Patents by Inventor Martin Damgaard Christensen

Martin Damgaard Christensen 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).

  • Unbonded, flexible pipe
    Patent number: 9012001
    Abstract: The invention relates to an unbonded, flexible pipe having a length and comprising from inside out, a tubular inner sealing sheath, at least one metal armor layer and an outer sealing sheath of a sealing material. The unbonded, flexible pipe comprises at least one stiffened length section comprising a stiffening cover partially or totally surrounding the outer sealing sheath in the stiffened length section. The stiffening cover comprises a layer of a stiffening material having a flexural modulus which is higher than the flexural modulus of the sealing material, wherein the flexural modulus is determined according to ISO 178.
    Type: Grant
    Filed: December 13, 2010
    Date of Patent: April 21, 2015
    Assignee: National Oilwell Varco Denmark I/S
    Inventors: Claus Dencker Christensen, Inger-Margrete Procida, Martin Damgaard Christensen
  • UNBONDED, FLEXIBLE PIPE
    Publication number: 20120261017
    Abstract: The invention relates to an unbonded, flexible pipe having a length and comprising from inside out, a tubular inner sealing sheath, at least one metal armor layer and an outer sealing sheath of a sealing material. The unbonded, flexible pipe comprises at least one stiffened length section comprising a stiffening cover partially or totally surrounding the outer sealing sheath in the stiffened length section. The stiffening cover comprises a layer of a stiffening material having a flexural modulus which is higher than the flexural modulus of the sealing material, wherein the flexural modulus is determined according to ISO 178.
    Type: Application
    Filed: December 13, 2010
    Publication date: October 18, 2012
    Applicant: NATIONAL OILWELL VARCO DENMARK I/S
    Inventors: Claus Dencker Christensen, Inger-Margrete Procida, Martin Damgaard Christensen