Inventor
RITTNER SIEGBERT
DE25 patents
⚠️ This page may combine multiple inventors who share the name “RITTNER SIEGBERT”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HOECHST AG
22 patentsUS5028736AJul 2, 1991
Process for the separation and recovery of naphthalene-sulfonic acids from aqueous solutions
HOECHST AG20 citations78
US5152875AOct 6, 1992
Separation of m- and p-dichlorobenzene
HOECHST AG7 citations73
US4916257AApr 10, 1990
Process for the purification of 2-hydroxynaphthalene-6-carboxylic acid
HOECHST AG6 citations71
US4683034AJul 28, 1987
Process for separating dimethyl isophthalate and dimethyl orthophthalate from their mixture with dimethyl terephthalate
HOECHST AG10 citations69
US5419815AMay 30, 1995
Process for purifying fatty acid amides
HOECHST AG9 citations66
US5447541ASep 5, 1995
Process for separating and purifying substances by crystallization from the melt under high pressure
HOECHST AG6 citations63
US5447542ASep 5, 1995
Process for separating and purifying substances by crystallization from the melt
HOECHST AG4 citations63
US5013444AMay 7, 1991
Process for separating off enol ethers from reaction mixtures containing alcohols
HOECHST AG3 citations62
US5543564AAug 6, 1996
Process for releasing acidic organic compounds from salts thereof by carbon dioxide
HOECHST AG2 citations61
US4617197AOct 14, 1986
Process for improving the wetting characteristics of the surface of shaped plastics articles for applications in chemical engineering
HOECHST AG6 citations61
US5808142ASep 15, 1998
Process for the preparation of 2-hydroxynaphthalene-6-carboxylic acid
HOECHST AG2 citations59
US5643494AJul 1, 1997
Process for the preparation of aromatic hydroxy carboxylic acids
HOECHST AG2 citations59
US5532406AJul 2, 1996
Process for preparing aromatic hydroxycarboxylic acids
HOECHST AG3 citations59
US5401859AMar 28, 1995
Process for the preparation of pure trioxane
HOECHST AG2 citations59
US5312976AMay 17, 1994
Process for the preparation of 2-hydroxy-naphthalene-6-carboxylic acid
HOECHST AG2 citations57
US4923485AMay 8, 1990
Process for separating organic constituents from waste gases of the production of aromatic intermediates
HOECHST AG5 citations56
US4918225AApr 17, 1990
Process for the preparation of pure crotonic acids
HOECHST AG5 citations55
US4814518AMar 21, 1989
Process for extracting nitrohydroxyaromatics from aqueous solutions
HOECHST AG4 citations54
US5047558ASep 10, 1991
Process for the preparation of a dioxane adduct of 2-hydroxynaphthalene-6-carboxylic acid
HOECHST AG0 citations51
US4925959AMay 15, 1990
Dioxane adduct of 2-hydroxynaphthalene-6-carboxylic acid and process for the preparation thereof
HOECHST AG0 citations51
US4864065ASep 5, 1989
Process for removing halogenated hydroxyaromatics from aqueous solutions
HOECHST AG0 citations45
US5081263AJan 14, 1992
Dioxane adducts of aromatic meta- or para-hydroxy-carboxlic acids
HOECHST AG1 citations42