Search the Insulator Patent Reference Library:

Build your search criteria. The patent must match all the values specified.
Select patent types: Utility   Design   Reissue
Patent number:
Date:
Year between: and
Patentee starting with:
City:
State:
Assigned To starting with:
Description containing:
Category:
Class:    Subclass:
Click Search when complete:
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 = '501') AND (category.subclass = '57') ORDER BY description ASC, date, patent, type

Total of 1 patents found where: Class is '501'; Subclass is '57';

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
 1867
U Specimen known 64,196 April 30, 1867 Improvement in the Manufacture of Porcelain
Mixing cryolite, chiolite, and fluellite with sand and other common compounds for making glass in order to make a substance that looks similar to porcelain, but is actually glass that can be cast and formed like glass.
CHEYNEY, Waldron J.
Haley Insulator  

Total of 0.01 seconds