Individual holder
WALKER FRANK H
11 granted patents·2 pending applications·300 citations·filing 1988–2009
Individually held — no corporate assignee on record.
Top patents by PatentIndex Score
13 records- 0195US5971092AVehicle drive system featuring split engine and accessory back driveWALKER FRANK H·Filed 1996·Granted Oct 26, 1999·80 cites·18 claims
- 0289US5263401AHydraulic regenerative braking and four wheel drive systemWALKER FRANK H·Filed 1992·Granted Nov 23, 1993·42 cites·16 claims
- 0383US4896749AEmergency vehicle braking system and method for using sameWALKER FRANK H·Filed 1988·Granted Jan 30, 1990·22 cites·17 claims
- 0481US5101925AHydraulic wheel motor and pumpWALKER FRANK H·Filed 1991·Granted Apr 7, 1992·53 cites·5 claims
- 0576US7562944B2Hydraulic regenerative braking system for a vehicleWALKER FRANK H·Filed 2003·Granted Jul 21, 2009·23 cites·19 claims
- 0671US5323688AHydraulic regenerative braking and four wheel drive systemWALKER FRANK H·Filed 1993·Granted Jun 28, 1994·35 cites·17 claims
- 0770US8176838B2Hydraulic machine arrangementWALKER FRANK H·Filed 2008·Granted May 15, 2012·3 cites·21 claims
- 0866US8162621B2Hydraulic machine arrangementWALKER FRANK H·Filed 2009·Granted Apr 24, 2012·4 cites·27 claims
- 0965US4883141AHydraulic wheel motor and pumpWALKER FRANK H·Filed 1988·Granted Nov 28, 1989·22 cites·6 claims
- 1056US8132868B2Hydraulic regenerative braking system for a vehicleWALKER FRANK H·Filed 2005·Granted Mar 13, 2012·3 cites·25 claims
- 1150US5000282AHydraulic wheel motor and pumpWALKER FRANK H·Filed 1989·Granted Mar 19, 1991·13 cites·15 claims
- 1249US2009236906A1Hydraulic Regenerative Braking System For A VehicleWALKER FRANK H·Filed 2009·Application pending·0 cites
- 1342US2008210500A1Hydraulic Regenerative Braking System For a VehicleWALKER FRANK H·Filed 2006·Application pending·0 cites
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →