Patents by Inventor Paul A. Doleman

Paul A. Doleman 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).

  • Patent number: 6660115
    Abstract: A method of manufacturing a ceramic matrix composite comprises forming a slurry comprising a ceramic sol, filler particles and a solvent and forming laminates of fibers (12). The laminates of fibers (12) are impregnated with the slurry and are stacked (14) on a mold (10). The stack (14) of laminates of fibers (12) is covered by a porous membrane (16), a breather fabric (18) and a vacuum bag (20). The vacuum bag (20) is evacuated and is heated to a temperature of 60° C. for 10 hours to produce a ceramic matrix composite. The ceramic matrix composite is then heated to a temperature of 1200° C. at atmospheric pressure to sinter the ceramic matrix composite.
    Type: Grant
    Filed: September 18, 2002
    Date of Patent: December 9, 2003
    Assignee: Rolls-Royce plc
    Inventors: Edwin G Butler, Anthony G Razzell, John Dominy, Paul A Doleman, Ihsan A H Al-Dawery
  • Publication number: 20030034113
    Abstract: A method of manufacturing a ceramic matrix composite comprises forming a slurry comprising a ceramic sol, filler particles and a solvent and forming laminates of fibers (12). The laminates of fibers (12) are impregnated with the slurry and are stacked (14) on a mold (10). The stack (14) of laminates of fibers (12) is covered by a porous membrane (16), a breather fabric (18) and a vacuum bag (20). The vacuum bag (20) is evacuated and is heated to a temperature of 60° C. for 10 hours to produce a ceramic matrix composite. The ceramic matrix composite is then heated to a temperature of 1200° C. at atmospheric pressure to sinter the ceramic matrix composite.
    Type: Application
    Filed: September 18, 2002
    Publication date: February 20, 2003
    Inventors: Edwin G. Butler, Anthony G. Razzell, John Dominy, Paul A. Doleman, Ihsan A.H. Al-Dawery
  • Patent number: 6497776
    Abstract: A method of manufacturing a ceramic matrix composite comprises forming a slurry comprising a ceramic sol, filler particles and a solvent and forming laminates of fibres (12). The laminates of fibres (12) are impregnated with the slurry and are stacked (14) on a mould (10). The stack (14) of laminates of fibres (12) is covered by a porous membrane (16), a breather fabric (18) and a vacuum bag (20). The vacuum bag (20) is evacuated and is heated to a temperature of 60° C. for 10 hours to produce a ceramic matrix composite. The ceramic matrix composite is then heated to a temperature of 1200° C. at atmospheric pressure to sinter the ceramic matrix composite.
    Type: Grant
    Filed: December 15, 1999
    Date of Patent: December 24, 2002
    Assignee: Rolls-Royce plc
    Inventors: Edwin G. Butler, Anthony G. Razzell, John Dominy, Paul A. Doleman, Ihsan AI-I Al-Dawery
  • Patent number: 5962076
    Abstract: An abradable seal comprises a plurality of hollow aluminosilicate spheres in a matrix of aluminium phosphate. The matrix of aluminium phosphate also has an aluminosilicate filler. The hollow aluminosilicate spheres have a diameter in the range of 400 to 1800 microns, preferably a diameter in the range of 800 to 1400 microns. The weight proportion of hollow aluminosilicate spheres in the abradable seal is 30% to 50%. The density of the abradable seal is 1.5 grams per cubic centimeter. The hollow aluminosilicate spheres in the aluminium phosphate matrix have a relatively high temperature capability of approximately 1300.degree. C. maximum. This makes the abradable seal better able to withstand the environment in the turbine of a turbofan gas turbine engine.
    Type: Grant
    Filed: April 22, 1998
    Date of Patent: October 5, 1999
    Assignee: Rolls-Royce plc
    Inventors: Stephen Mason, Michael J L Percival, Gary B. Merrill, Paul A. Doleman
  • Patent number: 5780146
    Abstract: An abradable seal comprises a plurality of hollow aluminosilicate spheres in a matrix of aluminium phosphate. The matrix of aluminium phosphate also has an aluminosilicate filler. The hollow aluminosilicate spheres have a diameter in the range of 400 to 1800 microns, preferably a diameter in the range of 800 to 1400 microns. The weight proportion of hollow aluminosilicate spheres in the abradable seal is 30% to 50%. The density of the abradable seal is 1.5 grammes per cubic centimetre. The hollow aluminosilicate spheres in the aluminium phosphate matrix have a relatively high temperature capability of approximately 1300.degree. C. maximum. This makes the abradable seal better able to withstand the environment in the turbine of a turbofan gas turbine engine.
    Type: Grant
    Filed: May 22, 1996
    Date of Patent: July 14, 1998
    Assignee: Rolls-Royce plc
    Inventors: Stephen Mason, Michael J. L. Percival, Gary B. Merrill, Paul A. Doleman
  • Patent number: 5609741
    Abstract: A method of manufacturing a composite material in which a fibre matt is placed adjacent a plate electrode in ceramic sol. The application of an electric field to the sol via the electrode results in the deposition of sol particles on the electrode which subsequently permeate the fibre matt. The permeated fibre matt is then removed from the sol, dried out and heated to sinter the sol particles.
    Type: Grant
    Filed: October 20, 1994
    Date of Patent: March 11, 1997
    Assignee: Rolls-Royce plc
    Inventors: Trevor J. Illston, Paul A. Doleman, Edwin G. Butler, Peter M. Marquis, Clive B. Ponton, Reza Piramoon, Mark J. Gilbert
  • Patent number: 5554271
    Abstract: A method of manufacturing a composite material which comprises ceramic fibers in a matrix of a ceramic material. A woven mat of ceramic fibers having an electrically conductive coating thereon is immersed in a sol. The sol comprises surface-charged ceramic particles. A potential difference is applied between the fibers and a second electrode placed in the sol. The applied potential difference is continued until the mat is permeated by the ceramic particles in the sol. The mat is removed from the sol and is then heated to sinter the permeated ceramic particles.
    Type: Grant
    Filed: March 8, 1995
    Date of Patent: September 10, 1996
    Assignee: Rolls-Royce plc
    Inventors: Trevor J. Illston, Paul A. Doleman, Edwin G. Butler, Peter M. Marquis, Clive B. Ponton, Reza Piramoon, Mark J. Gilbert
  • Patent number: 5373750
    Abstract: The mechanical behavior of a given component formed from reinforcing ceramic fibers enclosed in a ceramic matrix is determined by subjecting a dummy component to mechanical testing. The dummy component is formed from low modulus organic resin fibers enclosed in a matrix of an organic resin having a correspondingly low modulus. The organic resin fibers have the same configuration and fiber architecture as those of the ceramic fibers.
    Type: Grant
    Filed: September 1, 1992
    Date of Patent: December 20, 1994
    Assignee: Rolls-Royce plc
    Inventors: Edwin Butler, Paul A. Doleman