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:
Jan. 09, 1979
Filed:
Jan. 24, 1977
Applicant:
Inventor:
Juan M del Castillo, Mexico 20, D. F., MX;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01H / ; G10C / ;
U.S. Cl.
CPC ...
200 / ; 7448 / ; 200 / ; 2351 / ;
Abstract
Operation of a pushbutton or key mechanism by the operation of a single pushbutton or key through circuitry which may include fiber optics signals all keys on the keyboard included in the particular chord. The device may be built in or simply attached to the keyboard instrument. The keys are spring, and string or wire operated to return a key to its inoperative position when the next key is pressed down.