Search the Insulator Patent Reference Library:

Build your search criteria. The patent must match all the values specified.
Select patent types: Utility   Design   Reissue
Patent number:
Date:
Year between: and
Patentee starting with:
City:
State:
Assigned To starting with:
Description containing:
Category:
Class:    Subclass:
Click Search when complete:
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 = '31.5') ORDER BY date ASC, patent, type

Total of 4 patents found where: Class is '174'; Subclass is '31.5';

View a patent by clicking on the patent number. You can sort by any of the columns by clicking on the column name.

T / S Patent Date Description Patentee Category Assigned To
 1891
U 461,631 October 20, 1891 Insulating Support for Electric Conductors
Oil insulator		 HEWETT, Robert J.
 Oil  
 1894
U Specimen known 524,659 August 14, 1894 Insulator
Oil cup with means to support the cup from the insulator (see 517,634)		 WINSLOW, George H.
 Oil  
 1904
U 771,297 October 4, 1904 Insulator
Oil reservoir for transformer insulator		 CHESNEY, Cummings C.
 Oil Stanley Electric Mfg. Co.
 1916
U Specimen known 1,190,766 July 11, 1916 Insulating Support
Battery support insulator		 HUBBARD, Albert S.
 Battery Gould Storage Battery Co.

Total of 0.00 seconds