Patents by Inventor Doyle W. Roark

Doyle W. Roark 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).

  • Telescoping prop particularly adapted for support or spreading of tree branches
    Patent number: 4377053
    Abstract: Two elongated tubes (11) (13) have respective diameters such that one tube (13) can nest inside the other tube (11). The two tubes (11) (13) are long enough that when the inner tube (13) is extended from its nested position, the overall length of the two tubes (11) (13) is in a range suitable for supporting or spreading tree branches. The interior surface (26) of the outer tube (11) has thereon a first plurality of raised portions which mate with a second plurality of raised portions on the exterior surface (28) of the inner tube (13) such that when the two tubes (11) (13) are in one rotational relationship, relative longitudinal movement of the two tubes (11) (13) is permitted, while when the two tubes (11) (13) are in another rotational relationship, relative longitudinal movement of the two tubes (11) (13) which would tend to shorten the prop is prevented.
    Type: Grant
    Filed: April 3, 1981
    Date of Patent: March 22, 1983
    Inventors: Doyle W. Roark, Carolyn K. Roark