Patents by Inventor Walter S. Pawl

Walter S. Pawl 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).

  • Peripherally grooved building blocks in a wall construction
    Patent number: 4003172
    Abstract: The interlocked building blocks, which normally require no mortar, have undercut grooves around their face edges, forming dove-tail-sectioned grooves at all the joints between adjacent blocks in a wall, which may be used to receive and hold sealing material for the joints, as well as to provide suitable support means for fixing attachment hooks or clips to the wall.
    Type: Grant
    Filed: September 30, 1975
    Date of Patent: January 18, 1977
    Inventor: Walter S. Pawl