Patents by Inventor Helmut Wemheuer

Helmut Wemheuer 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).

  • Method of preparing modified or unmodified poly-(alkylpentamethyleneterephthalamide)
    Patent number: 4163101
    Abstract: A process for preparing a poly-(alkylpentamethyleneterephthalamide) which comprises heating an aqueous solution of the corresponding nylon salt and still water soluble low molecular weight oligomer, the mixture of nylon salt and oligomer having 20 to 50 mole percent carbonamide groups and 50 to 80 mole percent salt groups, from a temperature at least as low as 150.degree. C. at atmospheric pressure up to a polycondensation temperature of at least 250.degree. C.
    Type: Grant
    Filed: June 3, 1977
    Date of Patent: July 31, 1979
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Gerhard Schade, Norbert Vollkommer, Helmut Wemheuer