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:
Jul. 10, 1990
Filed:
Jun. 20, 1988
Applicant:
Inventors:
James D Nihart, Rochester, MN (US);
Samuel M Prabhakar, Rochester, MN (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M / ; H04B / ;
U.S. Cl.
CPC ...
364580 ; 371 204 ; 371 221 ; 371 24 ; 371 165 ; 371 572 ;
Abstract
A hand-held battery-powered instrument tests communications ports of a data-processing system by analyzing received data frames for multiple conditions, such as parity, poll commands, and violation sequences. Indicator lights show proper/improper operation of the port, and also indicate phase reversal of the lines.