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:
Nov. 23, 1993
Filed:
Nov. 05, 1990
Applicant:
Inventor:
Larry Schotz, Maquon, WI (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
379102 ; 379184 ; 379387 ;
Abstract
Apparatus for enabling or disabling a selected telephone. A control signal having a unique predetermined frequency, which corresponds to a desired state of the selected telephone, is transmitted from a transmitter through standard telephone lines. The telephone is connected to a receiver, having one of a plurality of resonant circuits each tuned to one of the unique predetermined frequencies, which receives the control signal. When the frequency of the control signal matches the tuned frequency of a resonant circuit, the receiver connects or disconnects accordingly the selected telephone from the telephone lines thereby enabling or disabling, respectively, the selected telephone.