Patents by Inventor Alvaro Casati

Alvaro Casati 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 demonomerizing polycapronamide
    Patent number: 4376680
    Abstract: The process and an apparatus for separating and recovering caprolactam moer from polycapronamide are described. A process comprises subjecting a molten capronamide to the action of a vacuum while it flows as a thin layer, extracting therefrom caprolactam as a vapor and condensing the caprolactam vapor by contact with a stream of molten caprolactam, substantially under the same vacuum to which the polymer has been subjected. Preferably the caprolactam vapor and the molten caprolactam flow equicurrently, the molten caprolactam being suitably subdivided. Heat exchange intensifying surfaces are present in the equicurrent flow path. The molten caprolactam is circulated in a closed circuit.
    Type: Grant
    Filed: December 10, 1979
    Date of Patent: March 15, 1983
    Assignee: Snia Viscosa Societa' Nazionale Industria Applicazioni Viscosa S.p.A.
    Inventors: Edgardo Horak, Alvaro Casati, Giancarlo Bianucci, Luigi Marafioti, Silvio Notarbartolo