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:
Oct. 25, 1983
Filed:
Dec. 29, 1980
Applicant:
Inventor:
James R Holden, Chicago, IL (US);
Assignee:
GTE Automatic Electric Labs Inc., Northlake, IL (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ; H04M / ;
U.S. Cl.
CPC ...
364200 ; 179 / ;
Abstract
A control circuit, for use in a telephone switching system, which monitors, controls and transfers data to and from memory, input-output devices and external circuits. A microprocessor operates under control of read-only and random-access memories. It communicates with the external telephone system via bus transceivers and a programmable interrupt controller. The integrity of this circuit is monitored by high reliability data and address parity circuits.