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:
Oct. 18, 1983
Filed:
Jul. 21, 1981
Applicant:
Inventor:
Patrick R Beirne, Stittsville, CA;
Assignee:
Mitel Corporation, Kanata, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05F / ; H04M / ; H04M / ;
U.S. Cl.
CPC ...
179 / ; 323284 ;
Abstract
This invention is a circuit for reducing the power requirements for a subscriber's line where the loop length is short. The circuit senses the line current in the off-hook condition, and if the line current is above a predetermined threshold, it decreases the power supply voltage. When the line is restored to the on-hook condition, the original high voltage is restored. A substantial reduction in the cost and size of the power supply is thus obtained.