Inventor
ARNDT OTTO
21 patents
Patents
21 patentsUS5616779AApr 1, 1997
Process for the preparation of 2,5-di-phenylamino-terephthalic acid and its dialkyl esters
HOECHST AG13 citations73
US5599992AFeb 4, 1997
Process for the preparation of 2-fluorophenylhydrazine
HOECHST AG7 citations73
US4613698ASep 23, 1986
Process for the preparation of 6-chloro-2,4-dinitroaniline
HOECHST AG10 citations73
US5208365AMay 4, 1993
Process for the preparation of 2,5-di(phenylamino)-terephthalic acid and its dialkyl esters in high purity
HOECHST AG10 citations72
US4246196AJan 20, 1981
Diaminophenyl ureas
HOECHST AG8 citations72
US5559257ASep 24, 1996
Process for the preparation of tetrachloro-1,4-benzoquinone
HOECHST AG2 citations62
US5151532ASep 29, 1992
Process for the production of high-purity tetrachloro-1,4-benzoquinone
HOECHST AG4 citations62
US5149850ASep 22, 1992
Process for the production of high-purity tetrachloro-1,4-benzoquinone
HOECHST AG5 citations62
US4658034AApr 14, 1987
Process for the preparation of 2,6-dichlorobenzoxazole
HOECHST AG6 citations62
US4605767AAug 12, 1986
Process for the preparation of 2,6-dichloro-4-nitroaniline
HOECHST AG3 citations62
US4540832ASep 10, 1985
Process for the preparation of 6-chloro-2,4-dinitrophenol
HOECHST AG3 citations62
US4487725ADec 11, 1984
Process for the preparation of N-acetylaminoarylsulfonic acids in sulfuric acid as solvent
HOECHST AG2 citations62
US4254054AMar 3, 1981
Process for the manufacture of 4-nitro-4'-amino-diphenylamine-2-sulfonic acid and 2-nitro-4'-amino-diphenylamine-4-sulfonic acid
HOECHST AG3 citations62
US4242275ADec 30, 1980
Process for the preparation of isomer-free toluene-4-sulfonic acid
HOECHST AG3 citations62
US5347038ASep 13, 1994
Process of the preparation of 2,5-di-phenylamino-terephthalic acid and its dialkyl esters in a high purity
HOECHST AG3 citations61
US4908478AMar 13, 1990
Single-vessel process for preparing 2-acetaminonaphthalene-6-sulfonic acid of high purity
HOECHST AG1 citations52
US4552970ANov 12, 1985
Solvated salts of dinitrophenylcyanamides, and a process for the preparation thereof
HOECHST AG1 citations52
US5451699ASep 19, 1995
Process for the preparation of crystalline, salt-free, chlorine-substituted 3-nitrobenzenesulfonic acid hydrates
HOECHST AG0 citations51
US4316861AFeb 23, 1982
N-Nitroaryl-N-halosulfonyl ureas
HOECHST AG0 citations51
US4824962AApr 25, 1989
Process for the preparation of naphthostyril
HOECHST AG0 citations41
US5525744AJun 11, 1996
Process for the preparation of tetrachloro-1,4-benzoquinone
HOECHST AG0 citations40