Patents by Inventor Charles H. Fuchsman

Charles H. Fuchsman 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).

  • Photochromic compounds
    Patent number: 4342668
    Abstract: Photochromic compounds of the formula ##STR1## wherein one of R.sub.1 and R.sub.2 is halogen or lower alkoxy, and the other is hydrogen, R.sub.3 and R.sub.4 are hydrogen, lower alkyl, lower alkoxy, or halogen and R.sub.5 is an alkyl of 2 to 10 carbons, and their use in lenses are disclosed.
    Type: Grant
    Filed: July 28, 1980
    Date of Patent: August 3, 1982
    Assignee: American Optical Corporation
    Inventors: Richard J. Hovey, Nori Y. C. Chu, Peter G. Piusz, Charles H. Fuchsman
  • Photochromic compounds
    Patent number: 4215010
    Abstract: Photochromic compounds of the formula ##STR1## wherein one of R.sub.1 and R.sub.2 is halogen or lower alkoxy, and the other is hydrogen, and R.sub.3 and R.sub.4 are hydrogen, lower alkyl, lower alkoxy, or halogen and their use in lenses are disclosed.
    Type: Grant
    Filed: September 8, 1978
    Date of Patent: July 29, 1980
    Assignee: American Optical Corporation
    Inventors: Richard J. Hovey, Nori Y. C. Chu, Peter G. Piusz, Charles H. Fuchsman