Patents by Inventor Donald J. Boersma

Donald J. Boersma 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).

  • Patent number: 4655913
    Abstract: A drain cover having separable mounting means which is adjustable for operational installation in drain pipes of varying standard sizes. The mounting means comprise resilient fingers having short feet which are releasably engageable in radially spaced stirrups die punched from the drain cover disc. In another preferred embodiment, the drainage openings comprise elongated slots having roll formed tubular sockets depending therefrom and the resilient fingers have pairs of wire feet which are frictionally engageable in said sockets.
    Type: Grant
    Filed: April 22, 1985
    Date of Patent: April 7, 1987
    Inventor: Donald J. Boersma
  • Patent number: 4257892
    Abstract: An improved drain cover comprising a one-piece top disc and depending cylindrical body adapted to be readily inserted into a drain pipe with the disc resting on the floor and overlying the pipe opening. The body is formed with four radial slots in which trapezoidal locking slugs are slidably positioned. The body is also formed with a central bore, the lower portion of which is adapted to receive a frusto-conical camming plug. A threaded bolt is slidably positioned through the disc and is threadedly engageable with the plug. When the bolt is tightened, it raises the plug into the bore where it cams the slugs outwardly into locking engagement with the drain pipe.
    Type: Grant
    Filed: December 19, 1979
    Date of Patent: March 24, 1981
    Inventor: Donald J. Boersma
  • Patent number: D256948
    Type: Grant
    Filed: September 13, 1978
    Date of Patent: September 16, 1980
    Assignee: Iodon Incorporated
    Inventor: Donald J. Boersma