Patents by Inventor Alain Hinnen

Alain Hinnen 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).

  • Synthesis of photochromic indolinespiropyrans
    Patent number: 3950356
    Abstract: Photochromic indolinespiropyrans are formed in a substantially pure state by the reaction of a 2-alkyleneindoline and an orthohydroxyl aromatic aldehyde dissolved in dimethylformamide.
    Type: Grant
    Filed: March 5, 1970
    Date of Patent: April 13, 1976
    Assignee: Saint-Gobain Industries
    Inventor: Alain Hinnen