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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:
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Patent Number Title Of Patent Date Issued
8502705 Hybrid keypad including full travel keys and minimal travel keys Aug. 6, 2013
8400773 Mobile actuating device Mar. 19, 2013
8259074 Key arrangement for a keyboard Sep. 4, 2012
8228211 Adaptable keyboard system Jul. 24, 2012
8226308 Ergonomic keyboard with divided keys Jul. 24, 2012
8226310 Apparatus including a plurality of keys having in-use and stowed configurations Jul. 24, 2012
8092107 Electronic device with height adjustable keys Jan. 10, 2012
8011842 Apparatus for ergonomic typing Sep. 6, 2011
7969718 Computer keyboard with transparent covers for protecting key characters Jun. 28, 2011
7674053 Dual key pod data entry device Mar. 9, 2010
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

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