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:
Nov. 11, 2003
Filed:
May. 18, 2001
Applicant:
Inventors:
Takahiro Arakida, Tokyo, JP;
Hitoshi Hotta, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S 5/00 ;
U.S. Cl.
CPC ...
H01S 5/00 ;
Abstract
A semiconductor laser device includes an inner lower clad layer formed on a semiconductor layer, an active layer formed on the inner lower clad layer, an inner upper clad layer formed the active layer, a blocking layer formed on the inner upper clad layer to block current, wherein the blocking layer having a concave portion, and an outer upper clad layer formed to cover the blocking layer. Carriers are injected to the active layer through the outer upper clad layer and the concave portion of the blocking layer.
Arakida, Takahiro. (2003). Semiconductor laser device capable of preventing degradation of characteristics (U.S. Patent No. 6647043). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/6647043
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile