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 WHERE (category = 'Triangular') ORDER BY date ASC, patent, type

Total of 1 patents found where: Category is 'Triangular';

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
 1871
U 121,368 November 28, 1871 Improvement in Telegraph Insulators
Triangular insulator to reduce surface contact of tie wire		 HOLLEY, Minard Y.
 Triangular  

Total of 0.00 seconds