Patents by Inventor Jeffrey I. Rosenfeld

Jeffrey I. Rosenfeld 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 recovery of aromatic acid or ester and polyol from waste polyester resins
    Patent number: 5502247
    Abstract: Processes are disclosed for recovery and purification of dibasic aromatic acids or esters thereof from waste polyester film, fiber, bottles, manufacturing residues, and other manufactured articles.
    Type: Grant
    Filed: November 17, 1994
    Date of Patent: March 26, 1996
    Assignee: Amoco Corporation
    Inventors: Thomas M. Bartos, Bruce I. Rosen, Jeffrey I. Rosenfeld
  • Process for preparation of crude terephthalic acid suitable for reduction to prepare purified terephthalic acid
    Patent number: 5200557
    Abstract: A process is disclosed for counter-current positive displacement of an aliphatic carboxylic acid of 1 to 5 carbon atoms from a filter cake of an aromatic polycarboxylic acid containing the aliphatic carboxylic acid wherein mother liquor retained by the aromatic polycarboxylic acid has a concentration of the aliphatic carboxylic acid of 5000 ppmw, or less, based upon weight of the aromatic polycarboxylic acid present. This method is useful for the manufacture of crude terephthalic acid which is used after purification for the preparation of polyesters used for the manufacture of fabrics, fibers and plastic bottles.
    Type: Grant
    Filed: January 15, 1992
    Date of Patent: April 6, 1993
    Assignee: Amoco Corporation
    Inventors: John C. Gee, Jeffrey I. Rosenfeld, Thomas M. Bartos
  • Process for obtaining narrow molecular weight distribution in vinyl aromatic mass polymerization system
    Patent number: 4713421
    Abstract: In a process for the mass polymerization of vinyl aromatic monomer wherein vinyl aromatic monomer is polymerized in successive stages of increasing temperature, the improvement which narrows the molecular weight distribution of the resulting polymer comprising incorporating a polymerization inhibiting agent into a polymerizing mass at a point where about 60 to about 95% of monomer is converted to polymer.
    Type: Grant
    Filed: May 10, 1984
    Date of Patent: December 15, 1987
    Assignee: Standard Oil Company (Indiana)
    Inventors: Richard A. Hall, Jeffrey I. Rosenfeld