Inventor · disambiguated record
Richard D. Campbell
Also filed as: CAMPBELL II RICHARD · CAMPBELL RICHARD D
8 granted patents·73 citations·filing 1973–2003
85Inventor score
Top patents by PatentIndex Score
8 records- 0174US4320881AFail-safe decoder for digital track circuitsAMERICAN STANDARD INC·Filed 1980·Granted Mar 23, 1982·29 cites·13 claims
- 0264US6885307B2Battery monitorTARMA LLC·Filed 2003·Granted Apr 26, 2005·20 cites·38 claims
- 0344US4763017AElectronic bipolar interface circuitAMERICAN STANDARD INC·Filed 1985·Granted Aug 9, 1988·7 cites·18 claims
- 0442US4306695ANon-linear filterAMERICAN STANDARD INC·Filed 1979·Granted Dec 22, 1981·5 cites·11 claims
- 0536US6021576ATrailer trammelFiled 1998·Granted Feb 8, 2000·8 cites·1 claims
- 0635US3950690AFail-safe reference voltage sourceWESTINGHOUSE AIR BRAKE CO·Filed 1973·Granted Apr 13, 1976·3 cites·10 claims
- 0730US4661722AFail-safe pulse coincidence detectorAMERICAN STANDARD INC·Filed 1984·Granted Apr 28, 1987·1 cites·9 claims
- 0827US4328541AFail-safe digital comparatorAMERICAN STANDARD INC·Filed 1980·Granted May 4, 1982·0 cites·12 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →