| 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 = '658') ORDER BY date ASC, patent, type |
Total of 2 patents found where: Class is '428'; Subclass is '658';
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 |
| 1852 | ||||||
| U | 8,930 | May 4, 1852 | Improvement in Lightning Rods Lightning rod point made of steel coated with various other metals such as copper, tin, etc. |
SPRATT, James |
Lightning Rod Point | |
| 1876 | ||||||
| U | 171,744 | January 4, 1876 | Improvement in Lightning Rods Lightning rod composed of a copper sheet wrapped around a metal bar with copper wrapped wires on either side and the whole twisted |
SMITH, Charles H. |
Lightning Rod | |
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