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. 07, 1978
Filed:
Aug. 31, 1977
Applicant:
Inventor:
Regis B Mellon, St. Petersburg, FL (US);
Assignee:
Akzona Incorporated, Asheville, NC (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
179 / ; 1791 / ; 179 / ;
Abstract
An improved telephone toll restrictor utilizing both current and voltage sensors having substantially infinite input impedance during the on-hook condition. A timing circuit is provided to restrict calls a predetermined time after a digit is dialed but prior to central office timeout. Furthermore, a pulse generator provides a strobe pulse to a coincidence gate which also responds to a digit pulse counter, for avoiding restriction of a digit which should not be restricted.