Patents by Inventor Dennis I. Marshala

Dennis I. Marshala 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).

  • Publication number: 20150322740
    Abstract: A drill string tubing anchor defines a quarter turn means for driving at least one upper cone below a slip by quarter turn rotation of a J-pin within a shaped J-slot, extending the slip from within the anchor housing against the tubing surface. The anchor also includes a shear pin within a lower cone as a secondary means to engage the slip upon shearing of the pin engaging in an emergency situation and recover of the tubing, which would require an upward movement to disengage the lower cone and this relieve the pressure on the slip to elevate the anchor from within the tubing.
    Type: Application
    Filed: March 12, 2015
    Publication date: November 12, 2015
    Inventors: Dennis I. Marshala, Timothy Ray Young