Patents by Inventor Marion N. Craig

Marion N. Craig 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).

  • Exercise bicycle flywheel
    Patent number: 5191809
    Abstract: An exercise bicycle wheel comprises a pair of facing fly wheel halves. The flywheel halves include spokes which extend outwardly from a hub portion and terminate in concave rim portions which face one another. When the two halves are joined, the rim portions define a water tight cavity. This cavity is filled with a heavy material which is initially flowable and which sets in the cavity. Preferably the mixture includes hematite chips, magnetite powder, hydrated lime, portland cement, a water reducer, and water.
    Type: Grant
    Filed: September 16, 1991
    Date of Patent: March 9, 1993
    Assignee: Roadmaster Corporation
    Inventor: Marion N. Craig
  • Stationary exercise device
    Patent number: 4762317
    Abstract: A stationary exercise device has an elongated base frame, a seat supported by the base frame adjacent one end and a non-circular upright support adjacent the other end of the frame, and an exercise cycle assembly removably mounted on the support. The device preferably doubles as a rowing machine, the handle bars of the rowing machine serving a dual purpose.
    Type: Grant
    Filed: May 4, 1987
    Date of Patent: August 9, 1988
    Assignee: Roadmaster Corporation
    Inventors: David K. Camfield, Daniel F. Brashear, Marion N. Craig