| 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 = '256') AND (category.subclass = '7') ORDER BY description ASC, date, patent, type |
Total of 3 patents found where: Class is '256'; Subclass is '7';
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 |
| 1857 | ||||||
| U | 18,963 | December 29, 1857 | Improved Device for Attaching Lightning Rods Lightning rod made of corrugated copper sheets and attached with iron spikes |
ELLIOTT, J. B. |
Lightning Rod | |
| 1883 | ||||||
| U | 282,449 | July 31, 1883 | Lightning Rod Lightning rod made of twisted copper or iron rods with points along the length exactly like barbed wire |
DODGE, Thomas D. |
Lightning Rod | |
| 1877 | ||||||
| U | 189,286 | April 3, 1877 | Improvement in Lightning Rods Lightning rod of twisted sheet metal fitted with a serrated strip |
VERMILYA, Leland D. |
Lightning Rod | 1/2 to Henry Webbert |
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