Patents by Inventor Guido E. Smits

Guido E. Smits 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).

  • Cellular polymer containing perforated cell windows and a process for the preparation thereof
    Patent number: 5312846
    Abstract: A process for preparing a cellular polymer containing perforated cell windows in the presence of a perforating agent being a substance that has a critical surface free energy of less than about 23 mj/m.sup.2 is disclosed. The cellular polymers obtained according to this invention have a fine cell structure and show enhanced dimensional and thermal insulation stability. The invention also relates to rigid polyurethane foam prepared in the presence of, for example, particulate poly(tetrafluoroethylene) or a liquid polyfluoro- or perfluorocarbon, with a boiling point of at least 130.degree. C., as perforating agent.
    Type: Grant
    Filed: June 22, 1993
    Date of Patent: May 17, 1994
    Assignee: The Dow Chemical Company
    Inventors: Guido E. Smits, Johan A. Thoen