Patents by Inventor Helmut Waldman

Helmut Waldman 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).

  • Pump for delivering hot, corrosive media
    Patent number: 5569024
    Abstract: A pump for delivering hot, corrosive material having a shaft seal comprising a seal gap through which hot gases flow, and wherein the sealing gases also flow around the pump bearings for the purpose of cooling the bearings.
    Type: Grant
    Filed: September 6, 1995
    Date of Patent: October 29, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Ulrich Dummersdorf, Helmut Waldman, Helmut Harle, Franz-Rudolf Minz, Fritz Gestermann
  • Process for the hydroxylation of phenols and phenol ethers in the nucleus
    Patent number: 4174460
    Abstract: A process for the hydroxylation of phenols and phenol ethers in the nucleus with hydrogen peroxide wherein a phenol or a phenol ether is reacted at the start of the reaction with substantially anhydrous hydrogen peroxide and wherein the reaction is carried out in the presence of a strong acid.
    Type: Grant
    Filed: March 31, 1977
    Date of Patent: November 13, 1979
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hermann Seifert, Helmut Waldman, Wulf Schwerdtel, Wolfgang Swodenk