Patents by Inventor Phillip Poliner Spiegelman

Phillip Poliner Spiegelman 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 recycling hydrogen when making blends of olefin copolymers
    Patent number: 3969470
    Abstract: A continuous process for recycling hydrogen for reuse in making blends of olefin copolymers of high and low molecular weights which comprises copolymerizing ethylene with at least one higher olefin monomer in a solvent in separate reactors in the presence of a coordination catalyst, at least one, but not all, of said reactors containing hydrogen in an amount sufficient to produce low molecular weight copolymer. The resulting solutions of high and low molecular weight copolymers are mixed, unreacted monomers and hydrogen are flashed from the mixture, and the copolymer blend is isolated from the unflashed residue.
    Type: Grant
    Filed: April 21, 1975
    Date of Patent: July 13, 1976
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Phillip Poliner Spiegelman