Inventor · disambiguated record
Richard A. Wittren
Also filed as: WITTREN RICHARD A · WITTREN RICHARD ARTHUR
12 granted patents·163 citations·filing 1975–1986
92Inventor score
Files withDEERE & CO12
Top patents by PatentIndex Score
12 records- 0178US4556078APriority valveDEERE & CO·Filed 1984·Granted Dec 3, 1985·31 cites·11 claims
- 0275US4541451APriority valveDEERE & CO·Filed 1984·Granted Sep 17, 1985·21 cites·11 claims
- 0374US3995425ADemand compensated hydraulic system with pilot line pressure-maintaining valveDEERE & CO·Filed 1976·Granted Dec 7, 1976·22 cites·6 claims
- 0458US4170113AHydraulic system with unloading valve assemblyDEERE & CO·Filed 1978·Granted Oct 9, 1979·11 cites·8 claims
- 0556US4405030ASteering system and compensating valveDEERE & CO·Filed 1981·Granted Sep 20, 1983·14 cites·9 claims
- 0656US4367803ASteering systemDEERE & CO·Filed 1981·Granted Jan 11, 1983·14 cites·10 claims
- 0755US4640094AFlow amplifying steering systemDEERE & CO·Filed 1986·Granted Feb 3, 1987·16 cites·21 claims
- 0853US4463775ACompensating valveDEERE & CO·Filed 1984·Granted Aug 7, 1984·12 cites·8 claims
- 0946US3986438AHydraulic cylinder with integral feedback cylinderDEERE & CO·Filed 1975·Granted Oct 19, 1976·7 cites·11 claims
- 1040US4209984AHydraulic system with unloading valve assemblyDEERE & CO·Filed 1978·Granted Jul 1, 1980·5 cites·6 claims
- 1140US4066099AZero lap valveDEERE & CO·Filed 1976·Granted Jan 3, 1978·6 cites·18 claims
- 1235US4038886AForward, neutral and reverse V-belt planetary driveDEERE & CO·Filed 1976·Granted Aug 2, 1977·4 cites·4 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →