Patents by Inventor Pier L. Guardigli

Pier L. Guardigli 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 preparing granular polycarbonate
    Patent number: 4252968
    Abstract: A continuous process for simultaneously drying, thickening and increasing the flowability and processibility of polycarbonate powders is disclosed. The powders are fed to a tubular drier equipped with a mechanical stirrer in which they are fluidized with the aid of a stream of heated inert gas or vapor flowing counter-currently to the powders.
    Type: Grant
    Filed: May 29, 1979
    Date of Patent: February 24, 1981
    Assignee: Montedison S.p.A.
    Inventors: Gabriele Govoni, Roberto Flammini, Remo Vaccari, Pier L. Guardigli