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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 = '425') AND (category.subclass = '457') ORDER BY date ASC, patent, type

Total of 7 patents found where: Class is '425'; Subclass is '457';

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T / S Patent Date Description Patentee Category Assigned To
 1904
U 774,765 November 15, 1904 Art and Method of Manufacturing Earthenware Insulators
Earthenware, manufacture of		 LOCKE, Fred M.
 Earthenware  
 1905
U 790,214 May 16, 1905 Method of Manufacturing High Potential Earthenware Insulators
Earthenware, manufacture of hi-potential insulators		 LOCKE, Fred M.
 Earthenware  
 1916
U 1,204,745 November 14, 1916 Pressure Die for Insulator Pressing Molds
Insulator threading press		 DAHL-JENSEN, Jens Peter
 Press  
 1922
U Specimen known 1,407,550 February 21, 1922 Method and Machine for Forming Impressions in Plastic Articles
Threading porcelain by gyrating the thread mandrel (""wobbler"" method)		 LAPP, John
 Thread  
 1929
U 1,719,989 July 9, 1929 Method of and Apparatus for Assembling Insulators
Method of assembling the shells, holding downward pressure, and vibrating to settle cement around the shells to eliminate air		 MOORE, JR., Stewart L.
 Manufacturing Locke Insulator Corp.
 1933
U 1,929,737 October 10, 1933 Apparatus for Molding Insulators
Die to hot press to form an insulator for street lights with one part of the mold rotating and a stationary part to form petticoats with integral lugs (see 2,007,567)		 FISCHER, Eugene H.
 Manufacturing The Harford Faience Co.
 1937
U 2,068,941 January 26, 1937 Process and Apparatus for Manufacturing Insulators
Plunger to first form the pinhole in a porcelain insulator by first plunging a pinhole without threads then form the threads		 BOVARD, Floyd G.
 Press The Ohio Brass Co.

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