Patents by Inventor Paul Joonase

Paul Joonase 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).

  • Process for expanding
    Patent number: 4056587
    Abstract: Foam styrene polymer sheet is expanded to form foam products having lower density by a process which includes (a) contacting the foam styrene polymer sheet with an aqueous composition, (b) maintaining the aqueous composition in contact with the sheet to effect impregnation of the sheet by the aqueous composition, and thereafter (c) heating the impregnated sheet to expand the sheet. The expanded products are useful as thermal insulation and packaging material.
    Type: Grant
    Filed: October 20, 1975
    Date of Patent: November 1, 1977
    Assignee: W. R. Grace & Co.
    Inventors: Arvid Honkanen, Paul Joonase