Patents by Inventor Udo Rudolph

Udo Rudolph has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Ion exchangers modified with mercapto amines
    Patent number: 5284981
    Abstract: This invention relates to a catalyst modified with mercapto amines, its preparation and its use for the preparation of bisphenols.
    Type: Grant
    Filed: May 1, 1990
    Date of Patent: February 8, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Udo Rudolph, Norbert Bachem, Claus Wulff
  • Ion exchange modified with mercapto amines
    Patent number: 5212206
    Abstract: This invention relates to a catalyst modified with mercapto amines, its preparation and its use for the preparation of bisphenols.
    Type: Grant
    Filed: February 8, 1990
    Date of Patent: May 18, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Udo Rudolph, Norbert Bachem, Claus Wulff
  • Process for the vacuum distillation of crude cyanohydrins containing 3 to 6 carbon atoms using liquid jet pump
    Patent number: 5091555
    Abstract: A process for the purification of crude cyanohydrins which contain 3 to 6 carbon atoms, especially of crude acetone cyanohydrin, by distilling off the unreacted reactants namely hydrogen cyanide and the carbonyl compound. The purification becomes very simple, and the unreacted reactants can be fed directly into the cyanohydrin synthesis, when the vacuum is generated with a liquid jet pump. The exhaust vapors arising in the distillation or desorption are led into the driving jet of the pump, the liquid jet pump is driven with crude cyanohydrin which contains basic catalyst, and the exhaust vapors absorbed in the crude cyanohydrin are reacted to completion in a cooled reaction circuit in which the liquid jet pump is incorporated.
    Type: Grant
    Filed: October 5, 1990
    Date of Patent: February 25, 1992
    Assignee: Degussa AG
    Inventors: Wolfgang Buder, Udo Rudolph
  • Isomerization of bisphenols
    Patent number: 5015784
    Abstract: This invention relates to a process for the preparation of bisphenols and bisphenol mixtures by the isomerization of bisphenols on acid or alkaline catalysts in the presence of the corresponding phenols.
    Type: Grant
    Filed: August 3, 1989
    Date of Patent: May 14, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Udo Rudolph, Claus Wulff
  • Ionic exchangers modified with thiazolines
    Patent number: 4912263
    Abstract: This invention relates to an ionic exchanger modified with thiazolines, to its preparation and to its use for the preparation of condensation products, particularly bisphenols.
    Type: Grant
    Filed: August 9, 1988
    Date of Patent: March 27, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Udo Rudolph, Claus Wulff, Jurgen Hinz, Norbert Bachem
  • Process for the preparation of polyphosphonic acid amides
    Patent number: 4701554
    Abstract: The invention relates to a process for the preparation of polyphosphonic acid amides by condensation of 0.5-2 moles of a phosphonic acid diaryl ester and 1 mole of an aliphatic, aromatic, araliphatic or heterocyclic primary or secondary diamine in the melt at 50.degree.-350.degree. C., if appropriate in the presence of a catalyst which accelerates the condensation and under an inert gas atmosphere, the corresponding phenol being split off.
    Type: Grant
    Filed: December 10, 1985
    Date of Patent: October 20, 1987
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hermann Kauth, Manfred Schmidt, Dieter Freitag, Udo Rudolph, Frank Kleiner
  • Flame-resistant polymer mixtures
    Patent number: 4463130
    Abstract: This invention relates to flame-resistant polymer mixtures of polycarbonate, styrene polymer and/or graft polymer and polyphosphate, which mixtures may contain organic chlorine and bromine compounds and polytetrafluoroethylene used for the production of moulded articles such as electrical housings, electrical insulators, and for moulded automobile parts such as coverings, dashboards and so forth.
    Type: Grant
    Filed: August 31, 1983
    Date of Patent: July 31, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Volker Serini, Horst Peters, Udo Rudolph, Josef Buekers, Werner Nouvertne, Dieter Freitag
  • Process for the production of aromatic carboxylic acid chlorides
    Patent number: 4382898
    Abstract: A single-stage process for the production of pure, particularly sulphur-free, aromatic carboxylic acid chlorides by reacting an aromatic carboxylic acid containing from 1 to 3 carboxyl groups or a corresponding mixture of aromatic carboxylic acids with thionyl chloride in the presence of a catalyst, wherein tertiary phosphine oxides or their reaction products with thionyl chloride and/or the acid chloride to be formed are used as catalysts, and the use of the aromatic dicarboxylic acid dichlorides and tricarboxylic acid trichlorides obtained for the production of polycondensates.
    Type: Grant
    Filed: October 19, 1981
    Date of Patent: May 10, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Udo Rudolph, Dieter Freitag, Ludwig Bottenbruch, Manfred Schmidt
  • Process for the production of aromatic carboxylic acid chlorides
    Patent number: 4382041
    Abstract: A single-stage process for the production of pure aromatic carboxylic acid chlorides by reacting an aromatic carboxylic acid or an aromatic carboxylic acid mixture with thionylchloride in the presence of tert. phosphine as the catalyst.
    Type: Grant
    Filed: October 19, 1981
    Date of Patent: May 3, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Udo Rudolph, Manfred Schmidt, Dieter Freitag, Ludwig Bottenbruch
  • Isomerization of bisphenols
    Patent number: RE34626
    Abstract: This invention relates to a process for the preparation of bisphenols and bisphenol mixtures by the isomerization of bisphenols on acid or alkaline catalysts in the presence of the corresponding phenols.
    Type: Grant
    Filed: February 1, 1993
    Date of Patent: May 31, 1994
    Assignee: Bayer AG
    Inventors: Udo Rudolph, Claus Wulff