Patents by Inventor Ngo Q. Vu

Ngo Q. Vu 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).

  • Polymers containing alternating silsesquioxane and bridging group segments and process for their preparation
    Patent number: 5412053
    Abstract: A synthesis process for polysilsesquioxanes which produces a high yield, tractable copolymer of perfectly alternating silsesquioxane and bridging group segments is provided. A difunctional silsesquioxane monomer of the formula Si.sub.8 R.sub.8 O.sub.11 (OA).sub.2 or Si.sub.7 R.sub.7 O.sub.9 (OSiR.sup.4 R.sup.5 R.sup.6)(OA).sub.2 is reacted with a difunctional compound of the formula X--M--X which forms a bridging group for a time sufficient to condense the difunctional silsesquioxane monomers and bridging groups into a linear polymer containing alternating silsesquioxane and bridging group segments. The resulting linear copolymer is essentially free of impurities and has controllable properties through the proper selection of the monomeric starting materials.
    Type: Grant
    Filed: August 12, 1993
    Date of Patent: May 2, 1995
    Assignee: The University of Dayton
    Inventors: Joseph D. Lichtenhan, Ngo Q. Vu, Jeffrey W. Gilman, Frank J. Feher