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:
May. 01, 1990
Filed:
Jul. 03, 1989
Applicant:
Inventor:
John J Dernovsek, Madison, AL (US);
Assignee:
Palco Telecom Inc., Nashville, TN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
379145 ; 379150 ; 379152 ; 194202 ;
Abstract
A telephone paystation theft inhibiting circuit for detecting the grounding of the handset circuit conductors. Protection is provided for the receiver circuit conductor by means of an isolation transformer and solid state switching devices are employed to disconnect the transmitter from its associated circuit conductors when the grounding condition occurs.