Patents by Inventor Luke R. Kleiss

Luke R. Kleiss 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).

  • Salts of polybenzazole monomers and their use
    Patent number: 5276128
    Abstract: Salts that contain AA-PBZ monomer ions and BB-PBZ monomer ions can be precipitated from an aqueous solution by contacting soluble salts of the monomers in an aqueous solution. The monomer salt can be polymerized by ordinary techniques to form polybenzazole polymers without the need for devolatilization and with very accurate stoichiometric control.
    Type: Grant
    Filed: October 22, 1991
    Date of Patent: January 4, 1994
    Assignee: The Dow Chemical Company
    Inventors: Steven Rosenberg, Richard C. Krauss, Ming-Biann Liu, Luke R. Kleiss
  • Phosphate salts of monomers for PBZ and their use in preparing PBZ polymers
    Patent number: 5138020
    Abstract: PBZ polymers are synthesized by the reaction of AA- and BB-monomers. The BB-monomer is conveniently synthesized and isolated as a phosphate salt having a uniform number of phosphate ions associated with each BB-monomer ion. Such high purity monophosphate and diphosphate salts can be obtained by precipitating the monomer from an aqueous acid solution by adjusting the pH balance or from a mixture of phosphoric acid and a volatile, polar, saturated organic liquid at a relatively low temperature.
    Type: Grant
    Filed: April 21, 1989
    Date of Patent: August 11, 1992
    Assignee: The Dow Chemical Company
    Inventors: William J. Harris, Ming-Biann Liu, Luke R. Kleiss, Zenon Lysenko, Steven Rosenberg
  • Aqueous reduction process for halo-nitro-phenols
    Patent number: 5001265
    Abstract: An aminophenolic compound can be synthesized by contacting a halo-nitro-phenolic compound, such as 2-chloro-4,6-dinitrorescorcinol, with a hydrogenating agent, such as hydrogen, and a catalyst, such as palladium-on-carbon, in an aqueous solution in the presence of an acid such as phosphoric acid.
    Type: Grant
    Filed: July 28, 1989
    Date of Patent: March 19, 1991
    Assignee: The Dow Chemical Company
    Inventors: Ming-Biann Liu, Luke R. Kleiss