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Class Information
Number: 400/488
Name: Typewriting machines > Key-board or key lever-actuating mechanism > Key-board including row of keys having different heights
Description: Subject matter wherein significance is attributed to the positioning of the key* elements of a key-board* in accordance with the distances from the topmost surface of each key element to a common base.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7439959 |
Key arrangement for a keyboard |
Oct. 21, 2008 |
| 7345599 |
Computer keyboard |
Mar. 18, 2008 |
| 7338224 |
Ergonomic keyboard apparatus |
Mar. 4, 2008 |
| 7324019 |
Adjustable ergonomic keyboard for use with stationary palm and elements thereof |
Jan. 29, 2008 |
| 7298363 |
Innovated keyboard for personal digital assistant |
Nov. 20, 2007 |
| 7248202 |
Finger feeling numerical buttons for commercial electronic remote control |
Jul. 24, 2007 |
| 7182533 |
Keyboard contoured to the natural shape of the hand |
Feb. 27, 2007 |
| 7131781 |
Keyboards |
Nov. 7, 2006 |
| 6991389 |
Foldable keyboard |
Jan. 31, 2006 |
| 6984081 |
Adjustable keyboard with adjusting and locking mechanism, and method of its use |
Jan. 10, 2006 |
| 6940490 |
Raised keys on a miniature keyboard |
Sep. 6, 2005 |
| 6869239 |
Compact keyboard with sliding motion key actuation |
Mar. 22, 2005 |
| 6860661 |
Ergonomic keyboard |
Mar. 1, 2005 |
| 6802662 |
Non-linear ergonomic keyboard |
Oct. 12, 2004 |
| 6793421 |
Folding keyboard |
Sep. 21, 2004 |
| 6752551 |
Vertically expandable keyboard |
Jun. 22, 2004 |
| 6729783 |
Keyboard deflection control |
May. 4, 2004 |
| 6679639 |
Folding keyboard for a personal digital assistant |
Jan. 20, 2004 |
| 6543947 |
Keyboard having keys arranged in a pan configuration |
Apr. 8, 2003 |
| 6443643 |
Ergonomic keyboard |
Sep. 3, 2002 |
| 6270268 |
Keyboard apparatus |
Aug. 7, 2001 |
| 6262882 |
Small thickness lap-top computer having peripheral keys of reduced height |
Jul. 17, 2001 |
| 6183149 |
Impact absorbing keyboard, contoured to the natural shape of the hand |
Feb. 6, 2001 |
| 6139207 |
Keyboard apparatus |
Oct. 31, 2000 |
| 6059470 |
Adjustable, curved keyboard |
May. 9, 2000 |
| 5899616 |
Impact absorbing keyboard, contoured to the natural shape of the hand and method of using |
May. 4, 1999 |
| 5889510 |
Foot-operated keyboard device |
Mar. 30, 1999 |
| 5880685 |
Computer keyboard with accessory platform |
Mar. 9, 1999 |
| 5818360 |
Configuration for a computer input device |
Oct. 6, 1998 |
| 5774384 |
Keyboard with elevatable keys |
Jun. 30, 1998 |
| 5757292 |
Keyboard cap extension apparatus |
May. 26, 1998 |
| 5739776 |
Key switch arrangement for computer keyboards |
Apr. 14, 1998 |
| 5735619 |
Adjustable, curved keyboard |
Apr. 7, 1998 |
| 5689253 |
Ergonomic keyboard apparatus |
Nov. 18, 1997 |
| 5673040 |
Ergonomic keyboard apparatus |
Sep. 30, 1997 |
| 5660488 |
Ergonomically condensed QWERTY keyboard |
Aug. 26, 1997 |
| 5610602 |
Keyboard and method for producing |
Mar. 11, 1997 |
| 5599119 |
Tape printing device and tape cartridge used therein |
Feb. 4, 1997 |
| 5560724 |
Keyboard having improved keytop |
Oct. 1, 1996 |
| 5490037 |
Flexing keyboard structure for a notebook computer |
Feb. 6, 1996 |
| 5486059 |
Keyboard having improved keytop |
Jan. 23, 1996 |
| 5481263 |
Computer with separate left hand and right hand operated keyboard units |
Jan. 2, 1996 |
| 5469160 |
Computer keyboard |
Nov. 21, 1995 |
| 5439304 |
Keyboard |
Aug. 8, 1995 |
| 5411341 |
Keyboard for choice of symbols having hand supports |
May. 2, 1995 |
| 5397189 |
Non-planar ergonomic keyboard |
Mar. 14, 1995 |
| 5391006 |
Snap on ergonomic keycaps |
Feb. 21, 1995 |
| 5360280 |
Ergonomic keyboard including arcuate elongated keys |
Nov. 1, 1994 |
| 5358343 |
Keyboard with transversely activated non-alphanumeric keys |
Oct. 25, 1994 |
| 5351066 |
Rotating plane keyboard |
Sep. 27, 1994 |
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