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 = '220') AND (category.subclass = '2.1R') ORDER BY date ASC, patent, type

Total of 3 patents found where: Class is '220'; Subclass is '2.1R';

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
 1937
U Specimen known 2,094,287 September 28, 1937 Method of Manufacturing Multipart Glass Articles
Method to manufacture multiple glass objects (blocks, insulators, etc.)		 ZIMMERMAN, Willard P.
HOLMES, Minot K.
 Method Owens-Illinois Glass Co.
 1950
U 2,532,478 December 5, 1950 Building Block
Multiple celled glass block		 BRIDGES, Donald A.
 OI Owens-Illinois Glass Co.
 1951
U 2,562,292 July 31, 1951 Glass composition for electrical bulbs (TV tubes?)
Glass Composition		 BLACK, Harold R.
GAGIN, Lawrence V.
 OI Owens-Illinois Glass Co.

Total of 0.00 seconds