Patents by Inventor Frederick PREHN, JR.

Frederick PREHN, JR. 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).

  • FIRE RETARDANT POLYCARBONATE COMPOSITIONS FOR TRANSPARENT THIN-WALL APPLICATIONS
    Publication number: 20240010832
    Abstract: A flame retardant composition comprising: a polycarbonate; a branched polycarbonate comprising bisphenol carbonate units, 0.01 to 1.0 mol % of a repeating unit derived from a monomer having a pendant ester group, or a combination thereof, and repeating units derived from a branching agent based on the total moles of the composition; a linear polycarbonate comprising bisphenol carbonate units and 0.01 to 1.0 mol % of a repeating unit derived from a monomer having a pendant ester group based on the total moles of the composition; a flame retardant comprising an alkyl sulfonate, an aromatic sulfonate, an aromatic sulfone sulfonate, an aromatic organophosphorus compound, or a combination thereof, and optionally a cyclic siloxane; optionally, an additive composition; and optionally, a filler.
    Type: Application
    Filed: December 14, 2021
    Publication date: January 11, 2024
    Inventors: Fabrizio MICCICHE, Frederick PREHN, JR., Jan Henk KAMPS, Robert Dirk VAN DE GRAMPEL