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:
Dec. 10, 1985
Filed:
Oct. 03, 1983
Applicant:
Inventors:
C James Corris, Shenandoah, GA (US);
Blaine E Beck, Peachtree City, GA (US);
Assignee:
Cellutron Corporation, Stamford, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
179 / ; 179 / ; 179 / ;
Abstract
A circuit for interfacing a telephone system, such as a cordless telephone, to telephone lines by the use of opto-couplers, arranged to establish a telephone line loop upon detecting a ringing signal on the telephone lines. Preferably, three opto-couplers are used in varying combinations to provide a standby condition, ringing detection, ringing detection shut-off, telephone line loop connection, incoming audio, and outgoing audio functions. Such a circuit eliminates the use of transformers and relays, while meeting regulations.