Patents by Inventor Michael P. Zielinski

Michael P. Zielinski 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: 5061735
    Abstract: Thermoplastic materials are separated and recovered, according to the present invention, utilizing a process wherein a mixture of the thermoplastic material to be recovered and one or more contaminants are simultaneously heated and agitated. The mixture is heated to the temperature at which the thermoplastic will adhere to itself, but at which the contaminant has not become tacky. Impacting thermoplastic particles agglomerate, while the contaminant particles do not adhere to other contaminant particles or to the thermoplastic particles. The resulting mixture is passed through a series of screens of increasing mesh size to separate the larger thermoplastic particles from the smaller contaminant particles.
    Type: Grant
    Filed: August 15, 1990
    Date of Patent: October 29, 1991
    Assignee: Plastic Recovery Systems, Inc.
    Inventor: Michael P. Zielinski