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:
Nov. 07, 1978
Filed:
Oct. 13, 1977
Applicant:
Inventors:
Wolfgang J Choyke, Pittsburgh, PA (US);
Roland Stickler, Ternitz, AT;
Assignee:
Westinghouse Electric Corp., Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01K / ;
U.S. Cl.
CPC ...
29 2518 ; 29 2517 ;
Abstract
A method of preparing incandescible tungsten filaments which are doped with a predetermined concentration of selected dopant in order to provide filaments with predetermined characteristics. A beam of high velocity ions of the selected dopant are impinged against a target. The target is made up of a thin layer of finely divided tungsten powder. Dopant ions are implanted into the target layer until a predetermined dopant concentration is attained. The ion-implanted tungsten powder is then processed to form tungsten filaments.