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:
Year between: and
Patentee starting with:
Assigned To starting with:
Description containing:
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 = '40') AND (category.subclass = '617') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '40'; Subclass is '617';

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
U Specimen known 1,381,594 June 14, 1921 Strain-Insulator Sign
Combination strain insulator and sign to indicate voltage, etc. Car-Stop They were made by the American Porcelain Co.
SAUEREISEN, Christian F.

Total of 0.00 seconds