Patents by Inventor Alan D. Griffiths

Alan D. Griffiths 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).

  • Marine growth retarding hose
    Patent number: 4789005
    Abstract: A flexible hose suitable for use in seawater contains a small amount of copper dust in its elastomeric cover. The copper dust, even though present in a small amount, inhibits marine growth on the hose and prevents marine creatures boring very far into the hose. The hose is particularly suitable for the transportation of corrosive fluid such as crude oil.
    Type: Grant
    Filed: March 14, 1988
    Date of Patent: December 6, 1988
    Assignee: Dunlop Limited
    Inventor: Alan D. Griffiths
  • Method of making a hose
    Patent number: 4773151
    Abstract: A flexible hose suitable for the transportation of biphasic fluids such as crude oil containing hydrogen sulphide is reinforced by steel wires of a kind having a coating of aluminium formed by applying the aluminium to the steel under a high pressure so as to bring the two metals into intimate contact.Preferably the wires are subject to a drawing operation subsequent to cladding.
    Type: Grant
    Filed: August 6, 1987
    Date of Patent: September 27, 1988
    Assignee: Dunlop Limited
    Inventors: Alan D. Griffiths, Peter T. Hale
  • Hose
    Patent number: 4727909
    Abstract: A flexible hose suitable for transporting crude oil has a fluid sealing layer of flexible polymeric material disposed between radially inner and radially outer support layers which resist any tendency for the polymeric material to expand.The inner support layer is formed by at least one helically wound element the successive turns of which are interlocked and define in the outer surface of the inner support layer a helically extending crevice, and the surrounding polymeric material is arranged to substantially wholly fill said crevice.
    Type: Grant
    Filed: February 11, 1987
    Date of Patent: March 1, 1988
    Assignee: Dunlop Limited a British Company
    Inventor: Alan D. Griffiths
  • Hose
    Patent number: 4688604
    Abstract: A flexible hose suitable for the transportation of crude oil at elevated temperature and pressure comprises an assembly of a layer of polymeric material disposed between radially inner and radially outer support layers. The polymeric material is of a kind which normally would expand by at least 10% when exposed to the crude oil but which in the assembly is constrained against expansion by said inner and outer support layers.
    Type: Grant
    Filed: December 11, 1984
    Date of Patent: August 25, 1987
    Assignee: Dunlop Limited
    Inventor: Alan D. Griffiths