| 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 = '420') ORDER BY date ASC, patent, type |
Total of 2 patents found where: Class is '420';
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 |
| 1850 | ||||||
| U | 7,008 | January 8, 1850 | Improvement in Alloys for Points of Lightning Rods Alloy composed of tin, antimony, bismuth, silver, platinum, and silex |
SPRATT, James |
Lightning Rod Point | |
| 1950 | ||||||
| U | 2,513,958 | July 4, 1950 | Electric Insulating Bushing and Glass Therefore Glass capacitor bushing and improved seal with metal parts |
OMLEY, Herbert A. |
Bushing | General Electric Co. |
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