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 = 'Trolley') ORDER BY assigned_to ASC, date, patent, type

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

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
 Charles Fritts
U 1,185,700 June 6, 1916 Insulator for Trolley Wires
Trolley hanger insulator
MOSS, Benton C.
Trolley 1/2 to Charles Fritts

Total of 0.03 seconds