Inventor · disambiguated record
Karel Havel
Also filed as: HAVEL KAREL
59 granted patents·4,953 citations·filing 1976–2001
99Inventor score
Top patents by PatentIndex Score
59 records- 0199US4845481AContinuously variable color display deviceHAVEL KAREL·Filed 1986·Granted Jul 4, 1989·340 cites·8 claims
- 0299US4647217AVariable color digital timepieceHAVEL KAREL·Filed 1986·Granted Mar 3, 1987·301 cites·11 claims
- 0398US6018237AVariable color display systemTEXAS DIGITAL SYSTEMS INC·Filed 1997·Granted Jan 25, 2000·248 cites·8 claims
- 0498US5963185ADisplay device with variable color background areaTEXAS DIGITAL SYSTEMS INC·Filed 1996·Granted Oct 5, 1999·169 cites·3 claims
- 0598US5656935AVariable color display systemHAVEL KAREL·Filed 1995·Granted Aug 12, 1997·124 cites·3 claims
- 0698US5475300AVariable color digital multimeterHAVEL KAREL·Filed 1994·Granted Dec 12, 1995·121 cites·2 claims
- 0798US5283517AVariable color digital multimeterHAVEL KAREL·Filed 1992·Granted Feb 1, 1994·147 cites·2 claims
- 0898US5122733AVariable color digital multimeterHAVEL KAREL·Filed 1990·Granted Jun 16, 1992·141 cites·4 claims
- 0998US5003298AVariable color digital display for emphasizing position of decimal pointHAVEL KAREL·Filed 1989·Granted Mar 26, 1991·228 cites·6 claims
- 1098US4934852AVariable color display typewriterHAVEL KAREL·Filed 1989·Granted Jun 19, 1990·165 cites·10 claims
- 1198US4824269AVariable color display typewriterHAVEL KAREL·Filed 1988·Granted Apr 25, 1989·156 cites·25 claims
- 1298US4707141AVariable color analog timepieceHAVEL KAREL·Filed 1987·Granted Nov 17, 1987·192 cites·7 claims
- 1398US4686425AMulticolor display deviceHAVEL KAREL·Filed 1986·Granted Aug 11, 1987·179 cites·2 claims
- 1497US6181126B1Dual variable color measuring systemTEXAS DIGITAL SYSTEMS INC·Filed 1999·Granted Jan 30, 2001·141 cites·8 claims
- 1597US5194854AMulticolor logic deviceHAVEL KAREL·Filed 1990·Granted Mar 16, 1993·207 cites·14 claims
- 1697US4965561AContinuously variable color optical deviceHAVEL KAREL·Filed 1989·Granted Oct 23, 1990·175 cites·6 claims
- 1797US4810937AMulticolor optical deviceHAVEL KAREL·Filed 1987·Granted Mar 7, 1989·148 cites·2 claims
- 1897US4794383AVariable color digital multimeterHAVEL KAREL·Filed 1986·Granted Dec 27, 1988·159 cites·10 claims
- 1997US4771274AVariable color digital display deviceHAVEL KAREL·Filed 1986·Granted Sep 13, 1988·207 cites·3 claims
- 2097US4705406AElectronic timepiece with physical transducerHAVEL KAREL·Filed 1986·Granted Nov 10, 1987·187 cites·11 claims
- 2197US4687340AElectronic timepiece with transducersHAVEL KAREL·Filed 1986·Granted Aug 18, 1987·187 cites·10 claims
- 2295US6577287B2Dual variable color display deviceTEXAS DIGITAL SYSTEMS INC·Filed 2001·Granted Jun 10, 2003·44 cites·5 claims
- 2395US6310590B1Method for continuously controlling color of display deviceTEXAS DIGITAL SYSTEMS INC·Filed 1999·Granted Oct 30, 2001·135 cites·9 claims
- 2495US4845745ADisplay telephone with transducerHAVEL KAREL·Filed 1988·Granted Jul 4, 1989·183 cites·12 claims
- 2592US6133722AVariable color digital measuring and testing system with error memoryTEXAS DIGITAL SYSTEMS INC·Filed 1999·Granted Oct 17, 2000·49 cites·6 claims
- 2691US6734837B1Variable color display system for comparing exhibited value with limitTEXAS DIGITAL SYSTEMS INC·Filed 1999·Granted May 11, 2004·53 cites·20 claims
- 2791US4702615AAnalog display timepieceHAVEL KAREL·Filed 1987·Granted Oct 27, 1987·74 cites·9 claims
- 2890US4734619ADisplay device with variable color backgroundHAVEL KAREL·Filed 1986·Granted Mar 29, 1988·68 cites·5 claims
- 2989US4086514AVariable color display deviceHAVEL KAREL·Filed 1976·Granted Apr 25, 1978·49 cites·3 claims
- 3075US6239776B1Multicolor multi-element display systemTEXAS DIGITAL SYSTEMS INC·Filed 1998·Granted May 29, 2001·17 cites·6 claims
- 3175US4868496AVariable color comparison oscilloscopeHAVEL KAREL·Filed 1988·Granted Sep 19, 1989·25 cites·8 claims
- 3273US6300923B1Continuously variable color optical deviceTEXAS DIGITAL SYSTEMS INC·Filed 1998·Granted Oct 9, 2001·15 cites·4 claims
- 3372US4812744AVariable color analog voltmeterHAVEL KAREL·Filed 1986·Granted Mar 14, 1989·22 cites·12 claims
- 3470US6219014B1Variable color display device having display area and background areaTEXAS DIGITAL SYSTEMS INC·Filed 1998·Granted Apr 17, 2001·20 cites·2 claims
- 3569US4754202AMulticolor comparison displayHAVEL KAREL·Filed 1986·Granted Jun 28, 1988·19 cites·6 claims
- 3668US6690343B2Display device with variable color background for evaluating displayed valueTEXAS DIGITAL SYSTEMS INC·Filed 2001·Granted Feb 10, 2004·4 cites·21 claims
- 3768US4726059AVariable color display telephoneHAVEL KAREL·Filed 1986·Granted Feb 16, 1988·25 cites·12 claims
- 3867US6147483AVariable color digital voltmeter with analog comparatorTEXAS DIGITAL SYSTEMS INC·Filed 1999·Granted Nov 14, 2000·18 cites·8 claims
- 3965US4785432ADigital display timepieceHAVEL KAREL·Filed 1987·Granted Nov 15, 1988·20 cites·3 claims
- 4064US4692612ASwitch position detector and indicator with multicolor light emitterHAVEL KAREL·Filed 1986·Granted Sep 8, 1987·13 cites·14 claims
- 4163US6121767ADigital multimeter with variable color range indicationFiled 1999·Granted Sep 19, 2000·10 cites·8 claims
- 4262US4797651AMulticolor comparator of digital signalsHAVEL KAREL·Filed 1986·Granted Jan 10, 1989·15 cites·19 claims
- 4361US4831326ADigital voltmeter with variable color backgroundHAVEL KAREL·Filed 1986·Granted May 16, 1989·17 cites·2 claims
- 4461US4775335AElectrical connectorHAVEL KAREL·Filed 1987·Granted Oct 4, 1988·20 cites·4 claims
- 4555US6424327B2Multicolor display element with enable inputTEXAS DIGITAL SYSTEMS INC·Filed 1999·Granted Jul 23, 2002·7 cites·2 claims
- 4655US5561365ADigital color display systemHAVEL KAREL·Filed 1995·Granted Oct 1, 1996·11 cites·3 claims
- 4755US4791667AFirst dialed digit detector and comparatorHAVEL KAREL·Filed 1987·Granted Dec 13, 1988·14 cites·2 claims
- 4853US6414662B1Variable color complementary display device using anti-parallel light emitting diodesTEXAS DIGITAL SYSTEMS INC·Filed 1999·Granted Jul 2, 2002·17 cites·12 claims
- 4952US6166710AVariable color display system for sequentially exhibiting digital valuesTEXAS DIGITAL SYSTEMS INC·Filed 1999·Granted Dec 26, 2000·6 cites·24 claims
- 5052US4804890AVariable color complementary display deviceHAVEL KAREL·Filed 1986·Granted Feb 14, 1989·16 cites·6 claims
Showing the top 50 of 59 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →