Patents by Inventor James H. Nakahara

James H. Nakahara 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).

  • Perfluoroalkyl and perfluoroalkylether substituted aromatic phosphates, phosphonates and related compositions
    Patent number: 5550277
    Abstract: Perfluoroalkyl and perfluoroalkylether substituted aromatic phosphates, phosphonates and related compositions prepared by reaction of pefluoroalkyl or pefluoroakylether substituted phenols with mono- and dihalophosphite and primary and secondary phosphonyl halides are disclosed. These materials are useful as antioxidant, anticorrosion, antirust, and lubricity enhancing agents for perfluoropolyalkylether fluids.
    Type: Grant
    Filed: January 19, 1995
    Date of Patent: August 27, 1996
    Inventors: Kazimiera J. L. Paciorek, Wen-Huey Lin, Steven R. Masuda, James H. Nakahara
  • Precursor for A1NBN ceramic and method of use
    Patent number: 4946809
    Abstract: A soluble, processible ceramic precursor, comprising A1N and BN in fixed proportion, which on pyrolysis is transformed into pure carbon free A1NBN ceramic, of the formula:R.sub.3 N.X.sub.2 A1n(SiR'.sub.3)B(NH.sub.2)NHSiR'.sub.3wherein R and R' are independently lower alkyl groups or isomers thereof having from one to about five carbon atoms.Also disclosed are methods for making the precursor, and methods for thermally decomposing the precursor to form coatings, thin films, and shaped articles of substantially pure A1NBN ceramic.
    Type: Grant
    Filed: May 26, 1989
    Date of Patent: August 7, 1990
    Assignee: Ultraystems Defense and Space, Inc.
    Inventors: Kazimiera J. L. Paciorek, James H. Nakahara
  • Halo-substituted diphospha-s-triazines and their derivatives
    Patent number: 4559175
    Abstract: This invention concerns itself with a novel class of dihalodiphospha-s-triazines as exemplified by the compound 1,3-bis[phenylchloro-phospha]-5-perfluoro-n-heptyl-2,4,6-triazines as well as their thio and azido substituted derivatives.
    Type: Grant
    Filed: April 19, 1984
    Date of Patent: December 17, 1985
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Kazimiera J. L. Paciorek, Reinhold H. Kratzer, David H. Harris, Mark E. Smythe, James H. Nakahara
  • Dihalo-monophospha-s-triazines and their derivatives
    Patent number: 4557869
    Abstract: This invention concerns itself with a class of novel dihalo-substituted monophospha-s-triazines as exemplified by the compounds 1-dichlorophospha-3,5-bis(perfluoro-n-heptyl)-2,4,6-triazine and 1-dichlorophospha-3,5-bis[C.sub.3 F.sub.7 OCF(CF.sub.3)CF.sub.2 OCF(CF.sub.3)]-2,4,6-triazine, as well as their thio and azido derivatives.
    Type: Grant
    Filed: April 19, 1984
    Date of Patent: December 10, 1985
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Kazimiera J. L. Paciorek, Reinhold H. Kratzer, David H. Harris, Mark E. Smythe, James H. Nakahara
  • Unsymmetrical diphosphatetraazacyclooctatetraenes
    Patent number: 4297510
    Abstract: A method for preparing unsymmetrical diphosphatetraazacyclooctatetraenes and the novel products produced thereby. The synthesis involves an interaction between an imido-tetraaryl-diphosphinic acid trihalide and a perfluorinated imidoylamidine in the presence of an acid acceptor.
    Type: Grant
    Filed: June 26, 1980
    Date of Patent: October 27, 1981
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Kazimiera J. L. Paciorek, Reinhold H. Kratzer, Thomas I. Ito, James H. Nakahara
  • Symmetrical diphosphatetraazacyclooctatetraenes
    Patent number: 4281185
    Abstract: A method for synthesizing symmetrical diphosphatetraazacyclooctatetraenes and the products produced thereby. The synthesis involves effecting a reaction between a diaryltrihalophosphorane of a perfluoroalkyl amidine in the presence of an acid acceptor.
    Type: Grant
    Filed: June 26, 1980
    Date of Patent: July 28, 1981
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Kazimiera J. L. Paciorek, Reinhold H. Kratzer, Thomas I. Ito, James H. Nakahara
  • Diphospha-s-triazines
    Patent number: 4215072
    Abstract: Diphospha-s-triazines wherein the two phosphorus atoms are substituted by aromatic groups and the carbon atom is substituted by either a perfluoroalkyl or a perfluoroalkylether moiety. The triazines exhibit a broad range of properties and are useful as antioxidant-anticorrosion agents, lubricants, and hydraulic fluids.
    Type: Grant
    Filed: February 7, 1979
    Date of Patent: July 29, 1980
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Kazimiera J. L. Paciorek, Reinhold H. Kratzer, Jacquelyn Kaufman, Thomas I. Ito, James H. Nakahara
  • Perfluorinated polyalkylether based lubricant composition
    Patent number: 4194983
    Abstract: A lubricant composition comprising a perfluorinated polyalkylether base fluid and a minor amount of a diphospha-s-triazine in which the two phosphorus atoms are substituted by aromatic groups and the carbon atom is substituted by a perfluoroalkyl or perfluoroalkylether moiety.
    Type: Grant
    Filed: February 6, 1979
    Date of Patent: March 25, 1980
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Kazimiera J. L. Paciorek, Reinhold H. Kratzer, Jacquelyn Kaufman, Thomas I. Ito, James H. Nakahara