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:
Aug. 28, 2007
Filed:
Jun. 26, 2003
Nanu Brates, Winchester, MA (US);
Shinichi Anami, Wellesley, MA (US);
Huiling Zhu, Lexington, MA (US);
Stefaan M. Lambrechts, Beverly, MA (US);
Jakob Maya, Brookline, MA (US);
Nanu Brates, Winchester, MA (US);
Shinichi Anami, Wellesley, MA (US);
Huiling Zhu, Lexington, MA (US);
Stefaan M. Lambrechts, Beverly, MA (US);
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 for use in selected lighting fixtures comprising a discharge chamber having light permeable walls of a selected shape including therein a pair of end region wall portions through each of which a corresponding one of a pair of electrodes are supported separated from one another by a separation length. The ratio of the separation length to the effective operation inner diameter of the chamber is greater than two. The lengths of the wall sides between the end wall portions is greater than the effective operation inner diameter. The end wall portions have inner surfaces of constant or smaller varying radii of curvature and they are separated from the interior ends of the electrodes by more than one millimeter. The discharge chamber can be constructed of polycrystalline alumina and contain metal halides.