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 = '52') AND (category.subclass = '200') ORDER BY date ASC, patent, type

Total of 4 patents found where: Class is '52'; Subclass is '200';

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
 1940
U 2,198,450 April 23, 1940 Light Transmitting Structure
Skylight construction using glass blocks
CHERTKOF, Jack O.
OU  
 1958
U 2,851,973 September 16, 1958 Skylight Construction
Skylights made of glass block
STARK, Charles H.
LENKE, George H.
OI Owens-Illinois Glass Co.
U 2,858,734 November 4, 1958 Skylight
Glass Block Skylight
BOYD, Robert A.
OI Owens-Illinois Glass Co.
 1960
U 2,947,267 August 2, 1960 Skylight Mounting
Glass block for skylight
STARK, Charles H.
OI Owens-Illinois Glass Co.

Total of 0.00 seconds