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SELECT DISTINCT patent.*, YEAR(date) as year FROM patent LEFT JOIN category ON category.patent = patent.patent AND category.type = patent.type WHERE (category.class = '174') AND (category.subclass = '212') ORDER BY date ASC, patent, type

Total of 63 patents found where: Class is '174'; Subclass is '212';

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T / S Patent Date Description Patentee Category Assigned To
 1870
U 107,075 September 6, 1870 Improvement in Telegraph Insulators
Threaded screw top (external) for mounting in hole in crossarm or pole		 MCKEE, Samuel
 Thread  
 1871
U Specimen known 110,645 January 3, 1871 Improvement in Glass Telegraph Insulators
CD 1040 threaded, tapered glass insulator to screw into crossarm or pole		 GARITY, John
 Insulator  
 1892
U 482,297 September 6, 1892 Electric Insulator
Threaded externally with saddle groove and square hole		 CLARK, William H.
 Thread  
 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 562,528 June 23, 1896 Wire Holder
Odd wireholder with two fins or ears that hold the wire		 HAKANSSON, Louis M.
 Wireholder  
 1897
U Specimen known 590,806 September 28, 1897 Insulator
U-937, eave trough above crossarm 		LOCKE, Fred M.
 Insulator  
 1899
U Specimen known 633,173 September 19, 1899 Insulator
CD 121 and CD 143 with external projections to absorb mechanical shock - horizontal ridges		 WITHYCOMBE, Frederick H.
 Insulator 11/20 to Clement H. McLeod
U Specimen known 633,174 September 19, 1899 Insulator
CD 121 and CD 143 with external projections to absorb mechanical shock - spiral ridges		 WITHYCOMBE, Frederick H.
 Insulator 11/20 to Clement H. McLeod
U Specimen known 633,175 September 19, 1899 Insulator
CD 121 and CD 143 with external projections to absorb mechanical shock - projections		 WITHYCOMBE, Frederick H.
 Insulator 11/20 to Clement H. McLeod
U Specimen known 633,176 September 19, 1899 Insulator
CD 121 and CD 143 with external depressions to absorb mechanical shock		 WITHYCOMBE, Frederick H.
 Insulator 11/20 to Clement H. McLeod
 1902
U Specimen known 700,463 May 20, 1902 Insulator for Electric Circuits
CD 301, CD 321 & U-938 (Strengthening ribs skirt to petticoat)		 WALTHER, William J.
 Insulator  
 1904
U Specimen known 758,175 April 26, 1904 Insulator
CD 1038 tree hanger		 CUTTER, Scott C.
 Insulator  
U 771,334 October 4, 1904 Third Rail Insulator
U-shaped third rail insulator metal caps fitting over each part to support rails.		 STEWART, JR., Samuel B.
 Third Rail General Electric Co.
U 775,986 November 29, 1904 Insulator
miscellaneous with flared skirt to hold paraffin		 OAKMAN, Samuel
 Miscellaneous Luther A. Wright
 1905
U 797,050 August 15, 1905 Insulator
Insulator, split and threaded to screw into hole in crossarm to hold wire		 DUNSMORE, William W.
 Insulator  
U 801,196 October 3, 1905 Self-Locking Insulator
Self-tying slot top		 MATHIAS, Charles L.
 Self-tying Slot Top 1/2 to Frank Kennedy
 1908
U 884,641 April 14, 1908 Hanging Insulator
Suspension with multipart shells and cable clamp		 CLARK, Walter G.
 Suspension  
 1909
U 913,439 February 23, 1909 Disk Insulator
Electrose pintype insulator with multiple parts and skirts		 STEINBERGER, Louis
 Electrose  
U Specimen known 917,031 April 6, 1909 Insulator for High Tension transmission lines
Insulator with weakening grooves in top skirt		 EVELETH, Charles E.
 Insulator General Electric Co.
 1914
U 1,118,694 November 24, 1914 Disk Strain Insulator
Suspension made of Electrose like fishtail Hewlett		 STEINBERGER, Louis
 Suspension  
 1915
U 1,166,394 December 28, 1915 Spool Type Disk Strain Insulator
Suspension composed of ribbed spools made of Electrose		 STEINBERGER, Louis
 Electrose  
 1917
U 1,212,704 January 16, 1917 Disk Strain Insulator
Suspension or disk strain made of Electrose with corrugations top and bottom		 STEINBERGER, Louis
 Suspension  
U 1,212,706 January 16, 1917 Disk Strain Insulator
Suspension or disk strain made of Electrose with spring bar to allow slight vertical movement		 STEINBERGER, Louis
 Suspension  
U 1,223,909 April 24, 1917 Disk Strain Insulator
Suspension or disk strain made of Electrose with spiraling ridges on each side		 STEINBERGER, Louis
 Suspension  
 1921
U Specimen known 1,374,998 April 19, 1921 Insulator
Multipart porcelain insulator of Faradoid design (spelling for other patents: GILCHREST, George Irving)		 FORTESCUE, Charles Le G.
GILCHREST, George I.
 Multipart Westinghouse Electric & Mfg. Co.
 1923
U 1,447,359 March 6, 1923 Ventilated Line Insulator
Electrose pintype insulator with holes in the center to ventilate and reduce heat		 STEINBERGER, Louis
 Electrose  
 1924
U 1,484,051 February 19, 1924 Insulator
Cylindrical H-T ins, inner section to receive strain if outer is broken		 AUSTIN, Arthur O.
 Cylinder The Ohio Brass Co.
 1926
U 1,594,207 July 27, 1926 Insulator
Wireholder with lag screw and ring		 KYLE, William D.
 Wireholder Line Material Co.
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.
 1927
U 1,613,464 January 4, 1927 Reinforced Insulator
Wireholder with lag screw and or U-shaped metal bracket		 KYLE, William D.
 Wireholder Line Material Co.
U 1,622,648 March 29, 1927 Insulator
Suspension similar to Hewlett with uniform thickness of porcelain		 JACKSON, Ray P.
 Suspension Westinghouse Electric & Mfg. Co.
 1928
U 1,663,011 March 20, 1928 Line Conductor Insulator
Wireholder with lag screw and bolt attachment		 KYLE, William D.
 Wireholder Line Material Co.
U 1,684,066 September 11, 1928 Insulator
Suspension with metal and porcelain shaped to conform with electric field		 MINOR, Douglas F.
 Suspension Westinghouse Electric & Mfg. Co.
U 1,687,535 October 16, 1928 Reduction of Losses in Insulators, Pins, and Cross Arms
Carrier circuit insulator with specific diameter/pin ratio		 AFFEL, Herman A.
GREEN, Estill I.
 Carrier American Telephone & Telegraph Co.
U 1,694,415 December 11, 1928 Insulator
Under crossarm type (see 955,661)		 GORDON, Chester S.
 Under American Telephone & Telegraph Co.
 1929
U Specimen known 1,708,038 April 9, 1929 Low Loss Insulator
CD 176 (see June 1972 CJ p. 6)		 WILSON, Leon T.
 Insulator American Telephone & Telegraph Co.
U 1,716,123 June 4, 1929 Insulator
Multipart with external cement joints covered with tar for RFI		 GODDARD, Walter T.
 Multipart Locke Insulator Corp.
U Specimen known 1,721,657 July 23, 1929 Insulator
Tree insulator (porcelain) improved with ribs - strengthening (see 1,620,804)		 CUTTER, Scott C.
 Tree  
U 1,736,043 November 19, 1929 Insulator
Knob		 KYLE, William D.
 Knob Line Material Co.
 1930
U 1,742,628 January 7, 1930 High Tension Insulator
Fog type suspension & pin-type insulator with external petticoats (see 1,858,611) Patent was owned by Lapp Insulator Co.		 BARFOED, Svend
 Fog Type  
U Specimen known 1,760,983 June 3, 1930 Insulator
CD 194.5, CD 195.5 transposition		 GORDON, Chester S.
LOWE, James T.
 Insulator American Telephone & Telegraph Co.
U 1,768,948 July 1, 1930 High Voltage Insulator
Suspension insulator		 BAUM, Frank G.
 Suspension Westinghouse Electric & Mfg. Co.
 1932
U 1,858,611 May 17, 1932 High Tension Insulator
Fog type suspension by Lapp (see 1,742,628) Patent was owned by Lapp Insulator Co.		 BARFOED, Svend
 Fog Type  
 1934
U 1,944,383 January 23, 1934 Oil Bath Insulator
Oil type insulator using oil cup attached to edge of insulator and protective cover attached to prevent contamination from fog or rain		 WEILL, Robert
 Oil  
 1935
U Specimen known 1,994,282 March 12, 1935 Fog Type Insulator
Fog type suspension similar to oil reservoir types with inverted mating cup		 LUSIGNAN, JR., Joseph T.
 Fog Type The Ohio Brass Co.
U 1,998,549 April 23, 1935 Insulator Construction
Insulator that will withstand high compression and support the weight of a radio antenna		 LAPP, Grover W.
JENNER, Ralph L.
 Antenna Lapp Insulator Co., Inc.
 1936
U 2,056,813 October 6, 1936 Flux Distributing Insulator
Radio antenna strain insulator with metal ribs on the outside to control the electrostatic flux density		 VROOMAN, Edward C.
 Strain Locke Insulator Corp.
 1937
U Specimen known 2,084,866 June 22, 1937 High Voltage Insulator
U-796 styles and CD 221 Hi-Top design		 PLIMPTON, Bentley A.
 Insulator Locke Insulator Corp.
U Specimen known 2,088,433 July 27, 1937 Fog and Dust Insulator
U-816 series		 PLIMPTON, Bentley A.
 Insulator Locke Insulator Corp.
U 2,092,515 September 7, 1937 Insulator
Circular line spacer for telephone wires composed of a disk with holes for each wire		 JERVEY, William T.
 Spacer Bell Telephone Laboratories, Inc.
U 2,093,872 September 21, 1937 Radio Antenna Insulator for Airplanes
Antenna insulator for airplanes		 MCCOY, Robert L.
 Antenna Locke Insulator Corp.
 1939
D 114,352 April 18, 1939 Design for an Electric Insulator
Suspension insulator		 TAYLOR, John L.
 Suspension  
U 2,155,848 April 25, 1939 Insulator
Helical suspension & helical post type		 TAYLOR, John J.
 Helical The Ohio Brass Co.
U 2,162,288 June 13, 1939 Insulator
Suspension insulator with stepped rings to allow washing by rain and greater leakage length		 TAYLOR, John J.
 Suspension  
 1941
U Specimen known 2,266,400 December 16, 1941 Insulator
CD 216		 REED, Frederick F.
 Insulator  
 1942
U Specimen known 2,304,483 December 8, 1942 Electrical Insulator
Rubber pin type insulator		 SMITH, Donald H.
WHEELER, Herbert H.
 Rubber Western Union Telegraph Co.
 1950
U 2,533,621 December 12, 1950 Electric Insulator
Spool type electric fence insulator with ribs and flat area for metal bracket to attach.		 PRATT, Elbert H.
CHRISTIE, Ralph C.
 Electric Fence  
 1951
U 2,576,723 November 27, 1951 Electric Insulator Having Potential Drop Controlling Means
RFI design using two conductive coatings of different temperature expansion		 PERRINS, George
 RFI Bullers Limited
 1957
U 2,776,332 January 1, 1957 Self-Cleaning Outdoor High Tension Insulators
Spiral or helical side petticoats that are washed by rain		 VON CRON, Hans
 Spiral Siemens-Schuckertwerke Aktiengesellschaft
 1959
U 2,895,260 July 21, 1959 Method of Treating a Glass Insulator
Method of making a toughened glass insulator		 JELLYMAN, Philip E.
DICKINSON, George A.
MACINTOSH, Hamish F.
 Glass Pilkington Brothers Ltd.
 1964
U 3,141,063 July 14, 1964 Toughened Glass, Pin Type Insulator
Glass tempering method		 EDWARDS, Derrik R.
 Glass Pilkington Brothers Limited
 1983
U 4,406,918 September 27, 1983 Tempered Glass Dielectric Member for an Electrical Insulator and an Insulator Using Said Member
Glass tempering method		 SABY, Charles
 Glass Ceraver
 1988
U 4,749,824 June 7, 1988 High Voltage Insulators
Polymer suspension made of silicon elastomer		 ORBECK, Tor
 Polymer Dow Corning Corp.

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