Patents by Inventor Steven J. Shaw

Steven J. Shaw 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).

  • Method of preparing toughened epoxy polymers
    Patent number: 4990587
    Abstract: Toughened epoxy resins are prepared by curing a mixture of epoxy resin, a liquid carboxyl-terminated elastomer, and, as curing agent, a non-aromatic heterocyclic amine or a salt thereof. Cure is in two stages, the first stage at a temperature of at least 135.degree. C. for less than two hours to provide a partly cured formulation comprising phase-separated rubbery particles in an epoxy resin matrix, and a second stage of completing the cure.
    Type: Grant
    Filed: January 4, 1990
    Date of Patent: February 5, 1991
    Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom and Northern Ireland
    Inventors: Steven J. Shaw, David A. Tod