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:
Feb. 03, 1976
Filed:
Sep. 23, 1974
Applicant:
Inventors:
Dominic J DiGianfilippo, Chicago, IL (US);
Douglas W Nickerson, East Dundee, IL (US);
Assignee:
Motorola, Inc., Chicago, IL (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04Q / ;
U.S. Cl.
CPC ...
179 / ; 325 37 ; 343227 ;
Abstract
A circuit for disabling, or shutting down, the transmitter of a mobile telephone unit when the unit is not connected to another party is disclosed. When such a 'wild' mobile is sensed, a sequence of idle and seize audio tones are sent and transitions therebetween are counted. When a specific number of counts are counted a disable signal is developed. The counter is continually reset and does not count when the handset is on hook. When the handset is off hook and the mobile is talking to a party voice falsing of the counter is prevented by a timer circuit.