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 WHERE (category = 'Feldspar') ORDER BY date ASC, patent, type

Total of 3 patents found where: Category is 'Feldspar';

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
 1908
U 897,636 September 1, 1908 Process for Making Feldspar Flux
Feldspar flux, method of preparing
LOCKE, Fred M.
Feldspar  
U 907,155 December 22, 1908 Manufacture of Spar Insulators
Feldspar insulator material (see reissue 12,992 on 7-13-1909)
LOCKE, Fred M.
Feldspar  
 1909
R 12,992 July 13, 1909 Manufacture of Spar Insulators
Feldspar insulator material (reissue of 907,155)
LOCKE, Fred M.
Feldspar  

Total of 0.01 seconds