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. 09, 1988
Filed:
Dec. 05, 1985
Applicant:
Inventors:
Assignee:
Matsushita Electric Works, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ; H05B / ;
U.S. Cl.
CPC ...
315246 ; 313634 ; 313631 ; 315D / ; 315D / ; 3152 / ;
Abstract
A high pressure discharge lamp wherein an arc tube is so formed at least at one end portion as to satisfy a predetermined condition, unlike any known configuration and dimensions of the arc tube end portion, to restrain occurrence of acoustic resonance phenomenon for reducing zones in which the phenomenon occurs at least to be below 50% and effectively preventing any adverse influence of the phenomenon on discharge arc column.