Patents by Inventor Norvel L. Miller

Norvel L. Miller 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).

  • Variable frequency vacuum actuated seismic energy source
    Patent number: 4421198
    Abstract: A variable frequency seismic pulse is produced by releasing a weighted piston within a partially evacuated cylinder. The piston compresses residual air in the cylinder before striking a base plate held firmly in contact with the ground. Controlling the pressure of the gas remaining in the cylinder controls the frequency and amplitude of the seismic pulse applied to the ground. The seismic pulse can be applied at various angles from vertical from a thumper mounted on a vehicle or from a hand-held thumper.
    Type: Grant
    Filed: November 27, 1981
    Date of Patent: December 20, 1983
    Inventor: Norvel L. Miller