Patents by Inventor Pierluigi Guardigli

Pierluigi 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).

  • Patent number: 4334057
    Abstract: Polymers are continuously recovered from their latexes obtained by polymerization in emulsion by a process comprising the following steps:(A) feeding the polymeric latexes containing 10 to 50% by weight of polymer, at a temperature of from 10.degree. to 120.degree. C., through one or more feeding channels, to the narrow zone or to the divergent section of a nozzle in which water vapor flows at sonic or supersonic speed respectively, according to vapor/latex feeding ratios of 0.1-2 Kg of vapor/Kg of latex, where the latex is subdivided by the water vapor into a dispersion of particles; and(B) continuously feeding the dispersion obtained in step (A) to a tube or an exchanger of the type tube-in-tube directly connected with the divergent section of the nozzle where the dispersion, at a temperature of 100.degree.-150.degree. C. for residence times of from 0.1 to 1 second, maintains a speed of 50-150 m/sec.
    Type: Grant
    Filed: December 19, 1980
    Date of Patent: June 8, 1982
    Assignee: Montedison S.p.A.
    Inventors: Gabriele Govoni, Gianfranco Rubichi, Pierluigi Guardigli
  • Patent number: 4212967
    Abstract: Solid polycarbonate is recovered continuously from solutions thereof in organic solvents by a process consisting of:(a) subdividing the polycarbonate solution by steam (water vapor) at either sonic or ultra-sonic speed by means of a De Laval type nozzle;(b) conveying the dispersion thus obtained into a tubular heat exchanger having an increasing cross-section, preferably spirally-shaped or with elbow stretches having a thermal exchange coefficient of 500-1500 Kcal/h.m.sup.2 .degree.C., in which the heat dispersion is kept at 100.degree.-140.degree. C. for periods of time comprised between 0.05 and 5 seconds;(c) separating the solid from the vapors in a cyclone;(d) drying of the solid in a water vapor fluid bed.
    Type: Grant
    Filed: February 22, 1979
    Date of Patent: July 15, 1980
    Assignee: Montedison S.p.A.
    Inventors: Gabriele Govoni, Giovanni Di Drusco, Canzio Corazzari, Pierluigi Guardigli