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Class Information
Number: 84/239
Name: Music > Instruments > Stringed > Pianos > Hammers actions > Horizontal > Grand
Description: The modern standard action of the Herz-Erard type, in which the jack and repetition-lever both engage the nose on the hammer.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7129403 |
Friction at the jack and knuckle interface in a grand piano eliminated |
Oct. 31, 2006 |
| 6720489 |
Piano muter |
Apr. 13, 2004 |
| 6639133 |
Universal piano action striking vertical and horizontal strings from below and above |
Oct. 28, 2003 |
| 6232537 |
Piano action with articulated jack |
May. 15, 2001 |
| 5602351 |
Grand piano-like keyboard instrument for selectively producing acoustic sound and synthesized sound |
Feb. 11, 1997 |
| 5239907 |
Muting device of grand piano |
Aug. 31, 1993 |
| 5194685 |
Keyboard musical instrument hammer movement detection apparatus |
Mar. 16, 1993 |
| 5125309 |
Adjustable friction grand piano action |
Jun. 30, 1992 |
| 4953433 |
Action for grand piano |
Sep. 4, 1990 |
| 4860626 |
Wippen heel mechanism for an upright piano |
Aug. 29, 1989 |
| 4856402 |
Grand piano actions |
Aug. 15, 1989 |
| 4774868 |
Piano key action |
Oct. 4, 1988 |
| 4685371 |
Grand piano action |
Aug. 11, 1987 |
| 4226158 |
Damper assembly for keyboard musical instruments |
Oct. 7, 1980 |
| 4203341 |
Damper assembly of pianos |
May. 20, 1980 |
| 4096779 |
String anchor replacement for repetition lever and jack in a piano action |
Jun. 27, 1978 |
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