Patents by Inventor Johan A. Thoen

Johan A. Thoen 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).

  • Polyether polyol formulations for hard CFC replacement by water blowing in rigid polyurethane foams
    Patent number: 4943597
    Abstract: Rigid closed-cell polyisocyanate-based foams are prepared by the reaction of polyisocyanate with a polyol composition having an average hydroxyl number of about 100 to about 500 and comprising at least one polyether polyol containing four or more active hydrogens and having a hydroxyl number of from about 50 to about 500. The blowing of the foam is essentially with carbon dioxide generated from the reaction of water with polyisocyanate so as to provide foams of the desired density containing at least 40 mole percent carbon dioxide in their cells.
    Type: Grant
    Filed: December 7, 1988
    Date of Patent: July 24, 1990
    Assignee: The Dow Chemical Company
    Inventors: Henri J. M. Grunbauer, Johan A. Thoen, Guido F. Smits
  • Melamine-alkanolamine condensates and polyurethanes prepared therefrom
    Patent number: 4939182
    Abstract: Condensates of certain amino-substituted s-triazines, formaldehyde and alkanolamines are disclosed. These condensates can be used, with or without alkoxylation, in forming polyurethanes having desirable burn properties.
    Type: Grant
    Filed: July 27, 1988
    Date of Patent: July 3, 1990
    Assignee: The Dow Chemical Company
    Inventors: John E. Marugg, Johan A. Thoen, Michael A. P. Gansow