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 (assigned_to = 'Essex Co.') ORDER BY date ASC, patent, type

Total of 2 patents found where: Assigned To is 'Essex Co.';

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
 1908
U 908,136 December 29, 1908 Third Rail Insulator
Third rail insulator (Ohio Brass)		 RANDOLPH, Leonard M.
 Third Rail Essex Co.
 1909
U 922,951 May 25, 1909 Third Rail Insulator
Conical shaped third rail insulator.		 RANDOLPH, Leonard M.
 Third Rail Essex Co.

Total of 0.01 seconds