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 LEFT JOIN name ON name.patent = patent.patent AND name.type = patent.type WHERE (last_name = 'KEITHLEY') AND (first_name = 'Herbert R.') ORDER BY date ASC, patent, type

Total of 1 patents found where: Last Name is 'KEITHLEY'; First Name is 'Herbert R.';

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
 1890
U 433,409 July 29, 1890 Electric Railway
Electric railway with third rail insulated with glass insulators.		 KEITHLEY, Herbert R.
 Third Rail  

Total of 0.00 seconds