Patents by Inventor Johnny N. Castle

Johnny N. Castle 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).

  • Roller cone core bit with spiral stabilizers
    Patent number: 5289889
    Abstract: This invention relates to an improved roller cone coring bit that includes spiral stabilizer blades on the bit body. The spiral stabilizer blades reduce the whirling tendency of the bit, thereby enhancing the ability to cut and recover a continuous core.
    Type: Grant
    Filed: January 21, 1993
    Date of Patent: March 1, 1994
    Inventors: Marvin Gearhart, Johnny N. Castle, Paul G. Parys