Patents by Inventor George Lee Crawford

George Lee Crawford 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).

  • Abradable seal having improved properties
    Patent number: 6352264
    Abstract: An air seal for use in a gas turbine engine is disclosed. The seal includes a seal substrate, and an abradable layer on the substrate, with the abradable including a thermoset polymer and a thermoplastic polymer. The abradable may also include a filler to add porosity, or provide lubrication, to enhance abradability.
    Type: Grant
    Filed: December 17, 1999
    Date of Patent: March 5, 2002
    Assignee: United Technologies Corporation
    Inventors: William John Dalzell, Jr., Stuart Alan Sanders, George Lee Crawford, Frederick Clell Walden, William J. Woodard
  • METHOD OF MAKING ABRADABLE SEAL HAVING IMPROVED PROPERTIES
    Publication number: 20010055652
    Abstract: An air seal for use in a gas turbine engine provides improved durability, particularly at higher temperatures. The seal includes a seal substrate, and an abradable layer is provided on the substrate by a thermal spray process, with the abradable including a thermoset polymer and a thermoplastic polymer. The abradable may also include a filler to add porosity, or provide lubrication, to enhance abradability.
    Type: Application
    Filed: December 17, 1999
    Publication date: December 27, 2001
    Inventors: WILLIAM JOHN DALZELL, STUART ALAN SANDERS, GEORGE LEE CRAWFORD, FREDERICK CLELL WALDEN
  • Abradable seal having improved properties and method of producing seal
    Patent number: 6089825
    Abstract: An air seal for use in a gas turbine engine includes reduced susceptibility to deflagration during operating conditions in which an excessive amount of seal material is liberated from the seal and ingested into the engine. The seal includes a seal substrate, and a thermally sprayed metallic bond layer applied to the seal substrate. The bond layer includes nickel and aluminum. The seal also includes a thermally sprayed abradable seal layer applied to the bond layer. The abradable material is composed of aluminum powder and silicon powder forming a metal matrix, and co-deposited methyl methacrylate particles embedded as filler in the metal matrix. The filler is less likely to deflagrate compared to conventionally used materials such as polyester.
    Type: Grant
    Filed: December 18, 1998
    Date of Patent: July 18, 2000
    Assignee: United Technologies Corporation
    Inventors: Frederick Clell Walden, George Lee Crawford, William John Dalzell, Jr.