Patents by Inventor David A. Dubowik

David A. Dubowik 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).

  • Epoxy resins cured with mixed methylene bridged poly(cyclohexyl-aromatic)amine curing agents
    Patent number: 5280091
    Abstract: This invention pertains to epoxy resins having increased chemical resistance to solvents, and good cured mechanical properties which are prepared by curing the epoxy resins with a curing agent comprising a mixture of methylene bridged poly(cyclohexyl-aromatic)amines. The methylene bridged poly(cyclohexyl-aromatic)amine curing agents are the residue obtained from the distillation of a mixture of poly(cyclohexylaromatic)amines formed by the hydrogenation of crude methylenedianiline or crude di(4-amino-3-methylcyclohexyl)methane.
    Type: Grant
    Filed: February 7, 1992
    Date of Patent: January 18, 1994
    Assignee: Air Products and Chemicals, Inc.
    Inventors: David A. Dubowik, Peter A. Lucas, Andrea K. Smith