Inventor · disambiguated record
Wolfgang Rieper
Also filed as: RIEPER WOLFGANG
17 granted patents·113 citations·filing 1974–1992
93Inventor score
Files withHOECHST AG17
Top patents by PatentIndex Score
17 records- 0182US4080321AMonoazo pigments from diazotized acylamino-anilines and acetoacetylamino benzimidazolonesHOECHST AG·Filed 1976·Granted Mar 21, 1978·12 cites·9 claims
- 0276US3974136AModified form of a disazo pigmentHOECHST AG·Filed 1974·Granted Aug 10, 1976·8 cites·1 claims
- 0372US5243032APreparation of azo pigments with low pcb content by coupling in the presence of olefinsHOECHST AG·Filed 1990·Granted Sep 7, 1993·12 cites·11 claims
- 0471US3985725AQuinolino-azo-aceto-acetylaminobenzimidazolone pigments fast to heatHOECHST AG·Filed 1975·Granted Oct 12, 1976·7 cites·5 claims
- 0570US5070159AAddition compounds, a process for the preparation, and their use, based on epoxy novolac-fatty amine adductsHOECHST AG·Filed 1989·Granted Dec 3, 1991·11 cites·15 claims
- 0669US5086168AMonoazo pigments derived from diazotized di- or trichloroanilines, preparation thereof and their useHOECHST AG·Filed 1990·Granted Feb 4, 1992·10 cites·16 claims
- 0768US4476052AAzo pigment having improved hiding power and a process for its preparationHOECHST AG·Filed 1982·Granted Oct 9, 1984·8 cites·18 claims
- 0867US4124582AProcess for the purification of azo pigments by stirring an aqueous, alkaline suspension of crude pigmentHOECHST AG·Filed 1975·Granted Nov 7, 1978·6 cites·6 claims
- 0962US4631330AAddition compounds and process for their preparationHOECHST AG·Filed 1985·Granted Dec 23, 1986·14 cites·10 claims
- 1059US5066687APowdered azo pigments with improved rheological properties, process for their preparation and their useHOECHST AG·Filed 1990·Granted Nov 19, 1991·7 cites·12 claims
- 1152US5266110ACrystal modification of C.I. Pigment Yellow 16HOECHST AG·Filed 1992·Granted Nov 30, 1993·5 cites·14 claims
- 1252US3980635ANovel form of the disazo pigment from bisdiazotized 3,3'-dichlorobenzidine and 1-(p-tolyl)-3-methylpyrazol-5-oneHOECHST AG·Filed 1975·Granted Sep 14, 1976·3 cites·1 claims
- 1351US5194597APreparation of a coupling product of bisiazotized 2,2',5,5'-tetrachloro-4,4'-diaminobiphenyl with two equivalents of n-acetoacetyl-2,4-dimethylanilideHOECHST AG·Filed 1991·Granted Mar 16, 1993·4 cites·4 claims
- 1444US4720541AProcess for improving the application properties of disazo pigmentsHOECHST AG·Filed 1984·Granted Jan 19, 1988·2 cites·8 claims
- 1543US4048152AModified form of disazo pigment CI 20040HOECHST AG·Filed 1975·Granted Sep 13, 1977·2 cites·1 claims
- 1637US4410707AProcess for the manufacture of 3-amino-1-phenylpyrazol-5-oneHOECHST AG·Filed 1981·Granted Oct 18, 1983·1 cites·11 claims
- 1736US4589921AProcess for improving the application properties of pigment yellow 13HOECHST AG·Filed 1985·Granted May 20, 1986·1 cites·8 claims
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