Patents by Inventor Evald Holstad

Evald Holstad 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).

  • Patent number: 10364639
    Abstract: This invention relates to a sealing apparatus, system and method for use in a well pipe. The apparatus has a mandrel arranged around a center axis through the apparatus, a radially movable gripping device arranged around the mandrel, a radially movable packer element arranged around the mandrel, and an axially movable activation device designed to set up axial forces for activating the apparatus. The apparatus also includes a radially movable centralizer arranged around the mandrel for centring the apparatus. The activation device being operatively connected to the gripping device, the packer element and the centralizer for the respective activation and radial movement of each, via power transmission of axial forces, between retracted, passive positions and expanded, active positions relative to the center axis of the apparatus.
    Type: Grant
    Filed: August 20, 2015
    Date of Patent: July 30, 2019
    Assignee: E Holstad Holding AS
    Inventors: Tommy Svartvatn, Tom Henning Bode, Frode Flugheim Heggestad, Arnulf Bye, Thomas Berge, Evald Holstad, Thomas Bergan Johansen, Oyvind Naess Johannessen
  • Publication number: 20170234102
    Abstract: This invention relates to a sealing apparatus, system and method for use in a well pipe. The apparatus has a mandrel arranged around a centre axis through the apparatus, a radially movable gripping device arranged around the mandrel, a radially movable packer element arranged around the mandrel, and an axially movable activation device designed to set up axial forces for activating the apparatus. The apparatus also includes a radially movable centralizer arranged around the mandrel for centring the apparatus. The activation device being operatively connected to the gripping device, the packer element and the centralizer for the respective activation and radial movement of each, via power transmission of axial forces, between retracted, passive positions and expanded, active positions relative to the centre axis of the apparatus.
    Type: Application
    Filed: August 20, 2015
    Publication date: August 17, 2017
    Inventors: Tommy Svartvatn, Tom Henning Bode, Frode Flugheim Heggestad, Arnulf Bye, Thomas Berge, Evald Holstad, Thomas Bergan Johansen, Oyvind Naess Johannessen
  • Patent number: 8333219
    Abstract: A pipe plug comprising a shaft, a force transmission body disposed in a rotatable and axially movable manner about the shaft via a thread connection, and a stop body. Between the force transmission body and the stop body there is a first compression body disposed in an axially movable manner about the shaft in proximity of the force transmission body; a conical support body disposed in an axially movable manner about the shaft; at least one movable anchoring body on the outside of the support body; a second compression body disposed in an axially movable manner about the shaft; and at least one elastic sealing body disposed about the shaft. The shaft and the first compression body are in direct contact with each other and are connected in a non-rotational manner via complementary connection elements to prevent the compression body from rotating.
    Type: Grant
    Filed: January 20, 2010
    Date of Patent: December 18, 2012
    Inventor: Evald Holstad
  • Publication number: 20110278022
    Abstract: A pipe plug comprising a shaft, a force transmission body disposed in a rotatable and axially movable manner about the shaft via a thread connection, and a stop body. Between the force transmission body and the stop body there is a first compression body disposed in an axially movable manner about the shaft in proximity of the force transmission body; a conical support body disposed in an axially movable manner about the shaft; at least one movable anchoring body on the outside of the support body; a second compression body disposed in an axially movable manner about the shaft; and at least one elastic sealing body disposed about the shaft. The shaft and the first compression body are in direct contact with each other and are connected in a non-rotational manner via complementary connection elements to prevent the compression body from rotating.
    Type: Application
    Filed: January 20, 2010
    Publication date: November 17, 2011
    Inventor: Evald Holstad