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:
Sep. 09, 1980
Filed:
Jun. 08, 1979
Brian J Vaughan, Ottawa, CA;
Mitel Corporation, Kanata, CA;
Abstract
A circuit for translating a loop start to a ground start signal in a communication system interconnected via a tip lead and a ring lead, in which the ring lead is connected to a source of potential at a central office or PABX, is comprised of a latching switch connected from a ring lead terminal through a resistance to a ground terminal, a latching switch closing circuit connected to the tip lead for sensing a predetermined potential applied thereto, adapted to close the switch upon its detection of at least a predetermined proportion of the potential applied to the tip lead as a result of the external application of the source of potential from the ring lead to ground, and a latching switch opening circuit adapted to open the switch following connection of the tip lead to ground through external circuity at the central office or PBX.