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:
Dec. 24, 2013
Filed:
Mar. 21, 2012
Kirk Burgett, Sacramento, CA (US);
Jamie Marks, Haverhill, MA (US);
Dana Mazzaglia, Haverhill, MA (US);
Kirk Burgett, Sacramento, CA (US);
Jamie Marks, Haverhill, MA (US);
Dana Mazzaglia, Haverhill, MA (US);
Wessell, Nickel & Gross, Sacremento, CA (US);
Abstract
A damper action for an upright piano that comprises a springed tab on the damper lever that 'ratchets' or gives way or folds away in one direction and does not in the other, to provide retention when the spring tab passes by the longitudinal ridge on the sostenuto rod in one direction and non-retention when the spring tab passes by the longitudinal ridge on the sostenuto rod the other direction. The ratchet aspect of the spring tab uses tension from the damper spring and does not require a separate spring to apply tension to yield the ratchet effect.