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 = '81') ORDER BY patent ASC, type |
Total of 2 patents found where: Class is '81';
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T / S | Patent | Date | Description | Patentee | Category | Assigned To |
1903 | ||||||
U | 735,429 | August 4, 1903 | Insulator Machine Plunger for press |
WATERS, James |
Plunger | |
1952 | ||||||
U | 2,582,442 | January 15, 1952 | Power Wrench Mechanism for Ceramic Filter Presses A motorized wrench to tighten the screw on the leaves of a clay filter press that can be moved from one press to the other. |
LAPP, Grover W. |
Filter Press | Lapp Insulator Co., Inc. |
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