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.
Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →