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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 = '235') ORDER BY date ASC, patent, type

Total of 3 patents found where: Class is '403'; Subclass is '235';

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T / S Patent Date Description Patentee Category Assigned To
U 19,819 March 30, 1858 Improvement in Lightning Conductors
Lightning rod made of iron wires wrapped with copper sheets
Lightning Rod Henry C. Janes
U 152,242 June 23, 1874 Improvement in Lightning Rods
Coupling to make T-connections for lightning rods
MOTT, John M.
Lightning Rod Coupling  
U 186,503 January 23, 1877 Improvement in Lightning Rod Connector Clips
Coupling or connector clip composed of flat metal bent around the adjoining rod with external threads formed on the end so the rod can be screwed onto the clip
SHOOK, Albert
Lightning Rod Coupling  

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