Patents by Inventor Michel Frigoli

Michel Frigoli 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).

  • Potochromic liquid crystals
    Publication number: 20050258396
    Abstract: The invention relates to novel photochromic liquid crystal materials which may be used in various electro-optic devices including liquid crystal devices. The materials can be converted into another form on irradiation by light which may make it feasible for them to be addressed by light in electro-optic devices. The materials are based on 5-membered heterocycles.
    Type: Application
    Filed: June 26, 2003
    Publication date: November 24, 2005
    Applicant: QinetiQ Limited
    Inventors: Michel Frigoli, Georg Mehl
  • Photochromic naphtho [2,1-b]pyran compounds containing bithienyl or terthienyl substituents, process for their manufacture, and photochromic materials and articles obtained
    Patent number: 6312811
    Abstract: The photochromic compounds of the invention correspond to the formula: in which Th2 represents a bithienyl group in one of the positions 5 to 10 of the naphthenic ring system system, R1 denotes a bithienyl or trithienyl group and R2 denotes a bithienyl, trithienyl, aryl, naphthyl, thienyl, furyl, pyrrolyl or N-alkylpyrrolyl group.
    Type: Grant
    Filed: July 8, 1999
    Date of Patent: November 6, 2001
    Assignee: Essilor International Compagnie Generale d'Optique
    Inventors: Michel Frigoli, Nicole Rebiere-Galy, Corinne Moustrou, Andre Samat, Robert Guglielmetti
  • Photochromic [3H]naphtho[2,1-b]pyran compounds containing an acetylenic substituent, process for their manufacture, and photochromic materials and articles obtained
    Patent number: 6281366
    Abstract: The present invention relates to photochromic [3H]naphtho[2,1-b]pyran compounds containing an acetylenic substituent, process for their manufacture, and photochromic materials and articles obtained therefrom. The invention, in some specific aspects, relates to photochromic compounds having a [3H]naphtho-[2,1-b]pyran structure and bearing an acetylenic group in one of the positions 7 to 10 of the naphthopyran ring structure.
    Type: Grant
    Filed: February 29, 2000
    Date of Patent: August 28, 2001
    Assignee: Essilor International Compagnie Generale d'Optique
    Inventors: Michel Frigoli, Corinne Moustrou, André Samat, Robert Guglielmetti