical insulator	LOCKE, Fred M.	Cylinder
U	775,986	November 29, 1904	Insulator miscellaneous with flared skirt to hold paraffin	OAKMAN, Samuel	Miscellaneous	Luther A. Wright
		1905
U	786,472	April 4, 1905	Insulator for the Conductors of Electric Railways Third rail insulator (England; Ohio Brass) (Brown p. 75)	WARD, Frank D. FURNISS, Harry C.	Third Rail	1/3 to Henry Bradford
U	795,520	July 25, 1905	Strain Insulator Deadend composed of multiple parts	LAPP, John S. WATTS, Arthur S. GODDARD, Walter T.	Deadend	Locke Insulator Mfg. Co.
U	795,521	July 25, 1905	Insulator Deadend composed of multiple parts	LAPP, John S.	Deadend	Locke Insulator Mfg. Co.
U	803,010	October 31, 1905	Insulator Pin with grooved insulator on top of crossarm to catch wire if it falls off of insulator	MORRIS, Elmer P.	Pin
		1906
U	836,122	November 20, 1906	High Potential Insulator Pin of bolt (tapered) in tapered hole (see 685,776)	LOCKE, Fred M.	Pin
U	838,163	December 11, 1906	High Tension Insulator Multipart with multiple petticoats under skirts (M-4325C, M-4415, M-4600) (see ID 5166)	BAUM, Frank G.	Insulator
U	838,482	December 11, 1906	Insulator for Line Conductors Insulator formed with recesses for pipe pin and metal insert crown	WEED, James Murray	Insulator
		1907
U	842,941	February 5, 1907	Insulator Multipart insulator with groove on one side and bracing pin to hold against the strain of the line wire	CLARK, Walter G.	Multipart
U	848,506	March 26, 1907	Insulator Pin and Support Therefor Pin made of Electrose	STEINBERGER, Louis	Pin
U	868,122	October 15, 1907	Electric Insulator Multipart with glass skirt and two-piece head similar to Locke 25	POINAN, Francis J.	Multipart
U	872,569	December 3, 1907	System of Insulation for High Voltage Electric Conductors Insulator system for high voltage conductors	LOCKE, Fred M.	Insulator
		1908
U	880,121	February 25, 1908	Electrical Insulator Knob wiring insulator composed of two or more discs to secure individual wires from each other and the supporting nail or screw.	BOLTON, Daniel G.	Knob
U	887,336	May 12, 1908	Electric Insulator Radio antenna strain insulator made weatherproof with a metal cover.	MIETH, Herman	Radio Antenna
U	893,265	July 14, 1908	Insulator Multipart insulator where parts are screwed together	RICHARD, Augusto	Multipart
U	898,921	September 15, 1908	Insulator Dry-spot, English screw cap design	PURVES, Thomas F. SINNOTT, John	Dry-spot
U	902,262	October 27, 1908	Insulator Protector Covering for insulator	SPARKS, Robert Romney	Covering
U	904,592	November 24, 1908	Electrical Conductor Support Multipart insulator attached on top to a bracket and has hook pin screwed in pinhole to hang line wire below	ALLEN, John Scott	Multipart
		1909
U	917,785	April 13, 1909	Insulating Support for High Tension Conductors Suspension support system	MERSHON, Ralph D.	Suspension
		1910
U	964,737	July 19, 1910	Insulated Distributor for Electric Service Wires Wireholder for multiple drop wires suspended under the crossarm	ASHLEY, John B.	Wireholder
U	972,994	October 18, 1910	Insulator Insulator base curve to fit flush with matching curved top of crossarm	CAMPBELL, John H.	Insulator
U	974,672	November 1, 1910	Insulator Suspension insulator	JOHNSTON, Robert M.	Suspension	The Ohio Brass Co.
		1911
U	998,359	July 18, 1911	High Voltage Insulator Suspension type	LOCKE, Fred M.	Suspension	Locke Insulator Mfg. Co.
U	1,006,040	October 17, 1911	Insulator Suspension using multiple parts connected with a cable	ALSBERG, Julius	Suspension
U	1,006,041	October 17, 1911	Insulator Suspension using multiple parts connected with a cable	ALSBERG, Julius	Suspension
U	1,006,042	October 17, 1911	Insulator Suspension using multiple parts connected with a cable	ALSBERG, Julius	Suspension
U	1,010,011	November 28, 1911	Sectional Insulator Multipart insulator to support high tension conductors in substation	AUSTIN, Arthur O.	Multipart	The Ohio Brass Co.
		1912
U	1,020,122	March 12, 1912	Electrical Insulator miscellaneous complicated design of multiple parts and cemented bushing	BOLTON, Daniel G.	Miscellaneous	Frank S. Diener
U	1,043,321	November 5, 1912	Combined Insulator and Current Distributor Miscellaneous style with attachment for multiple current distributors (see 1,085,813)	KNUTZ, Ernest H.	Miscellaneous
		1913
U	1,056,998	March 25, 1913	Insulator Means of insulating and supporting a bussbar.	JAMIESON, Bertrand G. KELLER, Carl A.	Bussbar
U	1,072,524	September 9, 1913	Insulator Odd system for suspending power lines	STEINBERGER, Louis	Electrose
		1914
U	1,084,147	January 13, 1914	Support for Electric Service Wires Bulbous insulator mounted on a crossarm pin to allow tie-off and running multiple service wires from the main power conductor	HOPKINS, Guy	Service Drop
U	1,085,813	February 3, 1914	Insulator and Current Distributor Miscellaneous style with attachment for multiple current distributors (see 1,043,321)	KNUTZ, Ernest H.	Miscellaneous
U	1,091,678	March 31, 1914	Insulating Composition Boro-silicate glass	LOCKE, Fred M.	Boron
U	1,093,480	April 14, 1914	Insulator Multipart same as 1,093,479 with plug to block cement from air pocket	SANFORD, JR., Joseph A.	Multipart	The R. Thomas & Sons Co.
U	1,102,656	July 7, 1914	Insulator Insulator with hole in center and method to clamp conductor securely and the metal bracket with two bolts to secure the insulator	HADEN, Robert B.	Insulator
U	1,116,631	November 10, 1914	Insulator Self-tying slot top for slack wire use	SCHISLER, Frank J.	Self-tying Slot Top
U	1,122,326	December 29, 1914	High Potential Insulator Multipart insulator made of Electrose	STEINBERGER, Louis	Multipart
		1915
U	1,127,474	February 9, 1915	Insulator Support Glass insulator with tapered pin base that fits inside the insulator to secure the wire which passes through a vertical slot in the sides of insulator and wedged between the base and insulator held together by a bolt that runs through the insulator and angle-iron crossarm	MARDOCK, Guy	Insulator
U	1,128,424	February 16, 1915	Insulator Suspension multipart insulator fitted with arcing horns	DUNCAN, John D. E.	Suspension
U	1,128,747	February 16, 1915	Method of Manufacturing Porcelain Insulators Manufacturing process for porcelain insulator firing unglazed, then filling porous porcelain with oxidizable oil and rendering the oil stable with ozone to form a coating to replace expense of firing on a glaze	BOEHM, Wilhelm	Manufacturing
U	1,164,739	December 21, 1915	Method of Making Insulating Devices Manufacturing technique to make long bushings with petticoats by stacking them on a fired core and fusing the petticoats to the core	MERSHON, Ralph D.	Manufacturing
		1916
U	1,182,940	May 16, 1916	High Voltage Insulator Suspension, two part made of Electrose	STEINBERGER, Louis	Suspension
U	1,190,766	July 11, 1916	Insulating Support Battery support insulator	HUBBARD, Albert S.	Battery	Gould Storage Battery Co.
U	1,198,137	September 12, 1916	Insulator Suspension insulator with an outer covering of spun steel or iron.	LINCOLN, Paul M.	Suspension	Westinghouse Electric & Mfg. Co.
U	1,206,160	November 28, 1916	High Potential Insulator Electrose modified pin type	STEINBERGER, Louis	Electrose
		1917
U	1,225,147	May 8, 1917	Insulator Boro-silicate glass	LOCKE, Fred M.	Boron
U	1,233,486	July 17, 1917	Electrical Insulator Boro-silicate glass	LOCKE, Fred M.	Boron
U	1,237,843	August 21, 1917	Insulator Support for Towers An insulator to support radio antenna towers composed of a metal base and several porcelain sections that are cemented together.	WARD, John W.	Antenna Support	Pittsburg High Voltage Insulator Co.
U	1,241,528	October 2, 1917	Insulator Suspension with shells nested together by means of external threads	LINCOLN, Paul M.	Suspension	Westinghouse Electric & Mfg. Co.
		1919
U	1,292,451	January 28, 1919	Line Wire Insulator miscellaneous	FORT, Louis	Miscellaneous
U	1,304,623	May 27, 1919	Glass Boro-silicate glass (Corning Pyrex glass)	SULLIVAN, Eugene C. TAYLOR, William C.	Boron	Corning Glass Works
		1921
U	1,384,214	July 12, 1921	Insulator Self-tying by means of an upper and lower cylindrical block fitted into a hole and secured with a screw plug.	SANDS, Richard	Self-tying
		1923
U	1,474,256	November 13, 1923	Insulator Special columnar insulators to support structure for a radio transmitter	GODDARD, Walter T.	Radio	Locke Insulator Corp.
		1924
U	1,484,569	February 19, 1924	Ceramic Body Method of making a suspension disk by inserting a fired porcelain part inside the bottom of an unfired disk, then firing the disk, which shrinks around the insert securing a cemented pin inside	SCHEID, Johannes Friedrich	Suspension	H. Schomburg & Shone
U	1,516,585	November 25, 1924	Insulator Cylindrical strain insulator with ribs and metal caps on the ends	AUSTIN, Arthur O.	Strain	The Ohio Brass Co.
U	1,520,984	December 30, 1924	Electric Insulator Suspension insulator composed of several parts to withstand tension	THOMAS, Percy H.	Suspension	Westinghouse Electric & Mfg. Co.
		1926
U	1,599,580	September 14, 1926	Insulator Multipart insulator with bowl underneath to balance electrical field	MILLER, Frederick H.	Multipart	Westinghouse Electric & Mfg. Co.
		1928
U	1,657,922	January 31, 1928	Method of Assembling Insulators Sprayed coating of metal or asphalt with heat treatment to improve cement joint	GODDARD, Walter T.	Cement	Locke Insulator Corp.
U	1,661,823	March 6, 1928	Insulator Suspension string with insulators having conducting surface to balance electrical field	HAWLEY, Kent A.	Suspension	Locke Insulator Corp.
U	1,664,208	March 27, 1928	Insulator Suspension fog-type with ceramic covered wood/fiber connecting tube	GILCHREST, George Irving	Suspension	Westinghouse Electric & Mfg. Co.
U	1,669,529	May 15, 1928	Insulator Suspension fog-type with wood strain insulator for connecting to another insulator	MILLER, Frederick H.	Suspension	Westinghouse Electric & Mfg. Co.
		1929
U	1,700,166	January 29, 1929	Insulator for Bridle Wires Dry-spot using coke bottle top & cap	JOHNSON, Benjamin	Dry-spot	American Telephone & Telegraph Co.
U	1,701,561	February 12, 1929	Insulator CD 118; Carrier circuit insulator with metal cover screwed outside (internal threads)	GORDON, Chester S.	Carrier	American Telephone & Telegraph Co.
U	1,725,097	August 20, 1929	Insulator Structure Metal parts of suspension insulators are coated with rubber or resin to help prevent or reduce flashover	NAYLOR, William K.	Suspension	Westinghouse Electric & Mfg. Co.
U	1,728,522	September 17, 1929	Insulator for High Voltage Systems Suspension disk with strips of high resistance conductive material embedded in the upper surface to produce a uniform distribution of voltage across each disk in a string	BAUM, Frank G.	Suspension	Westinghouse Electric & Mfg. Co.
U	1,730,171	October 1, 1929	Insulator Design with metal pin and metal projections to prevent arc-over	SMITH, Harold B.	Suspension	Westinghouse Electric & Mfg. Co.
		1930
U	1,748,884	February 25, 1930	Leakproof Insulator Bell shaped radio antenna insulator to protect wire from getting wet from rain or snow.	KITTS, David Roscoe	Antenna
U	1,755,587	April 22, 1930	Insulating Device Crossover	BROAD, William	Crossover	3/4 to Harry McLain
U	1,768,948	July 1, 1930	High Voltage Insulator Suspension insulator	BAUM, Frank G.	Suspension	Westinghouse Electric & Mfg. Co.
U	1,778,152	October 14, 1930	Multiple Skirt Suspension Insulator Odd two-disk suspension made in one piece with metal caps on each end	HAWLEY, Kent A.	Suspension	Locke Insulator Corp.
U	1,784,392	December 9, 1930	Manufacture of Insulators Suspension insulator with glazed sanded surfaces to improve strength of cap	ROWLAND, Davidge H.	Suspension	Locke Insulator Corp.
		1931
U	1,799,580	April 7, 1931	Insulator Suspension insulator composed of wood fibers impregnated with tar	BURKE, Edmund	Suspension	Brown Co.
		1932
U	1,861,316	May 31, 1932	Insulator Suspension (Hewlett type) with oil reservoir	MONTANDON, Arthur	Suspension	1/2 to Societe Gen. D'Entr.
U	1,877,630	September 13, 1932	High Tension Insulator Multipart cementing technique using a resilient layer or shaped sleeve	SCHEID, Johann Friedrich	Multipart	Hermsdorf-Schomburg-Isolatoren G. M. B. H.
		1933
U	1,937,964	December 5, 1933	Insulator Support for Tower or Mast Type Antenna Insulator for supporting radio tower or mast antenna	JENNER, Ralph L.	Antenna	Lapp Insulator Co., Inc.
		1934
U	1,960,147	May 22, 1934	Insulator and Method of Treating It Suspension, glass under cap is etched & treated with graphite	FULCHER, Gordon S.	Suspension	Corning Glass Works
		1935
U	1,987,683	January 15, 1935	Insulator RFI: coat crown with copper glaze to prevent AM radio interference	HUNT, Marsden H. BARROW, George M.	RFI	Westinghouse Electric & Mfg. Co.
U	1,994,281	March 12, 1935	Insulator Fog type multipart & suspension insulator similar to oil types with inverted mating cup	LUSIGNAN, JR., Joseph T.	Fog Type	The Ohio Brass Co.
		1937
U	2,094,287	September 28, 1937	Method of Manufacturing Multipart Glass Articles Method to manufacture multiple glass objects (blocks, insulators, etc.)	ZIMMERMAN, Willard P. HOLMES, Minot K.	Method	Owens-Illinois Glass Co.
		1938
U	2,135,558	November 8, 1938	Insulator Shield Protective shield	BOTT, Perry J.	Protective Shield
		1939
U	2,154,387	April 11, 1939	Electric Insulator RFI: coat crown with metallic glaze to prevent radio interference (advertised in Electrical World 8-12-1939)	SLEEMAN, Harold P.	RFI	The R. Thomas & Sons Co.
U	2,157,100	May 9, 1939	Glazed Ceramic Insulator and the Like Glaze - compression glaze	ROWLAND, Davidge H.	Glaze	Locke Insulator Corp.
U	2,165,773	July 11, 1939	Insulator for Communication Systems CD 142, CD 142.4 - glass insert screwed in skirt with metallic iridizing	WHEEER, Herbert H. MCGINNIS, Orris	Insulator	Western Union Telegraph Co.
U	2,173,292	September 19, 1939	Insulator Suspension cap design to allow for expansion of the cap without breaking off the insulator head	AUSTIN, Arthur O.	Suspension	The Ohio Brass Co.
U	2,173,510	September 19, 1939	Conducting Holder for Luminous Tube Terminals Neon terminal holder	BELLOWS, Lewis F. R.	Neon
		1940
U	2,191,152	February 20, 1940	Electrical Insulator CD 240.2 with metal saddle embedded in crown for RFI (see 2,089,791)	HAMMEL, Victor F.	Insulator
U	2,194,189	March 19, 1940	Pole Line Insulator CD 142, CD 142.4 - tin & iron for iridized coating to reduce water adherence	WHEELER, Herbert H. MCGINNIS, Orris THORDARSON, William	Insulator	Western Union Telegraph Co.
		1941
U	2,239,809	April 29, 1941	Insulator Suspension insulator and method of applying RFI coating	BURLESON, Wade H.	RFI	The Ohio Brass Co.
U	2,250,044	July 22, 1941	Insulator Multipart insulator with glazed sanded surfaces to improve strength of cap	CROSKEY, Carl D. ROWLAND, Davidge H.	Multipart	Locke Insulator Corp.
		1942
U	2,270,964	January 27, 1942	Insulator for Antenna Span or Guy Ropes Compression antenna insulator for very heavy loads (see 2,297,430)	PETERS, Wilhelm	Strain	Telefunken Geselleschaft fur Drahtlose Telegraphie m. b. H.
U	2,274,955	March 3, 1942	High Tension Electric Insulator and Method of Coating Same RFI: antimony coated top	DYKSTRA, Laurence J. MEYER, Edwin M.	RFI	Victor Insulators, Inc.
U	2,281,173	April 28, 1942	Insulator and Method of Producing Conducting Coating Thereon RFI prevention using an inexpensive glaze coating	SANTOMIERI, Sebastian L.	RFI	Victor Insulators, Inc.
U	2,287,976	June 30, 1942	Insulator Glaze - compression glaze & sand joint	CROSKEY, Carl D. ROWLAND, Davidge H.	Glaze	Locke Insulator Corp.
U	2,292,248	August 4, 1942	Bushing Bushing composed of several parts with open chambers	STEVENS, Leland J.	Bushing	Locke Insulator Corp.
		1943
U	2,317,799	April 27, 1943	Line Insulator Insulator composed of a metallic hollow shell coated with ceramic material	PERLES, Maurice	Insulator	Mycalex Corp. of America
		1945
U	2,389,386	November 20, 1945	Glazed Ceramic Compression glaze	RUSSELL, JR., Ralston	Glaze	Westinghouse Electric Corp.
		1947
U	2,418,713	April 8, 1947	Thermally Toughened Insulator CD 228.5: tempering the surface of glass insulators for added strength	HOLMES, Minot K. PLUMMER, Jesse H.	Insulator	Owens-Illinois Glass Co.
		1948
U	2,437,593	March 9, 1948	Reinforced Wire-Contacting Insulator Assembly Transposition bracket using spool insulators	CASE, Rogers	Transposition
		1952
U	2,623,094	December 23, 1952	Resiliently Mounted Spool Type Insulator Rubber bushing for mounting Case type & rack type spool insulators	MARKLEY, William F.	Rubber	Western Union Telegraph Co.
		1961
U	2,986,595	May 30, 1961	Post Type Insulator and Method of Making the Same Method of sealing the internal part of the insulator to protect its electrical resistance	FIERO, Carl D. COREY, Charles E.	Post Type	Lapp Insulator Co., Inc.
		1962
U	3,024,303	March 6, 1962	Glazed Insulator Which Comprises a Ceramic Body and a Primary Coat Under the Glaze Which has a Lower Coefficient of Thermal Expansion than the Ceramic Body Suspension insulator with compression glaze coating under outer glaze surface	SMOTHERS, William J. SELSING, Jorgen	Suspension	The Ohio Brass Co.
		1966
U	3,243,505	March 29, 1966	Insulator Having Semi-Conductive Layers to Increase the Capacitance Thereof Fog type suspension with conductive layers on top and bottom of disk	CLARK, Colin H. W.	Fog	Steatite and Porcelain Products, LTD.
		1984
U	4,465,900	August 14, 1984	High Voltage Glazed Porcelain Insulators Porcelain insulator and glaze designed specifically for DC service	SEIKE, Shoji MITSUMATSU, Yoshio	Porcelain	NGK Insulators, Ltd.
		1988
U	4,749,824	June 7, 1988	High Voltage Insulators Polymer suspension made of silicon elastomer	ORBECK, Tor	Polymer	Dow Corning Corp.
U	4,782,199	November 1, 1988	Insulators Having Improved Steep Wave Front Characteristics Suspension, head treated with special glaze to strengthen cap/cement	SEIKE, Shoji TOTOKI, Takao MIMA, Toshiyuki	Suspension	NGK Insulators, Ltd.
		1989
U	4,845,318	July 4, 1989	Composite Electrical Insulator and Method of Forming Same Polymer suspension with porcelain core	CLABBURN, Robin LOOMS, John	Polymer	Raychem Limited

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