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:
Jun. 13, 1989
Filed:
Mar. 18, 1986
Applicant:
Inventor:
David Fiori, Jr, Yardley, PA (US);
Assignee:
Sensor Technologies, Inc., Bensalem, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G10H / ; G10H / ;
U.S. Cl.
CPC ...
84-11 ; 84-127 ; 84DI / ; 336 79 ; 334 75 ; 341 32 ;
Abstract
A musical keyboard having keys which carry metal spoilers that alter the resonance characteristics of tank circuits associated with the keys as the keys move toward and away from the inductance coils of the tank circuits. The tank circuits are connected sequentially to a frequency sensing circuit which develops indications of key positions by sensing the resonance frequency of each tank circuit.