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:
Jan. 05, 1999
Filed:
Mar. 15, 1996
Applicant:
Inventors:
Jean M Evans, North Hampton, NH (US);
Harold L Rothwell, Jr, Hopkinton, NH (US);
Assignee:
Osram Sylvania Inc., Danvers, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ; H01J / ;
U.S. Cl.
CPC ...
313491 ; 313356 ; 313631 ;
Abstract
An electric discharge lamp with an internally threaded electrode is disclosed. The lamp includes an envelope, a support rod, and an electrode can with an interior surface having a multiplicity of peaks, points, of sharp edge regions. These equal height prominences evenly extended around the inside wall of the electrode can. The threaded electrode yields a highly emissive electrode with no emissive material to be eroded.