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Class Information
Number: 341/24
Name: Coded data generation or conversion > Bodily actuated code generator > Including keyboard or keypad > With error prevention means (e.g., debounce, antichatter)
Description: Subject matter including compensation for improper system operation or operator actuation.

Sub-classes under this class:

Class Number Class Name Patents
341/25 With rollover feature (i.e., antidoublestrike) 58

Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
6567016 Typematic guard protocol for wireless keyboards May. 20, 2003
6441753 Multi-function key assembly for an electronic device Aug. 27, 2002
6438699 Key stroke detection for keyboard remote wake-up Aug. 20, 2002
6417787 Method and apparatus for increasing the number of keys of a key-matrix Jul. 9, 2002
6298107 Narrowband digital cordless telephone with a logic high weak driver and a logic low strong driver for keypad interface Oct. 2, 2001
6204839 Capacitive sensing keyboard and pointing device Mar. 20, 2001
6198475 Touch operation information output device Mar. 6, 2001
6104318 Method for entering a special mode of an electric device Aug. 15, 2000
6028538 Method, keyboard and system for transmitting key characters Feb. 22, 2000
5818451 Computer programmed soft keyboard system, method and apparatus having user input displacement Oct. 6, 1998
5783874 Keypad handling circuits Jul. 21, 1998
5734331 Input control for radio selective calling receiver Mar. 31, 1998
5708227 Electronic musical instrument Jan. 13, 1998
5689247 Automated system for identifying authorized system users Nov. 18, 1997
5677687 Zero DC power keyboard scanner using bidirectional I/O's with repeaters Oct. 14, 1997
5557299 Method and apparatus for a learning styled computer keyboard Sep. 17, 1996
5552781 Fault tolerant method of decoding an electronic key system Sep. 3, 1996
5523755 N-key rollover keyboard without diodes Jun. 4, 1996
5521575 Key signal input circuit for microcomputer May. 28, 1996
5512893 Keypad scanner process and device and cordless telephone employing the mechanism Apr. 30, 1996
5486824 Data processor with a hardware keyscan circuit, hardware keyscan circuit, and method therefor Jan. 23, 1996
5469159 Method capable of judging validity or invalidity of a status of switching elements in a keyboard switch device Nov. 21, 1995
5463386 Electrical matrix keyboard scanning circuit Oct. 31, 1995
5457455 Real time keyboard scanner Oct. 10, 1995
5406273 Data processor Apr. 11, 1995
5371498 Circuit for recognizing key inputs Dec. 6, 1994
5315539 Method and apparatus for debouncing signals May. 24, 1994
5266950 Programmable keypad monitor Nov. 30, 1993
5264845 Key scan circuit and method in a microcomputer system Nov. 23, 1993
5220323 Keyboard apparatus having ghost key sensing function Jun. 15, 1993
5220601 Keypad status reporting system Jun. 15, 1993
5202585 Electronic device including improved connection device Apr. 13, 1993
5153572 Touch-sensitive control circuit Oct. 6, 1992
5138137 Fault detecting membrane potentiometer switch Aug. 11, 1992
5097113 Touch switch arrangement for a heating cooking appliance Mar. 17, 1992
5066951 Circuit arrangement for adjusting the triggering point of an inductive keyboard Nov. 19, 1991
5059974 Method for determining phantom switch condition Oct. 22, 1991
5036321 Capacitive sensing, solid state touch button system Jul. 30, 1991
RE33558 Electronic musical instrument forming tone waveforms Mar. 26, 1991
4988997 Method for character code generation Jan. 29, 1991
4929944 Key input apparatus May. 29, 1990
4922248 Key output method for keyboards May. 1, 1990
4920253 Control device for a cooking apparatus which controls a plurality of functions using a single resistance element Apr. 24, 1990
4914358 Touch panel input control method Apr. 3, 1990
4897718 Rapid access remote control system Jan. 30, 1990
4888600 Keyboard arrangement with ghost key condition detection Dec. 19, 1989
4859100 Keyboard to prevent erroneous simultaneous activation of keys Aug. 22, 1989
4855590 Infrared touch input device having ambient compensation Aug. 8, 1989
4845467 Keyboard having microcomputerized encoder Jul. 4, 1989
4836700 Data entry system Jun. 6, 1989

1 2 3 4

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