| 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 = '57') AND (category.subclass = '200') ORDER BY date ASC, patent, type |
Total of 2 patents found where: Class is '57'; Subclass is '200';
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 |
| 1871 | ||||||
| U | 112,426 | March 7, 1871 | Improvement in Lightning Rods Lightning rod made of three or more galvanized iron wires with copper wire laid over and in the grooves between the iron wires to form a metal rope |
CUSHMAN, Sylvanus D. |
Lightning Rod | |
| 1876 | ||||||
| R | 7,063 | April 18, 1876 | Improvement in Lightning Conductors, Rods, or Cables Lightning rod conductor made of wires twisted together and wrapped and twisted around a metal tube (see 120,457) |
PRESTON, Othniel |
Lightning Rod | |
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