Inventor · disambiguated record
Donald J. Butterworth
Also filed as: BUTTERWORTH DONALD · BUTTERWORTH DONALD J · BUTTERWORTH DONALD JAMES
11 granted patents·3 pending applications·211 citations·filing 1977–2017
91Inventor score
Top patents by PatentIndex Score
14 records- 0185US4880513AMethod and apparatus for generating acid and base regenerants and the use thereof to regenerate ion-exchange resinsGRAVER CO·Filed 1986·Granted Nov 14, 1989·57 cites·73 claims
- 0278US4707257AAir/water distributor underdrainGRAVER CO·Filed 1986·Granted Nov 17, 1987·44 cites·25 claims
- 0370US4858075ARF shielded and electrically insulated circuit board structure and method of making sameBELL OF PENNSYLVANIA·Filed 1987·Granted Aug 15, 1989·28 cites·6 claims
- 0460US5250159ABipolar membrane stack and method for producing acid and monovalent base from impure saltGRAVER CO·Filed 1991·Granted Oct 5, 1993·24 cites·7 claims
- 0559US4269707AApparatus and methodECODYNE CORP·Filed 1979·Granted May 26, 1981·16 cites·5 claims
- 0657US11022012B2Fluid method and systemCASTROL LTD·Filed 2016·Granted Jun 1, 2021·1 cites·25 claims
- 0753US4210537ALiquid treatment apparatusECODYNE CORP·Filed 1978·Granted Jul 1, 1980·14 cites·8 claims
- 0850US5207879ABipolar membrane stack and method for production of low chloride sodium hydroxideGRAVER CO·Filed 1991·Granted May 4, 1993·8 cites·11 claims
- 0950US4174282ALiquid treatment apparatusECODYNE CORP·Filed 1978·Granted Nov 13, 1979·12 cites·10 claims
- 1037US4116840ALiquid treatment apparatusECODYNE CORP·Filed 1977·Granted Sep 26, 1978·4 cites·7 claims
- 1131US4777644AMethod and apparatus for testing telephone coin relaysBELL OF PENNSYLVANIA·Filed 1987·Granted Oct 11, 1988·3 cites·31 claims
- 1231US2018080353A1Fluid Method and SystemCASTROL LTD·Filed 2017·Application pending·0 cites
- 1331US2018087418A1Fluid Method and SystemCASTROL LTD·Filed 2017·Application pending·0 cites
- 1424US2018258806A1Fluid Method and SystemBUTTERWORTH DONALD·Filed 2016·Application pending·0 cites
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →