Inventor · disambiguated record
Herbert Helfert
Also filed as: HELFERT HERBERT · PERNER JOHANNES
18 granted patents·255 citations·filing 1974–2001
94Inventor score
Top patents by PatentIndex Score
18 records- 0194US4052159ADyeing process using quaternary ammonium salt as retarderBASF AG·Filed 1976·Granted Oct 4, 1977·79 cites·6 claims
- 0285US4031112ACyclic acetalsBASF AG·Filed 1976·Granted Jun 21, 1977·15 cites·3 claims
- 0380US4061684AHighly branched polyether polyols of high molecular weightBASF WYANDOTTE CORP·Filed 1976·Granted Dec 6, 1977·25 cites·5 claims
- 0479US6703511B2Method for obtaining pure n-vinyl pyrrolidoneBASF AG·Filed 2001·Granted Mar 9, 2004·9 cites·8 claims
- 0578US4275244ALinear polyalkylene ether glycols of high molecular weightBASF WYANDOTTE CORP·Filed 1979·Granted Jun 23, 1981·22 cites·2 claims
- 0672US4207199ASolid cold bleach activators for detergents and cleaning agents containing an active oxygen donorBASF AG·Filed 1978·Granted Jun 10, 1980·26 cites·3 claims
- 0770US5710284APurification of N-vinylpyrrolidone by crystallizationBASF AG·Filed 1996·Granted Jan 20, 1998·14 cites·8 claims
- 0865US4294576ARemoval of oligomer deposits from textile materialsBASF AG·Filed 1980·Granted Oct 13, 1981·13 cites·10 claims
- 0960US4614604ALubricants for shaping polyvinyl chloride, which contain esterified oligomeric polyhydric alcoholsBASF AG·Filed 1985·Granted Sep 30, 1986·15 cites·8 claims
- 1060US3963714AQuaternary ammonium saltsBASF AG·Filed 1974·Granted Jun 15, 1976·9 cites·11 claims
- 1150US4113785APolyether polyols and method of preparing sameBASF WYANDOTTE CORP·Filed 1976·Granted Sep 12, 1978·10 cites·10 claims
- 1242US6888006B2Method for processing pyrollidone and n-vinyl pyrollidone residuesBASF AG·Filed 2001·Granted May 3, 2005·0 cites·7 claims
- 1342US5723685APreparation of monovinyl ethersBASF AG·Filed 1995·Granted Mar 3, 1998·2 cites·6 claims
- 1439US4151127AProcess for suppressing the foaming of detergentsBASF AG·Filed 1978·Granted Apr 24, 1979·6 cites·2 claims
- 1537US3945794AProduction of level dyeings on acrylonitrile polymer fibers with basic dyesBASF AG·Filed 1974·Granted Mar 23, 1976·5 cites·5 claims
- 1636US5461159ABinding chemical impurities contained in crude N-vinylpyrrolid-2-oneBASF AG·Filed 1995·Granted Oct 24, 1995·4 cites·3 claims
- 1735US5948945APrevention of spontaneous decomposition of gaseous acetyleneBASF AG·Filed 1998·Granted Sep 7, 1999·1 cites·20 claims
- 1827US4006093ASurfactants containing iodineBASF AG·Filed 1974·Granted Feb 1, 1977·0 cites·4 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →