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. 21, 1998
Filed:
May. 06, 1996
Applicant:
Inventors:
Assignee:
VLSI Technology, Inc., San Jose, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01H / ;
U.S. Cl.
CPC ...
307113 ; 307112 ; 307141 ; 341 22 ; 341 24 ; 326 38 ; 379368 ;
Abstract
A key handling circuit for a switching matrix having row and column conductors includes bidirectional drives for the row conductors and the column conductors. The row drive and the column drive are in a low conductive condition except when a relevant key switch is activated. The row drive provides a current input for the column drive in one phase of operation and the column drive provides a current input for a row drive in a second phase of operation.