Patents by Inventor Madjid Rezaii-Djafari

Madjid Rezaii-Djafari 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).

  • Hydrogels based on fluorine-containing and saccharide monomers
    Patent number: 5214452
    Abstract: The invention relates to a hydrogel which is a copolymer of a polymerizable monomer mixture which containsa) 2-85 mol-% of a hydrophobic vinyl monomer with at least three fluorine atoms,b) 2-80 mol-% of a hydrophobic polyhydroxy vinyl monomer whose hydroxyl groups are in protected form,c) 2-70 mol-% of a hydrophilic vinyl monomer and,d) based on the total amount of monomers a)-c), 0-5 mol-% of a crosslinker, in which hydrogel the hydroxyl groups of the segments formed by the monomers b) are in protected or in free form.These hydrogels can be used, for example, as contact lenses, intraocular lenses or in other areas of application where biologically tolerated materials are required.
    Type: Grant
    Filed: July 17, 1992
    Date of Patent: May 25, 1993
    Assignee: Ciba-Geigy Corporation
    Inventors: Gerhard Kossmehl, Horst Schafer, Norbert Klaus, Jurgen Volkheimer, Madjid Rezaii-Djafari
  • Hydrogels based on fluorine-containing and saccharide monomers
    Patent number: 5155194
    Abstract: The invention relates to a hydrogel which is a copolymer of a polymerizable monomer mixture which containsa) 2-85 mol-% of a hydrophobic vinyl monomer with at least three fluorine atoms,b) 2-80 mol-% of a hydrophobic polyhydroxy vinyl monomer whose hydroxyl groups are in protected form,c) 2-70 mol-% of a hydrophilic vinyl monomer and,d) based on the total amount of monomers a)-c), 0-5 mol-% of a crosslinker, in which hydrogel the hydroxyl groups of the segments formed by the monomers b) are in protected or in free form.These hydrogels can be used, for example, as contact lenses, intraocular lenses or in other areas of application where biologically tolerated materials are required.
    Type: Grant
    Filed: May 20, 1991
    Date of Patent: October 13, 1992
    Assignee: Ciba-Geigy Corporation
    Inventors: Gerhard Kossmehl, Horst Schafer, Norbert Klaus, Jurgen Volkheimer, Madjid Rezaii-Djafari