Patents by Inventor Hanoi Kwong

Hanoi Kwong 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).

  • Preparation of crosslinked 1,2,4-oxadiazole polymer
    Patent number: 4273918
    Abstract: New crosslinked 1,2,4-oxadiazole elastomers have been prepared by thermally condensing (a) monomer having the formula H.sub.2 N(HON)C-R-Q, wherein Q is a triazine ring-forming group such as nitrile or amidine or a mixture of such group with amidoxime, or (b) a mixture of said monomer with R[C(NOH)NH.sub.2 ].sub.2, with R in these formulas standing for a bivalent organic radical having the formula--(CX.sub.2).sub.p -, or --CFY(OCF.sub.2 CFY).sub.m O(CX.sub.2).sub.p O(CFYCF.sub.2 O).sub.n CFY--wherein X is fluorine or hydrogen, Y is fluorine or trifluoromethyl, p ranges from 1 to 18, and m+n ranges from 2 to 7. In the monomer charge, the overall proportions of amidoxime groups to triazine ring-forming groups varies depending on the extent of crosslinking desired in the final polymer.
    Type: Grant
    Filed: April 30, 1980
    Date of Patent: June 16, 1981
    Assignee: The United States of America as represented by the United States National Aeronautics and Space Administration
    Inventors: Robert W. Rosser, Ibrahim M. Shalhoub, Hanoi Kwong
  • Bifunctional monomers having terminal oxime and cyano or amidine groups
    Patent number: 4269787
    Abstract: New crosslinked 1,2,4-oxadiazole elastomers have been prepared by thermally condensing (a) monomer having the formula H.sub.2 N(HON)C--R--Q, wherein Q is a triazine rig-forming group such as nitrile or amidine or a mixture of such group with amidoxime, or (b) a mixture of said monomer with R[C(NOH)NH.sub.2 ].sub.2, with R in these formulas standing for a bivalent organic radical having the formula--(CX.sub.2).sub.p --, or --CFY(OCF.sub.2 CFY).sub.m O(CX.sub.2).sub.p O(CFYCF.sub.2 O).sub.n CFY--wherein X is fluorine or hydrogen, Y is fluorine or trifluoromethyl, p ranges from 1 to 18, and m+n ranges from 2 to 7. In the monomer charge, the overall proportions of amidoxime groups to triazine ring-forming groups varies depending on the extent of crosslinking desired in the final polymer.
    Type: Grant
    Filed: April 30, 1980
    Date of Patent: May 26, 1981
    Inventors: Robert A. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Frosch, Robert W. Rosser, Ibrahim M. Shalhoub, Hanoi Kwong
  • 1,2,4-Oxadiazole elastomers
    Patent number: 4245085
    Abstract: New crosslinked 1,2,4-oxadiazole elastomers have been prepared by thermally condensing (a) monomer having the formula H.sub.2 N(HON)C-R-Q, wherein Q is a triazine ring-forming group such as nitrile or amidine, or (b) a mixture of said monomer with R[C(NOH)NH.sub.2 ].sub.2, with R in these formulas standing for a bivalent organic radical having the formula--(CX.sub.2).sub.p --, or --CFY(OCF.sub.2 CFY).sub.m O(CX.sub.2).sub.p O(CFYCF.sub.2 O).sub.n CFY--wherein X is fluorine or hydrogen, Y is fluorine or trifluoromethyl, p ranges from 1 to 18, and m+n ranges from 2 to 7. In the monomer charge, the overall proportions of amidoxime groups to triazine ring-forming groups varies depending on the extent of crosslinking desired in the final polymer.The heat and chemical resistant elastomers disclosed can serve, for instance, as adhesives, caulking compounds, channel sealants, fuel tank liners.
    Type: Grant
    Filed: April 9, 1979
    Date of Patent: January 13, 1981
    Inventors: Robert A. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Frosch, Robert W. Rosser, Ibrahim M. Shalhoub, Hanoi Kwong