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:
Aug. 22, 1989
Filed:
Sep. 23, 1988
Applicant:
Inventors:
James E Kohl, Schenectady, NY (US);
Donald L Watrous, Clifton Park, NY (US);
Assignee:
Pacific Bell, San Francisco, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
379 16 ;
Abstract
A method and apparatus for detecting and locating defective crosspoint switches in a path consisting of a plurality of conducting segments connected by switch points is disclosed. The method and apparatus utilize the change in capacitance of the path which occurs when the switches are operated in a predetermined order.