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:
Apr. 26, 1988
Filed:
Mar. 23, 1984
Takashi Kajimura, Tokyo, JP;
Shinichi Nakatuka, Kokubunji, JP;
Naoki Chinone, Hachioji, JP;
Michiharu Nakamura, Tokyo, JP;
Yuichi Ono, Tokyo, JP;
Hitachi, Ltd, , JP;
Abstract
A semiconductor laser device comprises a semiconductor layer stack consisting of a first clad layer, an active layer, and a second clad layer which are successively stacked on a semiconductor substrate, and a light absorbing layer and a current blocking layer which are stacked on the second clad layer; the semiconductor assembly including a stripe shaped groove which extends from the surface of the semiconductor layer stack to the surface or interior of the second cladding layer, and another semiconductor layer having a forbidden band width greater than the active layer and the same conductivity type as the second clad layer which is embedded into the groove by chemical vapor deposition method.