Patents by Inventor Russell F. Wilmarth

Russell F. Wilmarth 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: 4397462
    Abstract: A pneumatic exercising device uses a lever arm operated by the exerciser which works against a pneumatic cylinder. The pneumatic cylinder is connected to a much larger reservoir, the pressure in which can be adjusted as desired by means of an auxiliary pump. The reservoir is contained in one of the support members for the exercise device. A preferred embodiment is a bench press wherein the height of the lever arm above the bench is adjustable by setting the height of the lever arm fulcrum on a vertical support therefor, which vertical support is hollow and contains the air reservoir, the pneumatic cylinder being connected thereto by a length of flexible hose. The air reservoir is preferably sized so that the pressure remains essentially constant as does the force offered by the lever arm.
    Type: Grant
    Filed: June 26, 1981
    Date of Patent: August 9, 1983
    Inventor: Russell F. Wilmarth
  • Patent number: 4240493
    Abstract: In a shell investment casting process a reusable pouring cup form is used. The shell mold is built up around both the pattern and the pouring cup form. When the pattern wax is removed, the pouring cup form is also removed to leave a formed in situ pouring cup. A significant feature is that the pouring cup has a rolled lip that is relatively strong and does not tend to cast debris into the mold. This lip facilitates handling of the shell mold.
    Type: Grant
    Filed: April 9, 1979
    Date of Patent: December 23, 1980
    Inventor: Russell F. Wilmarth