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. 19, 1994
Filed:
Mar. 11, 1993
Applicant:
Inventors:
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 50 ; 372 45 ;
Abstract
An optical semiconductor device in which both of positive input and negative input are possible is disclosed. In the optical semiconductor device, two heterojunction phototransistors are connected in parallel of each other to the cathode of a laser diode. An optical memory in which setting, i.e., writing and resetting, i.e., erasing by light are possible is also disclosed. In the optical memory, two heterojunction phototransistors are connected in parallel of each other to the cathode of a laser diode to make a memory cell.