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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 = '442') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '442';

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T / S Patent Date Description Patentee Category Assigned To
 1888
U 386,925 July 31, 1888 Electrical Non-Conductor
Non-conducting composition material composed of mica and glue used to coat cheese cloth and made in thin sheets, which are then coated with shellac to repel moisture		 LEE, Charles Tennant
WAITE, Charles N.
 Composition 1/2 to The Gould & Watson Co.

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