Patents by Inventor Raymond L. June

Raymond L. June 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).

  • Patent number: 5554657
    Abstract: The invention described herein provides a process for recycling a mixed polymer recycle stream containing polyester polymers, particularly polyethylene terephthalate (PET) typically in the form of carbonated soft drink or other containers. This novel process includes the steps of: (1) contacting the mixed polymer recycle stream with a solvent which selectively dissolves the PET. (2) separating the selective solvent containing PET from the residual mixed polymer, (3) cooling the selective solvent to precipitate the PET, and (4) removing the selective solvent from the precipitated PET. It is preferable that the mixed polymer recycle stream be prepared for recycling by conventional steps, such as water washing. In a preferred embodiment, the mixed polymer recycle stream is chemically washed subsequent to water washing and prior to contact with the selective solvent. The PET recovered is preferably combined with "virgin" PET and further processed to increase its molecular weight.
    Type: Grant
    Filed: May 8, 1995
    Date of Patent: September 10, 1996
    Assignee: Shell Oil Company
    Inventors: Thomas F. Brownscombe, Howard L. Fong, Zaida Diaz, Hoe H. Chuah, Raymond L. June, Kevin L. Rollick, Thomas C. Semple, Mark R. Tompkin