Patents by Inventor Max H. Prufer

Max H. Prufer 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).

  • Internal expansion waterbed fitting
    Patent number: 4673010
    Abstract: A waterbed filling unit has an outer sleeve which can be inserted into a waterbed filler neck and also coupled to a water supply or drain. An inner sleeve may be pressed into the outer sleeve to create watertight seals between the water supply or drain and the filler neck.
    Type: Grant
    Filed: June 10, 1985
    Date of Patent: June 16, 1987
    Inventors: Max H. Prufer, James M. Prufer