Search the Insulator Patent Reference Library

Search the Insulator Patent Reference Library:

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 = '257') ORDER BY date ASC, patent, type

Total of 3 patents found where: Class is '257';

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
		1878
U	208,487	October 1, 1878	Bottle Stopper Bottle stopper	OAKMAN, Samuel	Bottle
		1894
U	515,779	March 6, 1894	Strain Insulator Strain type	LUSCOMB, Henry H.	Strain	The Johns Pratt Co.
		1920
U	1,335,801	April 6, 1920	Insulator Electrose strain (Brown p. 69)	STEINBERGER, Louis	Electrose

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