| 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 = '57') AND (category.subclass = '215') ORDER BY date ASC, patent, type |
Total of 2 patents found where: Class is '57'; Subclass is '215';
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 |
| 1872 | ||||||
| U | 129,676 | July 23, 1872 | Improvement in Lightning Rods Lightning rod made of several ropes of twisted angular copper wire twisted around an iron core to reduce cost |
MUNSON, David |
Lightning Rod | |
| 1877 | ||||||
| U | 190,391 | May 1, 1877 | Improvement in Lightning Rods Lightning rod made of a central galvanized iron rod twisted around with several galvanized rods all soldered together then intertwined with strips of copper that are soldered to the core |
VAN LOON, Nicholas |
Lightning Rod | |
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