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:
Dec. 27, 2005
Filed:
Jan. 31, 2002
Huiling Zhu, Lexington, MA (US);
Shin Ukegawa, Kyotanabe, JP;
Hiroshi Nohara, Nishinomiya, JP;
Jakob Maya, Lexington, MA (US);
Huiling Zhu, Lexington, MA (US);
Shin Ukegawa, Kyotanabe, JP;
Hiroshi Nohara, Nishinomiya, JP;
Jakob Maya, Lexington, 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 having a discharge chamber with light permeable ceramic walls of a selected shape about a discharge region of a selected volume. A pair of electrodes are supported in the discharge region separated from one another by a separation length. The separation length is in a ratio to the effective inner diameter that is greater than four. Ionizable materials are provided in the discharge region comprising a quantity of mercury in a ratio to the discharge region volume that is less than 4 mg/cm, a noble gas, praseodymium halide, and sodium halide.