Patents by Inventor John Rickard Bergstrom

John Rickard Bergstrom 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 of freeing cellulose fibers from lignocellulosic material by irradiation
    Patent number: 4000032
    Abstract: A process is provided for freeing cellulose fibers from lignocellulosic material, which comprises subjecting particulate lignocellulosic material to irradiation at a frequency within the range from about 10 to about 300,000 MHz (megahertz), at an intensity of at least 0.5 megajoule per kg. of material, applied in a short pulse having a duration of at most 0.1 second, at such an intensity the water present in the lignocellulosic material is rapidly and even explosively vaporized, and disrupts or destroys the natural structure of the lignocellulosic material, thereby freeing the fibers substantially without deleterious effect upon the length or strength of the fibers.
    Type: Grant
    Filed: September 23, 1975
    Date of Patent: December 28, 1976
    Assignee: Mo och Domsjo
    Inventors: John Rickard Bergstrom, Ernst Birger Tiberg