Patents by Inventor Steven R. Leijenaar

Steven R. Leijenaar 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).

  • Copolymer of carbon monoxide and ethylene containing ketal structures
    Patent number: 5565546
    Abstract: Copolymers comprising carbon monoxide and ethylene contain at least one type of ketal structure and possess enhanced thermal stability so as to be useful in the melt processing of fibers. These novel copolymers, as well as known polyketones with ketal structures, can be formed by treating a copolymer of carbon monoxide and at least one olefin with a mixture of acid, such as a sulfonic acid, which acts as a catalyst or catalyst/reagent, and alcohol, such as a lower alkanol.
    Type: Grant
    Filed: May 5, 1995
    Date of Patent: October 15, 1996
    Assignee: Akzo Nobel NV
    Inventors: Paul K. Hanna, Andrzej M. Piotrowski, Bert J. Lommerts, Steven R. Leijenaar, Gerrit Hoentjen