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 = '307') AND (category.subclass = '12') ORDER BY date ASC, patent, type |
Total of 1 patents found where: Class is '307'; Subclass is '12';
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T / S | Patent | Date | Description | Patentee | Category | Assigned To |
1884 | ||||||
U | 304,084 | August 26, 1884 | Device for Protection Electric Light Systems from Lightning Method of protecting electric generators from lightning by allowing the charge to discharge to the earth ground |
EDISON, Thomas A. |
Lightning Arrestor |
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