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:
May. 29, 1979
Filed:
May. 01, 1978
Applicant:
Inventor:
Karl G Hernqvist, Princeton, NJ (US);
Assignee:
RCA Corporation, New York, NY (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
313221 ; 313227 ;
Abstract
A mercury arc lamp envelope is made of high purity synthetic fused silica which contains total metallic impurities of less than one part per million by weight and OH radical content of less than five parts per million by weight. Lamps having envelopes made from this material show little or no devitrification after 1000 hours of operation.