Patents by Inventor Frank N. Hirosawa

Frank N. Hirosawa 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).

  • Polyurethane cross-linking agents
    Patent number: 4031049
    Abstract: Polyurethane elastomers, low density high resiliency polyurethane foams and compositions and processes for preparing urethane foams and elastomers comprising reacting a mixture of a polyalkylene polyol having reactive hydrogen atoms as determined by the Zerewitinoff method exhibiting a molecular weight of at least 500, at least one organic polyisocyanate, and as a cross-linking agent at least one sulfur-containing polyamine compound exhibitng the formula: ##STR1## wherein R is a hydrocarbon, and R' is selected from the group consisting of hydrogen, halogens, and hydrocarbons.
    Type: Grant
    Filed: April 22, 1974
    Date of Patent: June 21, 1977
    Assignee: Furane Plastics, Inc.
    Inventors: Frank N. Hirosawa, Ming H. Lee