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 = '428') AND (category.subclass = '668') ORDER BY type ASC, date, patent |
Total of 1 patents found where: Class is '428'; Subclass is '668';
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T / S | Patent | Date | Description | Patentee | Category | Assigned To |
1868 | ||||||
U | 77,729 | May 12, 1868 | Improvement in Lightning Rods Lightning rod made of wire or iron with a sheet of copper wrapped several times around it |
HALL, William |
Lightning Rod |
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