Patents by Inventor Manfred Kyber

Manfred Kyber 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 preparing polybutylene terephthalate from pet scrap
    Patent number: 5266601
    Abstract: Process for producing polybutylene terephthalate with less than 1.0 wt % units derived from ethylene glycol from polyethylene terephthalate scrap by diolysis and ester exchange with 1,4-butanediol and subsequent polycondensation.
    Type: Grant
    Filed: August 17, 1992
    Date of Patent: November 30, 1993
    Assignee: Zimmer Aktiengesellschaft
    Inventors: Manfred Kyber, Wolfgang Schmidt, Uwe Schollar
  • Process for continuous polycondensation of terephthalic acid and 1,4-bis(hydroxymethyl)cyclohexane
    Patent number: 5198530
    Abstract: Process for continuous production of polyesters by esterification of terephthalic acid with 1,4-bis(hydroxymethyl)cyclohexane with a split feed in the presence of a titanium catalyst at 265.degree. to 305.degree. C. and 0.8 to 1.5 bar up to a conversion of 98.0% to 99.0%, then performing precondensation at 290.degree. to 305.degree. C. and 0.01 to 1.5 bar up to a conversion of 99.4% to 99.7% and finally performing polycondensation at 295.degree. to 310.degree. C. and less than 1.5 mbar up to a conversion corresponding to 50% to 95% of the maximum possible viscosity after adding more titanium catalyst.
    Type: Grant
    Filed: March 20, 1992
    Date of Patent: March 30, 1993
    Assignee: Zimmer Aktiengesellschaft
    Inventors: Manfred Kyber, Wolfgang Schmidt, Ulrich Thiele