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:
Aug. 10, 1999
Filed:
Dec. 19, 1996
Applicant:
Inventor:
Jan Kok, Munich, DE;
Assignee:
Siemens Aktiengesellschaft, Munich, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
361119 ; 361 91 ;
Abstract
Circuit arrangement for protecting a subscriber circuit of a telecommunication system for the balanced-to-ground connection of a subscriber line to which a ringing voltage source is connected unbalanced to ground via an electromechanical or electronic switch upon simultaneous disconnection from the subscriber circuit for call signalling against inductive over-voltages that occur upon reconnection to the subscriber line, characterized by a two-way threshold circuit (D) with symmetrical pass/stop characteristic whose threshold voltage is higher than the peak voltage of the ringing voltage source (UGR) that is connected between the leads (a, b) of the subscriber line.