|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 = '256') AND (category.subclass = '7') ORDER BY date ASC, patent, type|
Total of 3 patents found where: Class is '256'; Subclass is '7';
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|
|U||18,963||December 29, 1857||Improved Device for Attaching Lightning Rods
Lightning rod made of corrugated copper sheets and attached with iron spikes
|ELLIOTT, J. B.
|U||189,286||April 3, 1877||Improvement in Lightning Rods
Lightning rod of twisted sheet metal fitted with a serrated strip
|VERMILYA, Leland D.
||Lightning Rod||1/2 to Henry Webbert|
|U||282,449||July 31, 1883||Lightning Rod
Lightning rod made of twisted copper or iron rods with points along the length exactly like barbed wire
|DODGE, Thomas D.
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