Patents by Inventor Maria Lucia Wis

Maria Lucia Wis 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).

  • Stabilizing mixtures for organic polymers comprising a pyrazolone, an organic phosphite or phosphonite and a hindered phenol
    Patent number: 6605658
    Abstract: Stabilizing mixtures for organic polymers comprising: a) at least one compound belonging to the group of pyrazolones; b) at least one compound belonging to the group of organic phosphites or phosphonites; c) at least one compound belonging to the group of sterically hindered phenols; and d) at least one compound belonging to the group of sterically hindered amines. The above mixtures are useful in the stabilization to degradation caused by oxygen, heat and/or light, of organic polymers.
    Type: Grant
    Filed: November 22, 2000
    Date of Patent: August 12, 2003
    Assignee: Great Lakes Chemical (Europe) GmbH
    Inventors: Fabio Broussard, Daniele Girelli, Maria Lucia Wis, Carlo Neri, Vincenzo Malatesta
  • Photochromatic compounds, process for their preparation and their use in polymeric materials
    Patent number: 6414057
    Abstract: Photochromic compounds belonging to the group of spiro-isoindolino-oxazines having general formula (I). The above photochromatic compounds having general formula (I) have excellent photochromic characteristics, excellent stress resistance and high dyability characteristics.
    Type: Grant
    Filed: March 6, 2000
    Date of Patent: July 2, 2002
    Assignee: Great Lakes Chemical (Europe) GmbH
    Inventors: Luciana Crisci, William Giroldini, Vincenzo Malatesta, Maria Lucia Wis
  • Photochromatic compounds in the sold state, process for their preparation and their use in polymeric materials
    Publication number: 20020006589
    Abstract: Photochromatic compounds in the solid state belonging to the group of chromenes and spiro-pyrans, having general formula (I): 1
    Type: Application
    Filed: March 6, 2001
    Publication date: January 17, 2002
    Inventors: Vincenzo Malatesta, Jonathan Hobley, William Giroldini, Maria Lucia Wis