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:
Mar. 20, 1979
Filed:
Sep. 30, 1975
Noboru Masuda, Kawaguchi, JP;
Denki Onkyo Co., Ltd., Tokyo, JP;
Abstract
A keyboard switch circuit comprises a first plurality of terminals associated with m rows and a second plurality of terminals associated n columns. A plurality of series circuits each including a reluctance element and a diode are connected between the terminals associated with the rows and the columns, respectively, in a manner to correspond with key switches. By applying input pulse signals to the terminals of the rows, a keyboard signal corresponding to a key depressed is derived in the form of pulses on the terminals associated with the columns.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile