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:
Feb. 26, 1985
Filed:
Jun. 23, 1982
Applicant:
Inventor:
Michel Castel, Fenouillet, FR;
Assignee:
Renix Electronique, Toulouse Cedex, FR;
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
3403 / ; 34082559 ; 3403 / ; 178 / ;
Abstract
A keyboard having keys activated by electrical contacts and the capacity to read one state from among four possible states, wherein the keyboard is a dipole disposed between two terminals between which are positioned in parallel three connectors, each including one of the electrical contacts, two of these connectors including diodes mounted anode to cathode, in such a way that the various states may be discriminated by means of the successive application of two reverse electrical voltages (V1, V2) to the terminals of the dipole and the corresponding detection of the logic states of the contacts using a logic detector.