Patents by Inventor David Du

David Du 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).

  • Pipelaying
    Patent number: 10544880
    Abstract: A mudmat for a subsea pipeline accessory has a body with an accessory support structure arranged to lie underneath and support an accessory. At least one foundation element attached to the body is movable from a stowed position at least partially under the accessory support structure into a deployed position extending laterally from the accessory support structure after overboarding the accessory from a vessel and before landing the accessory on the seabed. Two or more foundation elements may be deployed simultaneously in laterally-opposed directions transverse to the longitudinal axis of a pipe that supports the accessory.
    Type: Grant
    Filed: March 5, 2018
    Date of Patent: January 28, 2020
    Assignee: Subsea 7 Limited
    Inventor: David Du
  • Pipelaying
    Publication number: 20180195642
    Abstract: A mudmat for a subsea pipeline accessory comprises a body (12) having an accessory support structure (16) arranged to lie underneath and support an accessory. At least one foundation element (14) attached to the body is movable from a stowed position at least partially under the accessory support structure into a deployed position extending laterally from the accessory support structure after overboarding the accessory from a vessel and before landing the accessory on the seabed. Two or more foundation elements may be deployed simultaneously in laterally-opposed directions transverse to the longitudinal axis of a pipe that supports the accessory.
    Type: Application
    Filed: March 5, 2018
    Publication date: July 12, 2018
    Inventor: David Du
  • Pipelaying
    Patent number: 9909689
    Abstract: A mudmat for a subsea pipeline accessory has a body with an accessory support structure arranged to lie underneath and support an accessory. At least one foundation element attached to the body is movable from a stowed position at least partially under the accessory support structure into a deployed position extending laterally from the accessory support structure after overboarding the accessory from a vessel and before landing the accessory on the seabed. Two or more foundation elements may be deployed simultaneously in laterally-opposed directions transverse to the longitudinal axis of a pipe that supports the accessory.
    Type: Grant
    Filed: March 3, 2014
    Date of Patent: March 6, 2018
    Assignee: Subsea 7 Limited
    Inventor: David Du
  • Pipelaying
    Publication number: 20160025240
    Abstract: A mudmat for a subsea pipeline accessory has a body with an accessory support structure arranged to lie underneath and support an accessory. At least one foundation element attached to the body is movable from a stowed position at least partially under the accessory support structure into a deployed position extending laterally from the accessory support structure after overboarding the accessory from a vessel and before landing the accessory on the seabed. Two or more foundation elements may be deployed simultaneously in laterally-opposed directions transverse to the longitudinal axis of a pipe that supports the accessory.
    Type: Application
    Filed: March 3, 2014
    Publication date: January 28, 2016
    Inventor: David Du