Inventor · disambiguated record
Klaus-Dieter Steffen
Also filed as: ENGLAENDER FRITZ · STEFFEN KLAUS D · STEFFEN KLAUS-DIETER
29 granted patents·601 citations·filing 1972–1998
96Inventor score
Top patents by PatentIndex Score
29 records- 0197US3946059AMethod of preparing alkylalkoxysilanes containing polysulfide bridgesDYNAMIT NOBEL AG·Filed 1974·Granted Mar 23, 1976·87 cites·10 claims
- 0296US5334747AMethod of preparing substituted malonic ester anilides and malonic acid mono-anilidesHUELS CHEMISCHE WERKE AG·Filed 1992·Granted Aug 2, 1994·71 cites·8 claims
- 0396US5117027AProcess for the preparation of organosilanes containing methacryloyloxy or acryloyloxy groupsHUELS CHEMISCHE WERKE AG·Filed 1991·Granted May 26, 1992·240 cites·3 claims
- 0493US5886219AProcess for preparing malonic acid and alkylmalonic acidsHUELS CHEMISCHE WERKE AG·Filed 1998·Granted Mar 23, 1999·59 cites·10 claims
- 0587US4026827APreparation of high-molecular weight thermoplastic polyorganosilicic acid estersDYNAMIT NOBEL AG·Filed 1972·Granted May 31, 1977·30 cites·11 claims
- 0682US4297502AAromatic bisazomethines, a method for their preparation, and their use as reactive pigmentsDYNAMIT NOBEL AG·Filed 1980·Granted Oct 27, 1981·14 cites·12 claims
- 0777US4465865AMethod of preparing terephthalic aldehyde and isophthalic aldehydeDYNAMIT NOBEL AG·Filed 1982·Granted Aug 14, 1984·14 cites·9 claims
- 0875US4380632AMethod of preparing quinolines, naphthyridines and other nitrogen bi-heterocyclic compoundsDYNAMIT NOBEL AG·Filed 1981·Granted Apr 19, 1983·9 cites·21 claims
- 0973US5508396AProcess for preparing n-alkyllactamsHUELS CHEMISCHE WERKE AG·Filed 1995·Granted Apr 16, 1996·17 cites·11 claims
- 1064US4211710AProcess of preparing 3-bromophthalideDYNAMIT NOBEL AG·Filed 1978·Granted Jul 8, 1980·4 cites·9 claims
- 1162US5399778AProcess for the preparation of ketalsHUELS CHEMISCHE WERKE AG·Filed 1993·Granted Mar 21, 1995·7 cites·8 claims
- 1262US3963739A3-Amino-4,5,6-trichloro-7-nitriloindazolesDYNAMIT NOBEL AG·Filed 1975·Granted Jun 15, 1976·4 cites·3 claims
- 1359US5856542AProcess for preparing N,N'-disubstituted P-quinonediimines, their use and organosilanes containing methacryloxy or acryloxy groups, processes for their stabilization and their preparationHUELS CHEMISCHE WERKE AG·Filed 1995·Granted Jan 5, 1999·7 cites·30 claims
- 1459US5463111AProcess for preparing dialkyl 2-haloethyl malonatesHUELS CHEMISCHE WERKE AG·Filed 1994·Granted Oct 31, 1995·5 cites·8 claims
- 1555US5510509APreparation of esters of cyclopropane-1,1-dicarboxylic acidHUELS CHEMISCHE WERKE AG·Filed 1994·Granted Apr 23, 1996·5 cites·1 claims
- 1655US4322554APolymeric azomethinesDYNAMIT NOBEL AG·Filed 1980·Granted Mar 30, 1982·5 cites·2 claims
- 1754US5569780ADialkyl 2-haloethyl malonatesHUELS CHEMISCHE WERKE AG·Filed 1995·Granted Oct 29, 1996·4 cites·1 claims
- 1853US5101043AProcess for the preparation of 3-carboxamido-5-vinyl-2-pyrrolidoneHUELS CHEMISCHE WERKE AG·Filed 1991·Granted Mar 31, 1992·4 cites·4 claims
- 1949US4216153AMethod of preparing phthalideDYNAMIT NOBEL AG·Filed 1978·Granted Aug 5, 1980·2 cites·1 claims
- 2047US5041619AProcess for the preparation of alkoxyalkylidenemalonic acid estersHUELS CHEMISCHE WERKE AG·Filed 1990·Granted Aug 20, 1991·4 cites·14 claims
- 2142US5849949AProcess for preparing alkyl- and arylmalonic acidsHUELS CHEMISCHE WERKE AG·Filed 1998·Granted Dec 15, 1998·2 cites·11 claims
- 2242US3981936AMethod for the preparation of bis-(bromomethyl)-tetrachlorobenzenes and their use as flame-proofing agentsDYNAMIT NOBEL AG·Filed 1974·Granted Sep 21, 1976·3 cites·11 claims
- 2338US6147239AProcess for preparing n, n'-disubstituted p-quinonediimines, their use and organosilanes containing methacryloxy or acryloxy groups, processes for their stabilization and their preparationHUELS CHEMISCHE WERKE AG·Filed 1998·Granted Nov 14, 2000·1 cites·9 claims
- 2432US6143920AProcess for the preparation of methoxyacetic acid estersHUELS CHEMISCHE WERKE AG·Filed 1998·Granted Nov 7, 2000·0 cites·17 claims
- 2532US5869737AProcess for the preparation of cyclopropane-1, 1-dicarboxylic acid derivativesHUELS CHEMISCHE WERKE AG·Filed 1997·Granted Feb 9, 1999·0 cites·14 claims
- 2632US4673751AMethod of preparing 3,4-dihydro-alpha-pyronesDYNAMIT NOBEL AG·Filed 1984·Granted Jun 16, 1987·0 cites·4 claims
- 2730US4371709AMethod of preparing oligomeric brominous xylylene bisphenol ethersDYNAMIT NOBEL AG·Filed 1980·Granted Feb 1, 1983·3 cites·15 claims
- 2830US4268698AMethod of preparing bis-(chloromethyl)-tetrachlorobenzenesDYNAMIT NOBEL AG·Filed 1979·Granted May 19, 1981·0 cites·13 claims
- 2924US4446327AProcess for the preparation of 3-chlorophthalideDYNAMIT NOBEL AG·Filed 1982·Granted May 1, 1984·0 cites·7 claims
Join the waitlist — get patent alerts
Get an alert when Klaus-Dieter Steffen files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →