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 = '403') AND (category.subclass = '338') ORDER BY date ASC, patent, type

Total of 2 patents found where: Class is '403'; Subclass is '338';

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 74,406 February 11, 1868 Improvement in Lightning Rods
Lightning rod made with twists and folds
Lightning Rod  
U 1,393,330 October 11, 1921 Electrical Insulator
Links for Hewlett suspension disks (see 1,110,934)
WELCH, Walter J.
TRACY, Atlee H.
Suspension H. M. Byllesby & Co.

Total of 0.01 seconds