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. 25, 2001
Filed:
Nov. 14, 1997
Applicant:
Inventors:
Leonard George Bleile, Calgary, CA;
Christopher Henry Becker, Calgary, CA;
Assignee:
Nortel Networks Limited, St. Laurent, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M 1/66 ;
U.S. Cl.
CPC ...
H04M 1/66 ;
Abstract
A method and apparatus for signalling a telephone switch to indicate the presence of a telephone of a pre-defined type on a subscriber loop. A subscriber loop is sensed to detect whether or not a telephone of a pre-defined type is connected to the subscriber loop. A first acknowledgement signal is transmitted to the telephone switch if the telephone of the pre-defined type is connected to the subscriber loop and off-hook and a second acknowledgement signal is transmitted to the telephone switch if the telephone of the pre-defined type is not off-hook.