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:
Year between: and
Patentee starting with:
Assigned To starting with:
Description containing:
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 = '65') AND (category.subclass = '348') ORDER BY date ASC, patent, type

Total of 3 patents found where: Class is '65'; Subclass is '348';

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 2,254,227 September 2, 1941 Glass Tempering Method and Apparatus
Glass tempering of suspension insulators in a controlled manner
LEWIS, Evan J.
Glass Corning Glass Works
U 2,418,713 April 8, 1947 Thermally Toughened Insulator
CD 228.5: tempering the surface of glass insulators for added strength
HOLMES, Minot K.
Insulator Owens-Illinois Glass Co.
U 2,978,839 April 11, 1961 Apparatus for Finishing Apertured Glass Articles
Fire polishing of holes for thru hole insulators CD 1049
EASTUS, Harold L.
Manufacturing Kimble Glass Co.

Total of 0.02 seconds