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:
Aug. 15, 1989
Filed:
Sep. 12, 1988
Applicant:
Inventors:
Masanori Katsuta, Shizuoka, JP;
Tsutomu Yamaguchi, Shizuoka, JP;
Assignee:
Kabushiki Kaisha Kawai Gakki Seisakusho, Shizuoka, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G10C / ;
U.S. Cl.
CPC ...
84439 ;
Abstract
An action mechanism for a keyboard of an electronic piano which is capable of producing a touch that is nearly equal to that of an ordinary piano. The action mechanism comprises an action spring including a friction spring portion to produce a friction force which always opposes depression and restoring movements of key members.