Patents Assigned to Safetech, Inc.
  • Recovery method for polyester still bottoms
    Patent number: 4013519
    Abstract: A recovery method by means of which an antimony compound is separated from polyester still bottoms. If desired, the method can be employed so as to recover in usable form, the antimony compound, and the monomers polymerized to produce the polyester.
    Type: Grant
    Filed: March 25, 1976
    Date of Patent: March 22, 1977
    Assignee: Safetech, Inc.
    Inventors: Bruce Noel Hoppert, Alfred Berghausen, III
  • Method for recovering terephthalic acid and ethylene glycol from polyester materials
    Patent number: 3952053
    Abstract: The process described herein relates to a process for recovering terephthalic acid and ethylene glycol from polyester materials produced from terephthalic acid and ethylene glycol.
    Type: Grant
    Filed: February 26, 1974
    Date of Patent: April 20, 1976
    Assignee: Safetech, Inc.
    Inventors: George E. Brown, Jr., Richard C. O'Brien