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:
Apr. 26, 1988
Filed:
Nov. 03, 1986
Applicant:
Inventor:
David W Callahan, Omaha, NE (US);
Assignee:
Independent Technologies, Inc., Omaha, NE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
379 21 ; 379 22 ; 379 27 ;
Abstract
The present invention discloses a unitary and hand held four conductor test apparatus that is designed to provide signaling operation tests on new or existing telecommunication special service circuits. The apparatus is comprised of circuitry which interconnects LEDs, a switching element and connection terminals. The apparatus terminates PBX dial tie trunk or special service circuit signaling leads at a designated 'demarcation point' and it is designed to exercise or manipulate the special service circuit's associated line equipment for testing.