Patents by Inventor Ing. Walter Schwarz

Ing. Walter Schwarz 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).

  • Pipe joint
    Patent number: 3989280
    Abstract: A pipe joint between a pipe of reinforced plastic and a second pipe, which may be metal or plastic, and which may have a peripheral shoulder with the plastic material of the first pipe overlapping and interlocking with the shoulder.
    Type: Grant
    Filed: September 10, 1973
    Date of Patent: November 2, 1976
    Inventor: Ing. Walter Schwarz