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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 = '307') ORDER BY date ASC, patent, type

Total of 3 patents found where: Class is '403'; Subclass is '307';

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T / S Patent Date Description Patentee Category Assigned To
U 211,847 February 4, 1879 Improvement in Lightning Rods
Coupling for lightning rods that is larger diameter than rod and supplied with male and female threads
Lightning Rod Coupling  
U 214,558 April 22, 1879 Improvement in Lightning Rod Couplings
Lightning rod coupling made by inserting a tenon on the ends of rod sections, driving a non-corrosive male threaded thimble on the tenon, and screwing the ends of adjoing rods into a collar coupling
FRITSCH, Joseph W.
Lightning Rod Coupling  
U 257,889 May 16, 1882 Lightning Rod Coupling
Coupling for spiraling lightning rods that is strong and can be screwed together
PATEE, Theodorus H.
Lightning Rod Coupling  

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