Patents by Inventor Sven Barfoed

Sven Barfoed 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 preparing polyfuran foams
    Patent number: 4132683
    Abstract: Improved polyfuran foams are prepared by polymerizing or copolymerizing furfuryl alcohol, alone or in combination with prepolymers or precopolymers of furfuryl alcohol, as liquid feed material in the presence of a liquid acidic compound, the liquid feed material containing at least 20% of free furfuryl alcohol and wherein at least 50% of the hydroxyl groups in the mixture are present as free furfuryl alcohol. The liquid acidic compound or mixture of acidic compounds having a pKa value in water of from 1 to 4 or having a pka value in water of less than 1 and being uniformly distributed in mono alcohols that do not polymerize in the presence of said acidic compound or mixture of acidic compounds. The polyfuran foam having non-flammability characteristics as determined by the muffle furance test.
    Type: Grant
    Filed: September 27, 1976
    Date of Patent: January 2, 1979
    Assignee: Koninklijke Emballage Industrie Van Leer BV
    Inventors: Hans-Ole Larsen, Sven Barfoed, John A. G. Gent
  • Polyfuran foams and a method of preparing same
    Patent number: 3975319
    Abstract: A synthetic foam and a process for its preparation is disclosed comprising (a) a polymerized mass of at least 50 parts by weight of furfuryl alcohol, at least one part by weight of at least one amino compound selected from the group consisting of urea, thiourea and melamine, and up to 49 parts by weight formaldehyde, and (b) an equal or less amount of filler.
    Type: Grant
    Filed: June 19, 1975
    Date of Patent: August 17, 1976
    Assignee: Wolff & Kaaber
    Inventors: Hans-Ole Larsen, Sven Barfoed, John Arthur Gooch Gent
  • Polyfuran foams and a method of preparing same
    Patent number: 3975318
    Abstract: A synthetic foam and a process for its preparation is disclosed comprising (a) a polymerized mass of at least 50 parts by weight of furfuryl alcohol, at least one part by weight of at least one amino compound selected from the group consisting of urea, thiourea and melamine, and up to 49 parts by weight formaldehyde, and (b) an equal or less amount of filler.
    Type: Grant
    Filed: June 19, 1975
    Date of Patent: August 17, 1976
    Assignee: Wolff & Kaaber
    Inventors: Hans-Ole Larsen, Sven Barfoed, John Arthur Gooch Gent