Patents by Inventor Edzard Tholema

Edzard Tholema 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).

  • Process for the production of diazonium compounds with a low content of sodium ions
    Patent number: 5986075
    Abstract: The present invention relates to a process for desalting aqueous suspensions containing an organic diazonium compound and electrolytes containing Na ions, in which the aqueous suspension is passed through a semipermeable membrane.
    Type: Grant
    Filed: January 20, 1999
    Date of Patent: November 16, 1999
    Assignees: Bayer Corporation, Bayer Aktiengesellschaft
    Inventors: John C. DuBose, Andrew D. Johnson, Samuel Shaun Murphree, Edzard Tholema, Helmut Hoffmann, Wolfgang Zarges, Wolfgang Frank, Bettina Burkhardt
  • Process for preparing low-salt preparations of condensation products
    Patent number: 5888400
    Abstract: A process for preparing low-salt preparations of condensation products based onA) sulphonated aromatics,B) aldehydes and/or ketones and optionallyC) one or more compounds selected from the group consisting of nonsulphonated aromatics, urea and urea derivatives,characterized in that inorganic acid present after the condensation is separated off in whole or in part from the condensation product, optionally in the form of its salts after neutralization, until the inorganic salt content is less than 10% by weight, relative to the preparation, leads to preparations which are outstandingly suitable as tanning agents, dispersants and liquefiers.
    Type: Grant
    Filed: June 20, 1997
    Date of Patent: March 30, 1999
    Assignee: Bayer Aktiengesellschaft
    Inventors: Edzard Tholema, Wolfgang Zarges, Harro Traubel
  • Process for drying pumpable suspensions
    Patent number: 4430156
    Abstract: In a multiphase flow tube for drying pumpable suspensions to form solids having low residual moisture contents, the process uses brief increases in the pressure of the gas stream to prevent blockages.
    Type: Grant
    Filed: August 6, 1981
    Date of Patent: February 7, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Clemens Casper, Dieter Grenner, Gerd-Rudiger Klette, Edzard Tholema
  • Edge sealing for filter cloths
    Patent number: 4212746
    Abstract: If the edge of a filter cloth is coated with one or more layers of a polychloroprene latex mixture which contains zinc oxide and a silicate filler in addition to a polychloroprene with carboxyl groups, sticking is so greatly reduced that the durability of the filter cloths is substantially increased.
    Type: Grant
    Filed: December 26, 1978
    Date of Patent: July 15, 1980
    Assignee: Bayer Aktiengesellschaft
    Inventors: Edzard Tholema, Heinz-Gerd Nonnenbruch, Hans Gossmann, Peter Schultz