Patents by Inventor Ronald T. Edwards

Ronald T. Edwards 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).

  • Dynamic seals for gas and oil well swabs
    Patent number: 4528896
    Abstract: Gas and oil well swabs, particularly a dynamic seal for maintaining gas-tight contact between the moving swab and the well casing. The seal includes a reinforcing tube and a flexible annulus having an upper throat portion complementally engaging the exterior of the reinforcing tube and a lower bell-shaped skirt portion, engageable with the well casing. The lower bell-shaped skirt portion of the seal defines an expansion chamber for the well gas, which lifts the swab.
    Type: Grant
    Filed: November 29, 1983
    Date of Patent: July 16, 1985
    Inventor: Ronald T. Edwards