Patents by Inventor Wilhelm K. Risse

Wilhelm K. Risse 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 producing polyarylethers by forming an alkylated intermediate
    Patent number: 4801657
    Abstract: Two step process for preparing high molecular weight, high melting polyarylethers by polycondensing an alkyl-substituted dihydric phenol and an aromatic dihalide, and thereafter dealkylating the polycondensation product.
    Type: Grant
    Filed: April 2, 1987
    Date of Patent: January 31, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Wilhelm K. Risse