Patents by Inventor Steven Edward Schonfeld

Steven Edward Schonfeld 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 for curing polyurethanes
    Patent number: 4083901
    Abstract: Disclosed is a process for the uniform cure of polyurethane elastomers including the steps of mixing polyurethane prepolymers, having free isocyanate groups, with a stable curing agent complex to form a blend, thereafter transferring it to a suitable mold and subjecting it to a predetermined amount of microwave energy until it is substantially cured.
    Type: Grant
    Filed: August 29, 1975
    Date of Patent: April 11, 1978
    Assignee: The Firestone Tire & Rubber Company
    Inventors: Steven Edward Schonfeld, Georg Gustav Anton Bohm, Michael William Hayes
  • Catalysis of amine curable polymers by high dielectric constant compounds
    Patent number: 4046743
    Abstract: Amine curable polymers or prepolymers such as urethanes are cured by the use of a methylene dianiline complex or a racemic 2,3-di(4-aminophenyl) butane complex in the presence of a high dielectric constant catalytic compound which is relatively non-reactive with amines and isocyanates and exclusive of halogen containing foaming agents, halogen containing acids, and halogen containing flame retardants, so that increased cure rates, decreased cure temperatures or both are readily obtained.
    Type: Grant
    Filed: July 21, 1975
    Date of Patent: September 6, 1977
    Assignee: The Firestone Tire & Rubber Company
    Inventor: Steven Edward Schonfeld