Patents by Inventor Donald J. Kristmanson

Donald J. Kristmanson 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).

  • Hinge assembly for connecting a float to a base
    Patent number: 4930184
    Abstract: A hinge assembly means for connecting a float to a base includes a male member means connected to one of the base and the float having a cylindrical outwardly extending boss and a female member means connected to the other of the base and the float having a cylindrical, inwardly-extending recess. A resilient, rubber-like bearing sleeve means encircles and engages the outer circumference of the boss and is of a thickness to fit between the boss and the recess to rotatably attach the recess about the outer circumference of the sleeve.
    Type: Grant
    Filed: December 16, 1988
    Date of Patent: June 5, 1990
    Inventor: Donald J. Kristmanson