Patents by Inventor Ian F. Stewart

Ian F. Stewart 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).

  • Unified subdivision for arbitrary and partial degree surfaces and curves with consistent property propagation
    Patent number: 7617079
    Abstract: To create an arbitrary-degree limit surface from a mesh, the mesh is first linearly subdivided. Additional linear subdivision and smoothing operations are performed on the initially linearly subdivided mesh. The number of sets of linear subdivision and smoothing operations depends on the desired surface-degree and subdivision level. This procedure can be used to create arbitrary-degree limit surfaces without performing a dual operation. During subdivision the topology of the intermediate mesh is independent of the goal limit surface-degree.
    Type: Grant
    Filed: January 20, 2003
    Date of Patent: November 10, 2009
    Assignee: Autodesk, Inc.
    Inventors: Ian F. Stewart, André R. Foisy
  • Unified subdivision for arbitrary and partial degree surfaces and curves with consistent property propagation
    Publication number: 20040143426
    Abstract: To create an arbitrary-degree limit surface from a mesh, the mesh is first linearly subdivided. Additional linear subdivision and smoothing operations are performed on the initially linearly subdivided mesh. The number of sets of linear subdivision and smoothing operations depends on the desired surface-degree and subdivision level. This procedure can be used to create arbitrary-degree limit surfaces without performing a dual operation. During subdivision the topology of the intermediate mesh is independent of the goal limit surface-degree.
    Type: Application
    Filed: January 20, 2003
    Publication date: July 22, 2004
    Inventors: Ian F. Stewart, Andre R. Foisy
  • Gas turbine engine casing construction
    Patent number: 5408826
    Abstract: A casing assembly for a ducted fan gas turbine engine comprises a casing around which extend two annular, axially spaced apart, frangible rails. Pieces of cloth woven from an aromatic polyamide fibre are positioned on the casing radially outer surface between the rails. Continuous layers of the cloth are wound around the casing radially outwardly of the rails and cloth pieces. The arrangement provided enhanced containment of any fan blades of the engine which may become detached from the gas turbine engine which carries the casing assembly.
    Type: Grant
    Filed: March 24, 1994
    Date of Patent: April 25, 1995
    Assignee: Rolls-Royce plc
    Inventors: Ian F. Stewart, Sivasubramaniam K. Sathianathan, David J. Chisholm
  • Fan duct casing
    Patent number: 4699567
    Abstract: A containment ring for a gas turbine engine fan duct comprises a rigid cylinder the periphery of which is covered with layers of fibrous material consisting of a plurality of pieces of woven material, around which is wound a further plurality of continuous layers of woven fibrous material which is then covered with a further impervious layer.
    Type: Grant
    Filed: December 31, 1986
    Date of Patent: October 13, 1987
    Assignee: Rolls-Royce plc
    Inventor: Ian F. Stewart