Patents by Inventor Frank Boos

Frank Boos 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 the synthesis of polyethylene carboxylate from polyethylene carboxylate waste
    Patent number: 5869543
    Abstract: The invention comprises a method for synthesizing polyethylene terephthalate from waste polyethylene terephthalate by cleavage with ethylene glycol and separation of bis(hydroxyethylene) terephthalate from the cleavage mixture with a specific temperature program, recrystallization from water, and esterification and polycondensation with the addition of terephthalic acid.The invention further comprises a method for synthesis of polyethylene naphthalate from waste polyethylene naphthalate in a similar manner.
    Type: Grant
    Filed: August 29, 1997
    Date of Patent: February 9, 1999
    Assignee: Zimmer Aktiengesellschaft
    Inventors: Frank Boos, Norman Schnittker, Joachim Seelig