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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 = '51') AND (category.subclass = '308') ORDER BY date ASC, patent, type

Total of 3 patents found where: Class is '51'; Subclass is '308';

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T / S Patent Date Description Patentee Category Assigned To
 1912
U 1,049,005 December 31, 1912 Insulating Composition and Process of Making the Same
Artificial reconstructed lava made from combining soapstone or talc (hydrated silicate of magnesia), with a binder which is the precipitate of a mixture of magnesium sulfate and sodium silicate. The combination is then molded to the desired shape and fire
STEINMETZ, Charles P.
Composition General Electric Co.
 1914
U Specimen known 1,091,678 March 31, 1914 Insulating Composition
Boro-silicate glass
LOCKE, Fred M.
Boron  
U Specimen known 1,091,679 March 31, 1914 Insulator
Boro-silicate glass
LOCKE, Fred M.
Boron  

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