Patents by Inventor Dario Stefani

Dario Stefani 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).

  • Flexible polyurethane foams and process for preparing them
    Patent number: 5397811
    Abstract: Flexible polyurethane foams having densities lower than 25 kg/m.sup.3 and a load bearing capacity, at a 40% compression, higher than 150N, prepared by reacting a modified polyiso=cyanate with a compound containing active end hydrogens and wherein high levels of water are used as foaming agent, without risk of self-ignition.
    Type: Grant
    Filed: April 19, 1993
    Date of Patent: March 14, 1995
    Assignee: Enichem S.p.A.
    Inventors: Gianflavio Lunardon, Dario Stefani
  • Process for preparing low-density flexible polyurethane foams, and the polyurethane foams obtained
    Patent number: 5340845
    Abstract: A process for preparing low-density flexible polyurethane foams obtained, in the absence of expanding agents of chlorofluoroalkane type, by the polycondensation of an organic polyisocyanate with at least one polyol of equivalent weight exceeding 50 and functionality equal to or greater than 2, in the presence of an expanding system comprising water and dimethyl carbonate (DMC).
    Type: Grant
    Filed: July 21, 1993
    Date of Patent: August 23, 1994
    Assignee: Enichem, S.p.A.
    Inventors: Dario Stefani, Felix O. Sam, Gianflavio Lunardon