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:
Jul. 22, 2008
Filed:
Feb. 03, 2006
Applicant:
Toshikazu Onishi, Kyoto, JP;
Inventor:
Toshikazu Onishi, Kyoto, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H01L 21/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A semiconductor laser device according to the present invention has a semiconductor substrate, an active layer formed on the semiconductor substrate and made of a compound semiconductor containing phosphorus, a guide layer formed on the active layer and made of a compound semiconductor a dopant diffusion preventing layer formed on the guide layer and made of a semiconductor compound containing arsenic, and a clad layer formed on the dopant diffusion preventing layer and made of a compound semiconductor containing a dopant.