Patents by Inventor Peter R. Hartwig

Peter R. Hartwig 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).

  • Apparatus for mixing plastics
    Patent number: 4073408
    Abstract: Apparatus for forming mixture of plastic components having a mixing head to which is attached a storage container for each component and which is equipped with a supply line, a return line, and a displaceable control member, which in one position has two injection openings which are connected to the mixing head by supply lines and in another position has two grooves for connecting the supply lines to the return lines.
    Type: Grant
    Filed: March 4, 1976
    Date of Patent: February 14, 1978
    Assignee: Schloemann-Siemag Aktiengesellschaft
    Inventor: Peter R. Hartwig