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SELECT DISTINCT patent.*, YEAR(date) as year FROM patent WHERE (category = 'Insulator') ORDER BY date ASC, patent, type

Total of 131 patents found where: Category is 'Insulator';

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T / S Patent Date Description Patentee Category Assigned To
 1851
U Specimen known 8,438 October 14, 1851 Improvement in Insulators for Telegraphs
CD 1012 & CD 1014, slotted glass tube mounted in a wooden bracket
YANDELL, John
Insulator  
 1867
U Specimen known 64,654 May 14, 1867 Improvement in Insulators
CD 732.2, threadless insulator with enlarged chamber for slotted pin (CJ 6-93-12)
FLOYD, George
Insulator  
 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  
U Specimen known 114,924 May 16, 1871 Improvement in Telegraph Insulators
CD 158.1 with metal ring with fingers to hold wire
CHESTER, Stephen
Insulator  
 1872
U Specimen known 123,878 February 20, 1872 Improvement in Telegraph Insulators
CD 141.9, four projections to reduce surface contact
EMMINGER, David R. P.
Insulator  
U 133,595 December 3, 1872 Improvement in Insulation of Telegraph lines
Insulator suspended from sub cross-bar (CJ 9-85-14)
ROGERS, James H.
Insulator  
 1874
U Specimen known 154,451 August 25, 1874 Improvement in Telegraph Insulators
CD 109.5 self-tying with three projections on top (similar to Harloe)
BROOKE, Homer
Insulator  
 1877
U Specimen known 187,183 February 6, 1877 Improvement in Telegraph Insulators
CD 130.2, wire groove composed of a series of projections
SEILER, Paul
Insulator 1/2 to Joseph Herz
U Specimen known 194,220 August 14, 1877 Improvement in Lightning Rods and Insulators
CD 317 lightning rod insulator and spiral lightning rod
CHAMBERS, Josephus C.
Insulator  
 1879
U 216,138 June 3, 1879 Improvement in Telegraph Insulators
Insulator suspended under crossarm by screw to hold wireholder
BLOOMFIELD, John H.
Insulator  
 1882
U 252,857 January 24, 1882 Insulator for Telegraph Wires
Insulators strung on wires to separate groups of wires in a tube
GORE, Charles L.
Insulator 1/4 to John Townsend
 1883
U Specimen known 276,839 May 1, 1883 Insulator for Telegraph Wires
CD 110.5 & CD 110.6 spiral groove crown & clamp for line wire
LEWIS, Joseph Slater
Insulator  
U 281,452 July 17, 1883 Telegraph Insulator
Insulator with side bracket (see OBX March 1973, p. 43)
CHAPMAN, Thomas L.
Insulator  
U Specimen known 286,801 October 16, 1883 Insulator
CD 109, CD 135, diamond shaped wire groove
FISKE, Bradley
MOTT, Samuel
Insulator  
U Specimen known 288,360 November 13, 1883 Telegraph Insulator
Double petticoat design for style similar to CD 162. An annual recess to receive paraffin to form a broad band of surface protected from moisture
OAKMAN, Samuel
Insulator The American Insulator Co.
U Specimen known 289,449 December 4, 1883 Insulator
Transposition style but not intended for transposition (CD 199 & U-197)
ROUSSEAU, Necter
Insulator 1/2 to James W. Brennan
U Specimen known 290,922 December 25, 1883 Insulator for Electrical Conductors
CD 110.5 & CD 110.6 spiral crown with opposing internal threads & wire clamp
POPE, Frank L.
Insulator  
 1885
U 316,469 April 28, 1885 Electric Wire Insulator
Insulators and supporting rail
LOCKE, Joseph
BOWKER, William
Insulator Themselves and Robert Williams
U Specimen known 316,812 April 28, 1885 Telegraph Insulator
CD 119, self-tying via projections (347,635 more appropriate)
O'BRIEN, John
Insulator William Brookfield
U 317,479 May 5, 1885 Insulator for Electric Wires
Insulator with corrugations (vertical) inside skirt
WRIGHT, William H.
Insulator  
U 324,957 August 25, 1885 Telegraph Insulator
Insulator (glass) screwed into crossarm
PUTNAM, Jacob D.
Insulator  
 1886
U Specimen known 347,635 August 17, 1886 Telegraph Insulator
CD 119, self-tying with fingers (should use instead of 316,812)
O'BRIEN, John
Insulator William Brookfield
U Specimen known 353,120 November 23, 1886 Insulator
CD 187, U-81 & U-82, duplex insulator for underside of crossarm
BROWN, Robert G.
Insulator E. S. Greeley & Co.
 1889
U Specimen known 402,752 May 7, 1889 Insulator
CD 289.9 (CD 1182), under crossarm type with triple petticoat
LOCKE, Fred M.
LAPP, John
Insulator  
 1890
U Specimen known 427,296 May 6, 1890 Insulator
CD 141.8 and CD 1037, self-tying with tapered pin hole & clamping flange
BUZBY, Joseph F.
Insulator  
U Specimen known 430,296 June 17, 1890 Insulator
CD 257, CD 259, CD 263, dove-tail ears on crown - helmet. Patent is also found on New Lexington porcelain insulators M-3890 and M-4325A.
OAKMAN, Samuel
Insulator  
U Specimen known 434,879 August 19, 1890 Electric Insulator
CD 144.5 and CD 260, ridges around inner surface of skirt
OAKMAN, Samuel
Insulator  
U Specimen known 443,187 December 23, 1890 Electric Insulator
CD 144, ridges around outside of skirt to break water film
BAIN, Foree
Insulator  
 1891
U 445,969 February 10, 1891 Electric Insulator
Round insulator mounted on top of crossarm with two screws and surrounded with a rubber tube. Conductor is supported on top and secured with a metal clip.
BRANCH, James R.
Insulator  
U Specimen known 451,950 May 12, 1891 Electric Insulator
CD 262, CD 263, CD 264, eyes for tie wire
OAKMAN, Samuel
Insulator  
 1892
U Specimen known 476,813 June 14, 1892 Porcelain Insulator
U-141, pin type insulator with cemented metal thimble. Patent was owned by Pass & Seymour.
PASS, James
SEYMOUR, Albert P.
Insulator  
U 481,132 August 16, 1892 Insulator
Device and insulator for suspending wires using one or more insulators encased in a metal sphere with wire suspended by means of a bolt or hook set in the center of the two halves of the spherical insulator (see 286,681)
BOWEN, William J.
Insulator William Hubbard
U Specimen known 484,209 October 11, 1892 Insulator
CD 285 ""Edison"" - rainshed type for under crossarm
LOCKE, Fred M.
Insulator  
 1893
U Specimen known 490,560 January 24, 1893 Insulator
Self-tying screw top
HAUTY, Auguste J.
Insulator 1/3 to John Burke
U 496,081 April 25, 1893 Insulator
Insulator mounted in a slot in the crossarm and secured with a hinged latching cover
WRIGHT, Joseph F.
Insulator  
U Specimen known 504,059 August 29, 1893 Insulator
CD 141.6, bail type clamping lever to hold line wire
BLACKBURN, George W.
Insulator  
 1894
U 517,634 April 3, 1894 Pin for Insulators
Pin for use with oil cup, CD 244 (see 524,659)
WINSLOW, George H.
Insulator  
U Specimen known 520,367 May 22, 1894 Insulator
Transposition insulator CD 204 & U-192A
LOCKE, Fred M.
Insulator 1/2 to G. Paddock & W. Page
 1895
U Specimen known 545,819 September 3, 1895 Electric Insulator
CD 268, hole through crown for tie wire
ROTHENBERGER, Daniel M.
Insulator 2/3 to C. Inglis & E. Reilly
 1896
U Specimen known 557,881 April 7, 1896 Insulator
CD 134.6 bail wire system double-groove insulator (Cosner specimen)
RAPPLEYE, Hannibal W.
Insulator  
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 572,438 December 1, 1896 Cell or Box for Electric Batteries
(Gould battery rests: CD 20, CD 25, CD 50, CD 51) also patents England: 10,463 (5-30-1894); Germany: 85,828 (3-26-1895)
MOFFAT, John Miles
Insulator  
U Specimen known 573,092 December 15, 1896 Insulator
Insulator of two materials combined
LOCKE, Fred M.
Insulator  
 1897
U Specimen known 590,806 September 28, 1897 Insulator
U-937, eave trough above crossarm
LOCKE, Fred M.
Insulator  
 1898
U Specimen known 600,475 March 8, 1898 Electrical Insulator and Method of Making Same
Multiple thin porcelain shells fused together with glaze, ""glaze-filling"" method, U-928 & U-928A. (see patent 601,195) (see patent gb1898-0006235) Patent was owned by the R. Thomas & Sons Co.
BOCH, John W.
Insulator  
U Specimen known 601,195 March 22, 1898 High Potential Insulator
Inner skirt extending down to the crossarm or through the crossarm to prevent arcing from the petticoat edges to the pin, U-944. (see patent 600,475) (see patent gb1898-0006235)
BOCH, John W.
Insulator The R. Thomas & Sons Co.
U Specimen known 605,109 June 7, 1898 Insulator
Insulator with sleeve to protect pin
LOCKE, Fred M.
Insulator  
U Specimen known 605,256 June 7, 1898 Insulator
CD 288, U-938 & U-945
MERSHON, Ralph D.
Insulator  
 1899
U Specimen known 633,173 September 19, 1899 Insulator
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 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 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 143 with external depressions to absorb mechanical Shock
WITHYCOMBE, Frederick H.
Insulator 11/20 to Clement H. McLeod
U Specimen known 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  
U 637,282 November 21, 1899 Electric Insulator
Tube of asbestos to lead conductor through a wall is made water tight (see 608,906) (see 615,896)
POCHE, Joseph Arthur
Insulator  
 1900
U Specimen known 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.
U Specimen known 664,432 December 25, 1900 Insulator
CD 207? (see 726,846)
RENAULT, Edward
Insulator  
 1901
U 666,586 January 22, 1901 Insulator
Insulator & crossarm (glass) reinforced with embedded metal wires
WOOLBERT, Henry W.
Insulator  
U Specimen known 676,881 June 25, 1901 Self-Locking Insulator and Pin
U-376, U-376A, U-376B, U-376C, U-376D
ETHERIDGE, Harry
Insulator  
U Specimen known 686,609 November 12, 1901 Insulating Support for Electric Wires
CD 309.5, Telluride ""Type B"" under-hung combined insulators
HEMINGRAY, Ralph G.
Insulator  
U 689,171 December 17, 1901 Insulator
Insulators (2) with one pinhole
DUFFY, John F.
HERSHEY, Henry B.
Insulator  
U 689,218 December 17, 1901 Electrical Insulator
Pin sleeve (see design 34,211 for U-966)
PARKS, Albert F.
Insulator Lewis Stillwell
 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  
U Specimen known 701,847 June 10, 1902 Insulator
CD 317.8, CD 313 & CD 313.1 stacking glass sections
CONVERSE, Vernon G.
Insulator Hemingray ????
 1903
U Specimen known 724,848 April 7, 1903 Insulator
CD 159, wire groove with flat surface for line wire
GREGORY, Ferdinand W.
Insulator  
U Specimen known 726,846 May 5, 1903 Insulator for Electric Wires
U-181 & CD 207 (sim) self-tying screw top (see 664,432)
BELL, Joseph R.
Insulator  
U Specimen known 728,805 May 19, 1903 Insulator
M-2335, M-2785, M-2795 & M-2796 with eave drain & spout (see 664,301)
LOCKE, Fred M.
Insulator  
U Specimen known 735,212 August 4, 1903 Insulator
CD 317.7, insulator with glass sleeve (CD 314)
CONVERSE, Vernon G.
Insulator  
U Specimen known 744,631 November 17, 1903 Insulator
CD 139 combination safety and CD 181.5
SCHOENTHALER, Edward F.
Insulator 2/3 to W. Parker & J. Finn
U Specimen known 745,284 November 24, 1903 Insulator
Glazewelding (Boch variation) shells fused together to leave air space, U-926A
LOCKE, Fred M.
Insulator  
 1904
U Specimen known 758,175 April 26, 1904 Insulator
CD 1038 tree hanger
CUTTER, Scott C.
Insulator  
U 761,102 May 31, 1904 Insulator
Insulator for carrying heavy cables composed of cap over the top to surround the conductor to prevent sparking and electrical leakage
RANDOLPH, Leonard M.
Insulator  
U Specimen known 761,760 June 7, 1904 Insulator
Multipart lily shell design (M-3740)
CHESNEY, Cummings C.
Insulator Stanley Electric Mfg. Co.
 1905
U 782,000 February 7, 1905 Glass Mold
Mold specially designed to make the Buzby insulator CD 141.8
BUZBY, Joseph F.
Insulator  
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 Specimen known 798,235 August 29, 1905 Insulator
CD 141.7
TWIGGS, William R.
Insulator  
U 799,726 September 19, 1905 Insulator
Insulator, split and threaded to screw into hole in crossarm to hold wire
FOREMAN, Ernest Jay
Insulator  
 1906
U 823,912 June 19, 1906 Insulator
Cylindrical insulator with hole for line wire and hole for tie wire mounted in hole in crossarm and secured with cover over top of crossarm
BIELE, August
Insulator  
U Specimen known 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 843,739 February 12, 1907 Electric Insulator
Insulator used on trolley arms to support carrier wire that fits inside a metal case in the support crossarm
FEIGERT, Frederick A.
Insulator  
U 851,222 April 23, 1907 Insulator Clamp
Clamping device to hold conductor cable in crown groove (used on M-3740)
CLARK, Walter G.
Insulator The Clark Electric & Mfg. Co.
U Specimen known 852,730 May 7, 1907 Insulator
U-957, broad skirt extending to crossarm with small threaded porcelain thimble
LOCKE, Fred M.
Insulator  
U Specimen known 867,901 October 8, 1907 Insulator
CD 110, CD 147 & CD 150 spiral extension above wire groove to facilitate removing or installing the insulator without the need to remove the tie-wire.
BARCLAY, John C.
Insulator  
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 Specimen known 881,967 March 17, 1908 Electric Insulator
U-185
SLUSSER, Charles R.
Insulator  
U Specimen known 882,803 March 24, 1908 Insulator
CD 211
STORROR, Leonard W.
Insulator  
U Specimen known 888,616 May 26, 1908 Insulator
CD 109.7 self-tying with fingers
JOHNSON, Chauncey C.
Insulator 45/100 to John Watson
U 893,285 July 14, 1908 Electric Cable Insulator
Terminal insulator providing a tight seal between conductor running down through the center of the insulator
TOMPKINS, Edward M.
Insulator  
U Specimen known 894,616 July 28, 1908 Insulator and Wire Clamp
U-401 and U-401A, insulator & wire clamp
FAY, John L.
Insulator  
U Specimen known 905,141 December 1, 1908 Insulator
Strain similar to CD 1130, CD 1131, CD 1138, CD 1140, CD 1142 but with intersecting grooves
BOGUE, Lawrence L.
Insulator  
 1909
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.
U 918,339 April 13, 1909 System for Insulation for High voltage Electric Conductors
Insulator multiples
LOCKE, Fred M.
Insulator  
U Specimen known 929,878 August 3, 1909 Insulator
U-183
RANSON, Joseph W.
Insulator  
U 942,086 December 7, 1909 Support and Insulator
Complicated insulator made of two plates of glass secured in a wooden box
LINDSAY, Edward F.
Insulator  
 1910
U Specimen known 971,785 October 4, 1910 Tree Insulator
U-187
PIERCE, Alfred L.
Insulator 1/2 to Spalding K. Long
U 972,994 October 18, 1910 Insulator
Insulator base curve to fit flush with matching curved top of crossarm
CAMPBELL, John H.
Insulator  
 1912
U 1,022,993 April 9, 1912 Insulator
Insulator with external threads to be screwed into metal shield and entire unit screwed into underside of the crossarm
WILLIS, George W.
Insulator  
 1914
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 Specimen known 1,107,111 August 11, 1914 Insulator
U-186
PURKEY, Benjamin S.
Insulator  
 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 Specimen known 1,140,050 May 18, 1915 Insulator
U-189 & U-189A, CD 175.5 The insulator was designed to support the power line to street lights. Only pieces of a specimen have been found. (see 1,101,802)
MANWARING, Robert A.
HESSEL, James T.
Insulator  
 1916
U 1,174,287 March 7, 1916 Insulator Support
Pin - hollow metal & bolted to crossarm for CD 257
ROSENFELD, Mortimer C.
Insulator  
 1917
U 1,215,883 February 13, 1917 Crosstree for Telegraph Poles
Large blocks of wood securing in between the blocks halves of a stone or porcelain insulator mounted on a crossarm to secure the wire
SIMPSON, John Stewart
Insulator  
U Specimen known 1,229,272 June 12, 1917 Insulator
CD 210 with top saddle groove (see 954,350)
IRWIN, John J.
Insulator  
U 1,230,521 June 19, 1917 Bracket
Tree insulator similar to the Cutter CD 1038 except with diagonal slot to secure wire, two holes for nails and two holes for tying to tree limbs
ROSS, George
Insulator  
 1919
U Specimen known 1,305,168 May 27, 1919 Insulator
U-124A/B, U-182A/B self-tying screw top similar to Prenzel patent 315,660
ROBERTS, Omer L.
Insulator  
 1926
U 1,574,964 March 2, 1926 Insulation Equipment
Special insulator design for bus bar and equipment support (see 1,274,555 and 1,663,007)
GETTS, Frank E.
Insulator Electrical Engineers Equipment Co.
 1927
U Specimen known 1,620,804 March 15, 1927 Insulator
Tree insulator bracket for CD 1038 (see 1,721,657)
CUTTER, Scott C.
Insulator  
 1928
U Specimen known 1,687,495 October 16, 1928 Insulator
Transposition (1-piece) for telephone line shaped like CD 194.5, CD 195.5
GORDON, Chester S.
LOWE, James T.
Insulator American Telephone & Telegraph Co.
 1929
U Specimen known 1,701,562 February 12, 1929 Insulator
CD 122.4, CD 128, CD 142, CD 194.5, CD 195.5 with threads inside skirt
GORDON, Chester S.
Insulator American Telephone & Telegraph Co.
U 1,702,235 February 12, 1929 System of Line Insulation and Insulators Therefor
Odd Electrose insulator
STEINBERGER, Louis
Insulator  
U Specimen known 1,703,853 February 26, 1929 Dry-Spot Insulator
CD 182, U-173, U-174 & U-175 dry-spot
GOULD, Rufus
Insulator 1/2 to Postal Telegraph Cable Co.
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.
 1930
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.
 1931
U 1,819,302 August 18, 1931 Oil and Air Break Pothead Disconnect
Pothead disconnect
RAH, Joseph
Insulator G. & W. Electric Specialty Co.
 1934
U Specimen known 1,955,609 April 17, 1934 Insulator
U-856A fogbowl
ROWLAND, Davidge H.
Insulator 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 Specimen known 2,089,791 August 10, 1937 Method of Making Electrical Insulators
CD 240.2, method of making insulator described in 2,191,152
HAMMEL, Victor F.
Insulator  
U Specimen known 2,099,540 November 16, 1937 Insulator Shield
Metal skirt on CD 154
SMITH, Donald H.
Insulator Western Union Telegraph Co.
 1939
U 2,142,422 January 3, 1939 Insulator and Method of Manufacturing the Same
Method of making station post insulators with hollow cavity and filling cavity with dry gas
TAYLOR, John J.
Insulator The Ohio Brass Co.
U Specimen known 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.
 1940
U Specimen known 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 Specimen known 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 2,234,391 March 11, 1941 Method of Manufacturing Electric Insulators
Method of making station post insulators with metal caps
TAYLOR, John J.
Insulator The Ohio Brass Co.
U Specimen known 2,266,400 December 16, 1941 Insulator
CD 216
REED, Frederick F.
Insulator  
 1942
U 2,278,330 March 31, 1942 Multipost Line Insulator
Two post insulators joined together with elongated metal bottom cap
MEYER, Edwin M.
Insulator Porcelain Products, Inc.
 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
U Specimen known 2,336,864 December 14, 1943 Apparatus For Forming Insulators
CD 1030: Wireholder made of glass, press for making the design
HOLMES, Minot K.
Insulator Owens-Illinois Glass Co.
 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.
 1956
U Specimen known 2,734,098 February 7, 1956 Transposition Insulators
CD 203.2 transposition - rainshed of elastic material between conductors
BONNESEN, Elmer J.
Insulator American Telephone & Telegraph Co.

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