Patents Represented by Attorney J. O'Brien

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  • Coprecipitation process for thermionic cathode type materials
    Patent number: 4411827
    Abstract: A method for fabricating a homogenous and uniformly sized mixture of alkaline earth metal carbonates found to be especially useful as an emission type coating material for application to a cathodic element of a thermionic vacuum tube.
    Type: Grant
    Filed: June 23, 1982
    Date of Patent: October 25, 1983
    Inventor: David M. Corneille
  • Method for treating contaminated wastewater
    Patent number: 4402836
    Abstract: A method for treating hydrazine-fuel contaminated wastewater in which hydrazine, monomethyl hydrazine, unsymmetrical dimethyl hydrazine and dimethylnitrosamine pollutants are effectively decomposed at a controlled pH of about 5 by an ultraviolet induced chlorination treatment of the wastewater.
    Type: Grant
    Filed: December 1, 1982
    Date of Patent: September 6, 1983
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Edward G. Fochtman, Roger L. Koch, Forrest S. Forbes
  • Method and solution for etching indium antimonide
    Patent number: 4396459
    Abstract: A method for delineating defects in the <111> surface of an indium antimonide crystal wafer by treating said surface with a 5 percent solution of iodine in N,N-dimethylacetamide to form triangularly shaped etch pits in the defect area.
    Type: Grant
    Filed: September 16, 1982
    Date of Patent: August 2, 1983
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Paul E. Herning, Edward Y. Sutcliffe
  • Diethynylbenzene-ethynylpyrene copolymers
    Patent number: 4393101
    Abstract: A high char yielding matrix resin for use in fabricating carbon-carbon composites comprised of a polymerizable mixture of a diethynylbenzene monomer and an ethynylpyrene monomer.
    Type: Grant
    Filed: June 11, 1982
    Date of Patent: July 12, 1983
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Norman Bilow
  • Implanted boundary layer trip
    Patent number: 4392624
    Abstract: A technique for monitoring the ablation symmetry of a reentry vehicle by implanting a boundary layer trip material into the nose-tip surfaces of the re-entry vehicle's nose cone. The implantation material is characterized by a density that is usually greater and surface roughness that is greater than that which characterizes the material forming the main portion of the nose cone.
    Type: Grant
    Filed: February 6, 1981
    Date of Patent: July 12, 1983
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Robert J. Myer
  • Copolymers from octafluoronaphthalene
    Patent number: 4393198
    Abstract: A method for polymerizing octafluoronaphthalene and the resulting perfluorocompounds prepared therefrom. Polymerization is accomplished by reacting the octafluoronaphthalene monomer with a mono or difluoroxyperfluoroalkane.
    Type: Grant
    Filed: September 30, 1981
    Date of Patent: July 12, 1983
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Madeline S. Toy, Roger S. Stringham
  • Copper containing ballistic additives
    Patent number: 4391660
    Abstract: This invention concerns itself with the addition of certain copper salts and chelates to solid propellant formulations as burning rate modifiers. The additives increase the burning rate of the propellant while simultaneously decreasing its pressure exponent.
    Type: Grant
    Filed: September 10, 1981
    Date of Patent: July 5, 1983
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Robert C. Corley, Frederick F. Myers, Jr.
  • Solvent mixture for removing cured polyurethane coatings
    Patent number: 4383867
    Abstract: A solvent solution for dissolving and removing cured polyurethane formulations composed of a mixture of dichloromethane, dimethyl formamide and methanol as essential components.
    Type: Grant
    Filed: June 30, 1981
    Date of Patent: May 17, 1983
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: John L. Elwell, Jr.
  • Cure retarding additives for acetylene-terminated polymers
    Patent number: 4381363
    Abstract: A polymeric composition comprised of a mixture of an acetylene-terminated polymer and an hydroxy-substituted, polynuclear, aromatic derivative as a cure retarding additive.
    Type: Grant
    Filed: September 10, 1981
    Date of Patent: April 26, 1983
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Theodore J. Reinhart, Jr.
  • Interfacial process for preparing polyaromatic esters
    Patent number: 4381391
    Abstract: New, easily processable, polyaromatic esters were prepared from 2,2'-diiododiphenyl-4,4'-dicarbonyl dichloride, isophthaloyl chloride and/or terephthaloyl chloride in combination with 4,4'-isopropylidene diphenol, 4,4'-sulfonyldiphenol, or resorcinol by interfacial condensation. In these polymers, phenylacetylenyl groups can be easily introduced into the polymer chain by replacing the iodine. This process leads to soluble and curable polymers from which films can be prepared. After curing the polymers are insoluble and show excellent thermal and chemical resistance. The curing process increases the polymers' softening temperature about 20.degree. C.
    Type: Grant
    Filed: March 3, 1981
    Date of Patent: April 26, 1983
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Paul Y. Chen, Carl S. Marvel
  • Process for producing aromatic heterocyclic polymer alloys
    Patent number: 4377546
    Abstract: A novel method is taught for preparing polymeric alloys composed of a mixture of an aromatic heterocyclic rod-like reinforcing polymer and an aromatic heterocyclic coil-like amorphous mixture with vastly improved mechanical properties.
    Type: Grant
    Filed: August 11, 1981
    Date of Patent: March 22, 1983
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Thaddeus E. Helminiak, Charles L. Benner, Fred E. Arnold, George Husman
  • Preparation of stable sodium carbonate dispersions
    Patent number: 4376716
    Abstract: A method for preparing a stable sodium carbonate micro dispersion in hexane by subjecting a starting material composed of a colloidal sodium carbonate dispersion in oil to the steps of flocculation, redispersion, centrifugation and vacuum distillation.
    Type: Grant
    Filed: July 18, 1974
    Date of Patent: March 15, 1983
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Robert Kaiser
  • Method for the preparation of poly (carbonoyl fluoride) oligomers
    Patent number: 4374715
    Abstract: An improved method for synthesizing poly (carbonyl fluoride) oligomers by using bis(trifluoromethyl)trioxide as a reaction initiator in the photo-oxidation of F-3 methylbutene-1.
    Type: Grant
    Filed: June 17, 1981
    Date of Patent: February 22, 1983
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Keith B. Baucom, Burrell N. Hamon
  • Diethynylbenzene-ethynylpyrene copolymers
    Patent number: 4369297
    Abstract: A high char yielding matrix resin for use in fabricating carbon-carbon composites comprised of a polymerizable mixture of a diethynylbenzene monomer and an ethynylpyrene monomer.
    Type: Grant
    Filed: September 30, 1981
    Date of Patent: January 18, 1983
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Norman Bilow
  • Polyaromatic amides having acetylene groupings curable by Diels-Alder cycloaddition
    Patent number: 4367329
    Abstract: New processable polyaromatic amides were prepared from the acid chloride of bis-m-carboxyphenyl acetylene and several aromatic diamines. The polyamides containing the acetylene units were cured by Diels-Alder cycloaddition reaction with 1,4-diphenyl-1,3-butadiene. Cured polyamides showed increase in Tg. thermal and heat stabilities. The polyamides can be cast into films and give good glass fiber laminates.
    Type: Grant
    Filed: May 20, 1981
    Date of Patent: January 4, 1983
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Venkatesa Sankaran, Carl S. Marvel
  • Acetylene-terminated polyimide compositions
    Patent number: 4365034
    Abstract: A composition of matter comprising an acetylene-terminated polyimide oligomer and a cure rate inhibitor selected from the group consisting of hydroquinone, maleic acid, glutaric acid, dibetanapthyl para-phenylene diamine. The composition has a retarded cure rate, thereby facilitating the fabrication of void-free molded objects and composites.
    Type: Grant
    Filed: September 21, 1981
    Date of Patent: December 21, 1982
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Mark F. Grimes, Theodore J. Reinhart, Jr.
  • Solvent mixture for removing polysulfide and silicone rubber coatings
    Patent number: 4362570
    Abstract: A solvent for dissolving and removing polysulfide and polysilicone rubber coatings from a metal substrate. The solvent is composed of a mixture of dichloromethane and a minor amount of a chlorotrimethylsilane.
    Type: Grant
    Filed: October 13, 1981
    Date of Patent: December 7, 1982
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: John J. Elwell
  • Polyaromatic amides containing 1,3-butadiene units
    Patent number: 4359568
    Abstract: A process for synthesizing novel polyaromatic amides containing 1,3-butadiene groups along the polymer chain by effecting a reaction between the acid chloride of 1,4-bis-p-carboxyphenyl-1,3-butadiene and an aromatic diamine. These polyamides have been found to be especially useful as laminating resins for a variety of laminating applications.
    Type: Grant
    Filed: May 20, 1981
    Date of Patent: November 16, 1982
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Carl S. Marvel, Venkatesa Sankaran
  • Coprecipitation process for thermionic cathode type materials
    Patent number: 4359489
    Abstract: A method for fabricating a homogenous and uniformily sized mixture of alkaline earth metal carbonates found to be especially useful as an emission type coating material for application to a cathodic element of a thermionic vacuum tube.
    Type: Grant
    Filed: March 18, 1981
    Date of Patent: November 16, 1982
    Inventor: David M. Corneille
  • Taggants with explosive induced magnetic susceptibility
    Patent number: 4359399
    Abstract: A color-coded taggant for the post-detonation identification of explosive material. Retrieval of the taggnt after detonation of an explosive is facilitated by the addition of nickel formate to the taggant. The additive renders the taggant magnetically susceptible only after detonation. This eliminates the possiblity of the unauthorized removal of the taggant by a magnet before detonation but retains the advantages of facile retrieval by means of a magnet subsequent to detonation.
    Type: Grant
    Filed: August 27, 1980
    Date of Patent: November 16, 1982
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Carl Boyars