Patents by Inventor Johannus J. DeGroot

Johannus J. DeGroot 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).

  • Portable, retractable sports enclosure
    Patent number: 5634638
    Abstract: A portable self-standing sports enclosure which may be opened and closed by a single person. A carrier frame contains at least one foldable frame section. Each foldable frame section includes an enclosure support member. The foldable frame sections fold into and are locked to a carrier frame for transportation. The foldable frame sections may be hinged to allow the frame to fold to half their normal height. An optional carrier frame with wheels allows easy transportation. Netting proximate the frame members completely encloses the sports activities inside.
    Type: Grant
    Filed: July 6, 1995
    Date of Patent: June 3, 1997
    Assignee: RJB Sports Equipment, Inc.
    Inventors: Ronald W. Havens, Johannus J. DeGroot, William J. McMillan