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, 1990
Filed:
Jul. 31, 1989
Applicant:
Inventor:
Thomas R Wroblewski, Sterling Heights, MI (US);
Assignee:
Chrysler Corporation, Highland Park, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04J / ;
U.S. Cl.
CPC ...
370112 ; 340 / ; 341 26 ;
Abstract
A smart multiplex keypad scanner system for scanning a matrix of switches utilizes a portion of a clock pulse to read the switch status of one of the switches in a matrix of switches in a system in which a standard counter of a chosen modulo value that counts up to a value one less than the number of switches in the matrix is employed to generate addresses of switches in the matrix.