| 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 = '403') AND (category.subclass = '307') ORDER BY specimen ASC, date, patent, type |
Total of 3 patents found where: Class is '403'; Subclass is '307';
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 |
| 1879 | ||||||
| U | 211,847 | February 4, 1879 | Improvement in Lightning Rods Coupling for lightning rods that is larger diameter than rod and supplied with male and female threads |
HEWITT, John |
Lightning Rod Coupling | |
| U | 214,558 | April 22, 1879 | Improvement in Lightning Rod Couplings Lightning rod coupling made by inserting a tenon on the ends of rod sections, driving a non-corrosive male threaded thimble on the tenon, and screwing the ends of adjoing rods into a collar coupling |
FRITSCH, Joseph W. |
Lightning Rod Coupling | |
| 1882 | ||||||
| U | 257,889 | May 16, 1882 | Lightning Rod Coupling Coupling for spiraling lightning rods that is strong and can be screwed together |
PATEE, Theodorus H. |
Lightning Rod Coupling | |
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