Patents by Inventor Leonard Arthur Hall

Leonard Arthur Hall 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).

  • Seal assemblies
    Patent number: 6708981
    Abstract: A seal assembly (22) for sealing a pressurized gaseous product includes, a pair of seals (24,26) spaced axially to provide a chamber (28) therebetween, a gas seal (24) being disposed on the inboard side of the seal assembly (22) between the sealed gaseous product and the chamber (28), an inlet (38) opening to the side of the gas seal (24) exposed to the gaseous product, the inlet (38) being connected to a supply of clean gas, the chamber (38) defined between the seals (24,26) being connected to a reservoir (50), the reservoir (50) being connected back to inlet (38) via a pressure intensifier (70) and the reservoir (50) being connected to the supply of clean gas, so that additional clean gas may be supplied thereto, when pressure in the reservoir (50) falls below a predetermined minimum value.
    Type: Grant
    Filed: February 22, 2001
    Date of Patent: March 23, 2004
    Assignee: John Crane UK Limited
    Inventors: Leonard Arthur Hall, Wayne Darren Read
  • Seal assemblies
    Publication number: 20010017445
    Abstract: A seal assembly (22) for sealing a pressurized gaseous product includes, a pair of seals (24,26) spaced axially to provide a chamber (28) therebetween, a gas seal (24) being disposed on the inboard side of the seal assembly (22) between the sealed gaseous product and the chamber (28), an inlet (38) opening to the side of the gas seal (24) exposed to the gaseous product, the inlet (38) being connected to a supply of clean gas, the chamber (38) defined between the seals (24,26) being connected to a reservoir (50), the reservoir (50) being connected back to inlet (38) via a pressure intensifier (70) and the reservoir (50) being connected to the supply of clean gas, so that additional clean gas may be supplied thereto, when pressure in the reservoir (50) falls below a predetermined minimum value.
    Type: Application
    Filed: February 22, 2001
    Publication date: August 30, 2001
    Inventors: Leonard Arthur Hall, Wayne Darren Read