Patents by Inventor Andrew D. Surnamer

Andrew D. Surnamer 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).

  • Membranes formed from rigid aromatic polyamides
    Patent number: 5034027
    Abstract: The present invention is a class of polymeric membranes formed from aromatic polyamides derived from dicarboxylic acid chlorides and cardo diamines having alkyl substituents on all portions ortho to the amine functions. These polyamide membranes exhibit high gas permselectivities and are useful in various gas separation applications.
    Type: Grant
    Filed: March 30, 1990
    Date of Patent: July 23, 1991
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Chao-Fong Tien, Andrew D. Surnamer, Michael Langsam
  • Membranes formed from rigid polyarylates
    Patent number: 5013332
    Abstract: The present invention is a class of polymeric membranes formed from aromatic polyarylates derived from dicarboxylic acid chlorides and conformationally rigid cyclohexyl bisphenols having halo or methyl substituents on all positions ortho to the hydroxy functions. These polarylate membranes exhibit high gas permselectivities and are useful in various gas separation applications.
    Type: Grant
    Filed: May 3, 1990
    Date of Patent: May 7, 1991
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Andrew D. Surnamer, Chao-Fong Tien
  • Membranes formed from aromatic polyarylates
    Patent number: 5007945
    Abstract: The present invention is a class of polymeric membranes formed from aromatic polyarylates derived from dicarboxylic acid chlorides and cardo bisphenols having halo substituents on all portions ortho to the hydroxy functions. These polyarylate membranes exhibit high gas permselectivities and are useful in various gas separation applications.
    Type: Grant
    Filed: April 12, 1990
    Date of Patent: April 16, 1991
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Chao-Fong Tien, Andrew D. Surnamer