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. 02, 1976
Filed:
Apr. 21, 1975
Applicant:
Inventors:
Frank Cangiano, Hillsboro, NH (US);
Stephen A Reed, III, Hillsboro, NH (US);
Wilfred L Boule, Antrim, NH (US);
David R Dayton, Bow, NH (US);
Assignee:
GTE Sylvania Incorporated, Danvers, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01K / ;
U.S. Cl.
CPC ...
148-63 ; 148 / ; 148 203 ; 148133 ; 140 715 ; 427111 ;
Abstract
The coiled tungsten filament of an incandescent lamp is made more resistant to sagging by exposing the filament to a vaporized phosphorus atmosphere so as to form tungsten monophosphide on the filament. The filament is subsequently heated in order to dissociate the tungsten monophosphide and evaporate the phosphorus therefrom.
Quick Actions:
Cangiano, Frank. (1976). Method of making incandescent lamp (U.S. Patent No. 3989549). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/3989549
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile