Patents by Inventor Yoshiyuki Dohmoto

Yoshiyuki Dohmoto 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 polyurethane-modified polyisocyanurate foam
    Patent number: 6638989
    Abstract: Rigid foams having excellent compression strength, dimensional stability, flame retardance and adhesion are produced by reacting an active hydrogen compound having at least two functionalities with a polyisocyanate compound in the presence of a catalyst and a blowing agent comprising either water alone or a mixture of water and a low boiling compound, wherein (1) the polyisocyanate compound is a prepolymer obtained by reacting a polymeric MDI with 5 to 30% by weight, based on the polymeric MDI, of a polyether polyol and/or polyester polyol having a hydroxyl value of at most 100 mg KOH/g, and (2) the number of isocyanate groups in the polyisocyanate compound is at least 1.5 times by mole as large as the number of active hydrogen atoms in the active hydrogen compound and water.
    Type: Grant
    Filed: November 16, 2001
    Date of Patent: October 28, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Yoshiyuki Dohmoto, Masayuki Fujidai
  • Method of preparing polyurethane-modified polyisocyanurate foam
    Publication number: 20020120029
    Abstract: Rigid foam excellent in compression strength, dimensional stability, flame retardancy and adhesion is produced.
    Type: Application
    Filed: November 16, 2001
    Publication date: August 29, 2002
    Inventors: Yoshiyuki Dohmoto, Masayuki Fujidai