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. 06, 1984
Filed:
Aug. 04, 1982
Applicant:
Inventors:
Fukuma Sakamoto, Osaka, JP;
Shizuo Izumida, Osaka, JP;
Assignee:
Sumitomo Electric Industries, Inc., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
455619 ; 455237 ;
Abstract
A signal receiving circuit for optical communication, which receives light modulated with frequencies corresponding to two values, to receive data, comprises an addition circuit provided in the front stage of a demodulator, the addition circuit adapted to superpose on an electrical signal provided by converting light received a signal having a frequency which is smaller in amplitude than the electrical signal.