Inventor · disambiguated record
Dick J. Kolkman
Also filed as: KOLKMAN DICK J
5 granted patents·47 citations·filing 1976–1998
79Inventor score
Top patents by PatentIndex Score
5 records- 0163US4645148AFail-safe voltage-limiting circuit for an audio frequency overlay track circuitAMERICAN STANDARD INC·Filed 1985·Granted Feb 24, 1987·23 cites·16 claims
- 0256US4059845AFail-safe time delay circuitWESTINGHOUSE AIR BRAKE CO·Filed 1976·Granted Nov 22, 1977·9 cites·10 claims
- 0337US4099692ATransfer apparatus for energy sourcesWESTINGHOUSE AIR BRAKE CO·Filed 1977·Granted Jul 11, 1978·6 cites·10 claims
- 0434US4652986AVital inverter driverAMERICAN STANDARD INC·Filed 1986·Granted Mar 24, 1987·6 cites·20 claims
- 0529US6052050ATwo-wire signal transmitter and method for maintaining integrity of electrical contactsUNION SWITCH & SIGNAL INC·Filed 1998·Granted Apr 18, 2000·3 cites·13 claims
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