The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 24, 1976
Filed:
Feb. 16, 1972
Applicant:
Inventors:
Martha J Thomas, Winchester, MA (US);
Richard A Fowler, Ipswich, MA (US);
Robert C Larson, Exeter, NH (US);
Assignee:
GTE Sylvania Incorporated, Danvers, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C25D / ;
U.S. Cl.
CPC ...
204181 ;
Abstract
A solution containing dissolved tungsten and dissolved aluminum is spray dried to recover a tungsten-and-aluminum containing powder. The powder is then fired to eliminate hydrated water and volatiles and to convert the aluminum compound into alumina. The powder is next fired at a higher temperature in a reducing atmosphere to reduce the tungsten compound to elemental tungsten. A coating suspension containing the tungsten-alumina powder is then prepared and electrophoretically deposited on cathode heaters.