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:
Oct. 10, 1978
Filed:
Dec. 06, 1977
Applicant:
Inventor:
Andre N Baratin, Neuilly-sur-Seine, FR;
Assignee:
Jeumont-Schneider, Puteaux, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ; H04B / ;
U.S. Cl.
CPC ...
179 / ; 179 77 ; 1791 / ;
Abstract
A subscriber's line equipment for a telephone exchange for replacing equipment comprising a telephone transformer or chopper, comprises a telphone line supply circuit comprised of two constant d.c. voltage sources, a transistor functioning as a constant current generator, a transformer connected to rectifying means, two transmitters connected to the primary winding of the transformer, a closed loop detecting circuit and receiving and transmitting circuits connected to receive and transmit signals to the telephone exchange.