| 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 = '275') ORDER BY date ASC, patent, type |
Total of 2 patents found where: Class is '403'; Subclass is '275';
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 |
| 1877 | ||||||
| U | 196,235 | October 16, 1877 | Improvement in Lightning Rods Lightning rod made with a spirally fluted tubular core with one or more smaller tubular wires wrapped around in the fluted depressions with coupling having a male thread on each end to screw into end of rod which has female threads |
KNAPP, George S. |
Lightning Rod | |
| 1909 | ||||||
| U | 940,742 | November 23, 1909 | Water Retaining and Conveying Attachment for Cable Lightning Rods Method of retaining water in the ground to aid in conducting the current to ground |
SIMPSON, Harvey |
Lightning Rod | |
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