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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 = '206') ORDER BY date ASC, patent, type

Total of 23 patents found where: Class is '174'; Subclass is '206';

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T / S Patent Date Description Patentee Category Assigned To
 1871
U 115,521 May 30, 1871 Improvement in Insulators for Telegraph Wires
Threadless insulator with metal thimble cemented in pinhole		 READ, Horatio
 Thimble 1/2 to B. B. Hagerty
 1872
U 124,200 March 5, 1872 Improvement in Telegraph Insulators
Earthenware insulator soaked in mix of wax and rosin then in petroleum		 FARMER, Moses G.
 Earthenware  
 1878
U 201,544 March 19, 1878 Improvement in Insulators for Telegraph Wires
Threads of segmented internal threads to match segmented pin		 MATTHEWMAN, Joseph
 Thread  
 1883
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.
 1884
U 297,101 April 22, 1884 Insulator for Telegraph Wires
Pin hole shaped to receive a keyed pin (advertisement eBay 4-2001)		 BALDWIN, Luther C.
THURSTON, John C.
 Pin  
 1885
U 317,479 May 5, 1885 Insulator for Electric Wires
Insulator with corrugations (vertical) inside skirt		 WRIGHT, William H.
 Insulator  
U 321,646 July 7, 1885 Electric Wire Insulator
Pin with spars to fit in threaded pin hole		 SCHOONMAKER, Edward T.
 Pin 1/2 to John E. Smith
 1886
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.
 1896
U Specimen known 573,092 December 15, 1896 Insulator
Insulator of two materials combined		 LOCKE, Fred M.
 Insulator  
 1897
U 582,396 May 11, 1897 Insulator
Self-tying slot top		 SCHNEE, William G.
 Self-tying Slot Top 1/2 to John R. Dixon
 1904
U 776,789 December 6, 1904 Insulator
Skirts are horizontal		 LOCKE, Fred M.
 Skirt  
U 778,005 December 20, 1904 Electric Insulator
Pin hole with groove inside of pin hole & on pin		 BOOKER, Charles
 Pin  
 1906
U 822,211 May 29, 1906 Insulator
Skirt (bottom) upper end nearly flat with porcelain cap resting on same		 LOCKE, Fred M.
 Skirt  
 1909
U 937,140 October 19, 1909 Non-detachable Insulator
Pin permanently fixed to the insulator via slotted pinhole		 BARTLETT, Harry
MACCALLUM, Alexander P.
 Pin  
 1919
U 1,291,713 January 21, 1919 Separable Part Insulator
Multipart (& suspension) with cemented, threaded metal shells screwed together		 AUSTIN, Arthur O.
 Multipart The Ohio Brass Co.
 1922
U 1,406,953 February 14, 1922 Strain Insulator
Suspension with special slotted cap and pin to improve cement joint		 GODDARD, Walter T.
 Suspension Locke Insulator Corp.
 1923
U 1,468,044 September 18, 1923 Line Insulator
Metal thimble in Electrose pintype insulator and internal cavity to cool insulator		 STEINBERGER, Louis
 Electrose  
 1928
U 1,663,421 March 20, 1928 Line Breaker
Breaker insulator similar to guy strain		 STUBBINGS, Edwin L.
 Breaker  
 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.
 1935
U 1,997,688 April 16, 1935 Insulator
RFI: coat crown with copper glaze to prevent radio interference		 HUNT, Marsden H.
BARROW, George M.
 RFI Westinghouse Electric & Mfg. Co.
 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.
 1960
U 2,947,802 August 2, 1960 Insulator with Cap in Socket
Pin covered with plastic cap to more securely hold the insulator on the pin		 WORTMANN, Adolf
 Pin  

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