Patents Assigned to Nelson Wasserman
  • Photochromic polymeric membrane
    Patent number: 5015416
    Abstract: A photochromic material adapted for coating light transmissive materials. The photochromic material contains photosensitive silver halide crystals having dimensions in the range of approximately 50 Angstroms to 800 Angstroms. The silver halide crystals are surface doped with copper ions and another sensitizer selected from mild reducing agents or sulfur-bearing ions. The crystals are dispersed in a protective polymer that does not irreversibly bind halogen.
    Type: Grant
    Filed: June 20, 1988
    Date of Patent: May 14, 1991
    Assignee: Nelson Wasserman
    Inventor: Jerome L. Reid