Assignee
CURTIS INSTR
US·45 granted patents·7 pending applications·1,853 citations·filing 1975–2025
Top patents by PatentIndex Score
52 records- 0199US5451881AMethod and means for adjusting battery monitor based on rate of current drawn from the batteryCURTIS INSTR·Filed 1994·Granted Sep 19, 1995·297 cites·16 claims
- 0299US4514694AQuiescent battery testing method and apparatusCURTIS INSTR·Filed 1982·Granted Apr 30, 1985·272 cites·32 claims
- 0395US4560937ABattery state of charge metering method and apparatusCURTIS INSTR·Filed 1981·Granted Dec 24, 1985·96 cites·24 claims
- 0494US4460870AQuiescent voltage sampling battery state of charge meterCURTIS INSTR·Filed 1981·Granted Jul 17, 1984·89 cites·33 claims
- 0594US4193026AMethod and apparatus for measuring the state of charge of a battery by monitoring reductions in voltageCURTIS INSTR·Filed 1978·Granted Mar 11, 1980·144 cites·129 claims
- 0693US4012681ABattery control system for battery operated vehiclesCURTIS INSTR·Filed 1975·Granted Mar 15, 1977·162 cites·7 claims
- 0790US4186339AMethod and apparatus for measuring current, especially useful in multi-ampere systemsCURTIS INSTR·Filed 1978·Granted Jan 29, 1980·46 cites·13 claims
- 0890US4017724AApparatus for measuring battery depletion by monitoring reductions in voltageCURTIS INSTR·Filed 1975·Granted Apr 12, 1977·43 cites·9 claims
- 0989US6611116B2Anti-spin control for a separately excited motor drive systemCURTIS INSTR·Filed 2001·Granted Aug 26, 2003·76 cites·49 claims
- 1089US6439067B1Shaft sensor assembly for angular velocity, torque, and powerCURTIS INSTR·Filed 2001·Granted Aug 27, 2002·56 cites·8 claims
- 1189USD387333SHeatsink enclosure for an electrical controllerCURTIS INSTR·Filed 1995·Granted Dec 9, 1997·52 cites·1 claims
- 1288US4626750ASolid state d.c. motor controlCURTIS INSTR·Filed 1985·Granted Dec 2, 1986·59 cites·18 claims
- 1388US4388618ABattery state of charge indicator operating on bidirectional integrations of terminal voltageCURTIS INSTR·Filed 1981·Granted Jun 14, 1983·48 cites·18 claims
- 1480US4712195ASolid-state cumulative operations measurement systemCURTIS INSTR·Filed 1986·Granted Dec 8, 1987·27 cites·26 claims
- 1578US5247253AEddy current proximity sensing means and method useful for determining throttle positionCURTIS INSTR·Filed 1990·Granted Sep 21, 1993·43 cites·15 claims
- 1675US10386936B2Power wheelchair hand control with dual configurable keypadsCURTIS INSTR·Filed 2017·Granted Aug 20, 2019·5 cites·17 claims
- 1775US7898203B2Systems and methods for dynamically compensating motor resistance in electric motorsCURTIS INSTR·Filed 2008·Granted Mar 1, 2011·10 cites·23 claims
- 1872US2025317063A1Stabilization of dc-to-dc converterCURTIS INSTR·Filed 2025·Application pending·0 cites
- 1971US6456043B1Method of diagnosing the state of health of a batteryCURTIS INSTR·Filed 2001·Granted Sep 24, 2002·22 cites·5 claims
- 2071US4728923ASteerable wheel direction indicatorCURTIS INSTR·Filed 1987·Granted Mar 1, 1988·25 cites·15 claims
- 2170US6362601B1Method of battery charge restoration based on estimated battery plate deterioration and/or based on battery state of healthCURTIS INSTR·Filed 2000·Granted Mar 26, 2002·22 cites·9 claims
- 2267US12083908B2Magnetic charger connector for wheelchairCURTIS INSTR·Filed 2022·Granted Sep 10, 2024·0 cites·20 claims
- 2364US6208245B1Engine oil change indicator systemCURTIS INSTR·Filed 1999·Granted Mar 27, 2001·23 cites·11 claims
- 2464US2024313690A1Multi-blade motor control by single power stageCURTIS INSTR·Filed 2024·Application pending·0 cites
- 2562US4740754ABidirectional battery state-of-charge monitorCURTIS INSTR·Filed 1986·Granted Apr 26, 1988·32 cites·35 claims
- 2661US11491884B2Magnetic charger connector for wheelchairCURTIS INSTR·Filed 2019·Granted Nov 8, 2022·1 cites·20 claims
- 2760US4139896AMethod and apparatus for producing nonlinear integral functionsCURTIS INSTR·Filed 1976·Granted Feb 13, 1979·12 cites·16 claims
- 2858US5202682AData encodement and reading method and apparatusCURTIS INSTR·Filed 1991·Granted Apr 13, 1993·18 cites·28 claims
- 2958USD288791SBattery state-of-charge meterCURTIS INSTR·Filed 1983·Granted Mar 17, 1987·11 cites·1 claims
- 3057US6380716B1Condition monitoring of opportunity charged batteriesCURTIS INSTR·Filed 2000·Granted Apr 30, 2002·11 cites·14 claims
- 3157US5261025AMethod and apparatus for DC motor speed controlCURTIS INSTR·Filed 1989·Granted Nov 9, 1993·19 cites·15 claims
- 3257US4724332ASynchronous load lock-out control system for battery powered equipmentCURTIS INSTR·Filed 1985·Granted Feb 9, 1988·27 cites·15 claims
- 3356US12311956B2Grade severity detectionCURTIS INSTR·Filed 2022·Granted May 27, 2025·0 cites·17 claims
- 3456US4288734ABidirectional integratorCURTIS INSTR·Filed 1979·Granted Sep 8, 1981·19 cites·9 claims
- 3555US2004143511A1Method and apparatus for web-based configuration of instrumentation, and business methods employing sameCURTIS INSTR·Filed 2003·Application pending·0 cites
- 3654US2024268265A1Braking of a motor during a battery disconnectCURTIS INSTR·Filed 2024·Application pending·0 cites
- 3750US6181106B1Sequential high-rate charging of battery cellsCURTIS INSTR·Filed 1997·Granted Jan 30, 2001·24 cites·28 claims
- 3848US9698453B2Adjustable length battery electrolyte probeCURTIS INSTR·Filed 2014·Granted Jul 4, 2017·0 cites·16 claims
- 3947US5374881AElectric motor controllerCURTIS INSTR·Filed 1992·Granted Dec 20, 1994·18 cites·14 claims
- 4045US6202039B1Compact, low-cost semiconductor device for receiving arbitrary input parameters and driving selected display devices, and methodsCURTIS INSTR·Filed 1997·Granted Mar 13, 2001·15 cites·6 claims
- 4144US4006415AFast reset integratorCURTIS INSTR·Filed 1975·Granted Feb 1, 1977·6 cites·17 claims
- 4240US12562733B2Power MOSFET driving circuit with transfer curve gate driver and ground shift compensationCURTIS INSTR·Filed 2023·Granted Feb 24, 2026·0 cites·20 claims
- 4339US6622069B1Automatic motor adjustment for differentially steered dual electric motor systemCURTIS INSTR·Filed 2002·Granted Sep 16, 2003·3 cites·54 claims
- 4438US3992668AElectro-thermal readout of coulometersCURTIS INSTR·Filed 1975·Granted Nov 16, 1976·4 cites·16 claims
- 4537US4852104ASolid-state reader device for a cumulative operations measurement systemCURTIS INSTR·Filed 1987·Granted Jul 25, 1989·7 cites·21 claims
- 4636US4192009ACoulometric device for performing time integrationCURTIS INSTR·Filed 1978·Granted Mar 4, 1980·2 cites·10 claims
- 4735US3992667AElectro-thermal readout coulometerCURTIS INSTR·Filed 1975·Granted Nov 16, 1976·3 cites·14 claims
- 4835US2009084617A1Integrated reminder function in a personal mobility vehicle, such as a wheelchairCURTIS INSTR·Filed 2007·Application pending·0 cites
- 4933US10904762B2Powered wheelchair remote diagnosticsCURTIS INSTR·Filed 2019·Granted Jan 26, 2021·0 cites·21 claims
- 5033US2022236760A1Joystick with Adjustable Operating Force for Electrical Wheelchair DevicesCURTIS INSTR·Filed 2021·Application pending·0 cites
Showing the top 50 of 52 patent records by PatentIndex Score.
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