Patents by Inventor Peter Kafer

Peter Kafer 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 isolation of polycarbonates based on 4,4'-dihydroxydiphenyl sulphones
    Patent number: 4404351
    Abstract: The present invention relates to a process for the isolation of polycarbonates containing 18 to 45 mol % of structural units consisting of sulphone-bisphenols, characterized in that the sulphone-bisphenols are subjected to a polycondensation reaction with oligocarbonates containing chloroformic acid ester end groups, the phases are separated, the organic phase is purified and the sulphone-bisphenol polycarbonates are isolated.
    Type: Grant
    Filed: September 20, 1982
    Date of Patent: September 13, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Peter Kafer, Leo Morbitzer, Dieter Neuray, Wolfgang Cohnen, Werner Nouvertne
  • Copolyester carbonates and the admixture thereof with known polycarbonates to give thermoplastic moulding compositions
    Patent number: 4400491
    Abstract: The new thermoplastic copolyester carbonates which are based on polybutylene glycols and hexahydrophthalic acid or trimethyladipic acid, as well as admixtures of copolyester carbonates of this type with known polycarbonates are suitable for thermoplastic moulding compositions, particularly where good stability to solvents, such as petrol, is required.
    Type: Grant
    Filed: May 17, 1982
    Date of Patent: August 23, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Peter Kafer, Leo Morbitzer, Werner Nouvertne, Dieter Neuray