Patents by Inventor Frederic Hoffmanns

Frederic Hoffmanns 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).

  • Security railing
    Patent number: 4930754
    Abstract: A security railing is formed from thick wall polyvinyl chloride pipe (PVC) having PVC tee, cross and elbow fittings providing flush joints. A PVC joint aligner and strengthener is inserted in and extends across each joint, The joints and aligners are chemically welded to form a unitary structure. Joint aligners may include a steel core.
    Type: Grant
    Filed: December 27, 1988
    Date of Patent: June 5, 1990
    Inventors: John L. Caron, Frederic Hoffmanns