Patents by Inventor John J. Brennan

John J. Brennan 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: 4378481
    Abstract: Backers for electron beam hole drilling contain glass particulates with a binder. For nickel base alloys, the glass particulates have at least 7 weight percent low temperature constituent, with a melting point less than 1500.degree. C., and a balance of high temperature constituent having a vaporization point of greater than 2000.degree. C. at 1 atmosphere. Softening points of the glasses exceed 700.degree. C. and preferably are in the range 800.degree.-1000.degree. C. A useful glass will have a viscosity of at least about 10 Pa.multidot.s when it melts. More preferred silicate glasses contain by weight percent at least 8Al.sub.2 O.sub.3, 9CaO, and 3B.sub.2 O.sub.3.
    Type: Grant
    Filed: March 2, 1981
    Date of Patent: March 29, 1983
    Assignee: United Technologies Corporation
    Inventors: John J. Brennan, Lester W. Jordan
  • Patent number: 4341826
    Abstract: A high strength, fracture tough, high temperature oxidatively stable, heat insulating internal combustion engine combustion chamber component is described made of a silicon carbide fiber reinforced ceramic matrix or a silicon carbide fiber reinforced glass matrix material. An internal combustion engine containing combustion chamber components as above described is also disclosed.
    Type: Grant
    Filed: May 14, 1980
    Date of Patent: July 27, 1982
    Assignee: United Technologies Corporation
    Inventors: Karl M. Prewo, John J. Brennan
  • Patent number: 4324843
    Abstract: A silicon carbide fiber reinforced ceramic matrix composite is disclosed having high strength, fracture toughness, and oxidative stability even at high temperature use. The composite is made up of a plurality of ceramic layers, each layer reinforced with a plurality of unidirectional continuous length silicon carbide fibers, each layer having an axial flexural strength greater than 70,000 psi and a high fracture toughness, exemplified by a critical stress intensity factor greater than 10.times.10.sup.3 psi (inch).sup.1/2. The composite is formed by starting with the ceramic matrix material in the glassy state and converting it from the glassy state to the ceramic state after densification of the composite.
    Type: Grant
    Filed: February 13, 1980
    Date of Patent: April 13, 1982
    Assignee: United Technologies Corporation
    Inventors: John J. Brennan, Karl M. Prewo
  • Patent number: 4314852
    Abstract: Silicon carbide fiber reinforced glass composites are disclosed having high strength, fracture toughness, and oxidative stability, even in high temperature use environments. Disclosed composites include silicon carbide fiber reinforced borosilicate glass, high silica content glass, and aluminosilicate glass. Flexural strengths in excess of 40,000 psi up to temperatures as high as 1150.degree. C. are attained with such composites.
    Type: Grant
    Filed: May 7, 1980
    Date of Patent: February 9, 1982
    Assignee: United Technologies Corporation
    Inventors: John J. Brennan, Karl M. Prewo
  • Patent number: 4252860
    Abstract: A method is described for increasing the impact properties of dense silicon nitride articles. The method includes the application of a slurry composed predominately of silicon powder to the surface of the dense silicon nitride article. The slurry coated article is then nitrided at an elevated temperature to partially convert the silicon powder to silicon nitride and to bond the particles together and to the substrate. About 15 to 45 volume percent of the silicon powder is not converted to silicon nitride but remains as elemental silicon.
    Type: Grant
    Filed: July 2, 1979
    Date of Patent: February 24, 1981
    Assignee: United Technologies Corporation
    Inventors: John J. Brennan, Francis S. Galasso, Charles O. Hulse
  • Patent number: 3957575
    Abstract: In a light water reactor system using the thorium-232 -- uranium-233 fuel system in a seed-blanket modular core configuration having the modules arranged in a symmetrical array surrounded by a reflector blanket region, the seed regions are disposed for a longitudinal movement between the fixed or stationary blanket region which surrounds each seed region. Control of the reactor is obtained by moving the inner seed region thus changing the geometry of the reactor, and thereby changing the leakage of neutrons from the relatively small seed region into the blanket region.
    Type: Grant
    Filed: April 16, 1974
    Date of Patent: May 18, 1976
    Assignee: The United States of America as represented by the United States Energy Research and Development Administration
    Inventors: William L. Fauth, Jr., Daniel S. Jones, George J. Kolsun, John G. Erbes, John J. Brennan, James A. Weissburg, John E. Sharbaugh
  • Patent number: 3953647
    Abstract: A novel filament reinforced composite comprising a plurality of fibers selected from the group consisting of graphite fibers, amorphous carbon fibers and pyrolytic graphite fibers bonded together in an aluminide matrix, selected from the group consisting of nickel aluminide, cobalt aluminide and solutions and mixtures thereof, said composite having relatively high strengths at elevated temperatures.
    Type: Grant
    Filed: October 5, 1973
    Date of Patent: April 27, 1976
    Assignee: United Technologies Corporation
    Inventors: John J. Brennan, Norman S. Bornstein