Patents by Inventor Heinz Hefner, deceased

Heinz Hefner, deceased 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).

  • Storage-stable polysiloxane composition which gives permanently water-wettable vulcanizates
    Patent number: 5580921
    Abstract: The present invention relates to storage-stable polysiloxane compositions which give permanently water-wettable elastomers. The polysiloxane compositions of the present invention which vulcanize to yield elastomers are useful as dental impression compositions.
    Type: Grant
    Filed: February 10, 1994
    Date of Patent: December 3, 1996
    Assignee: Wacker-Chemie GmbH
    Inventors: Michael Stepp, Heinz Hefner, deceased, Peter Huber, Johann Mueller, Richard Schmidlkofer, Arnold Garhammer