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. 12, 1978
Filed:
Sep. 20, 1977
Applicant:
Inventors:
Bernard M Depouilly, Paris, FR;
Edouard M Issenmann, Versailles, FR;
Assignee:
Le Material Telephonique, Boulogne-Billancourt, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
1791 / ;
Abstract
A telephone exchange signalling unit is provided having looping means for feeding back and comparing transmitted data multiplets directly with its input data. This test is ordered by the control unit of the telephone exchange without the necessity of using wires other than the distribution and scan wires of the telephone exchange and the signalling unit.