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:
Jun. 06, 2006
Filed:
May. 05, 2004
Stefaan M. Lambrechts, Beverly, MA (US);
Nobuyoshi Takeuchi, Osaka, JP;
Jakob Maya, Brookline, MA (US);
Stefaan M. Lambrechts, Beverly, MA (US);
Nobuyoshi Takeuchi, Osaka, JP;
Jakob Maya, Brookline, MA (US);
Matsushita Electric Industrial Co. Ltd., Osaka, JP;
Matsushita Electric Works, Ltd., Osaka, JP;
Abstract
An arc discharge metal halide lamp having a discharge chamber having visible light permeable walls bounding a discharge region supported electrodes in a discharge region spaced apart by a distance Lwith an average interior diameter equal to D so they have a selected ratio with D exceeding a minimum value. Ionizable materials are provided in this chamber involving a noble gas, one or more halides, and mercury in an amount sufficiently small so as to result in a relatively low maximum voltage drop between the electrodes during lamp operation for a lamp dissipation sufficient to have the chamber wall loading exceed a minimum value or so as to maintain chamber luminosity above a minimum value for a selected operational duration.