Patents Assigned to Vision-Ease Lens
  • Photochromic spironaphthopyran compounds
    Patent number: 5679805
    Abstract: A naphthopyran compound represented by the formula: ##STR1## wherein A and B are each selected from the following group: a substituted divalent cyclic radical, a substituted divalent aromatic radical, and a substituted divalent fused heterocyclic radical.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: October 21, 1997
    Assignee: Vision-Ease Lens, Inc.
    Inventor: Frank J. Hughes
  • Photochromic articles
    Patent number: 5658502
    Abstract: A photochromic article comprising a host material and a photochromic amount of a photochromic compound or a structural isomer of the photochromic compound, the photochromic compound represented by the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.4, R.sub.5, R.sub.6, R.sub.8, A, B, C, and D are each selected from the group consisting essentially of hydrogen, a stable organic radical, a heterocyclic group, halogen, a nitrogen-substituted radical, and a nitrogen-substituted ring radical.
    Type: Grant
    Filed: October 30, 1995
    Date of Patent: August 19, 1997
    Assignee: Vision-Ease Lens, Inc.
    Inventor: Frank J. Hughes
  • Photochromic spironaphthopyran compounds
    Patent number: 5628935
    Abstract: A naphthopyran compound represented by the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.5, R.sub.6, R.sub.7, R.sub.8, R.sub.9, and R.sub.10 are each selected from the group consisting essentially of hydrogen, a stable organic radical, a heterocyclic group, a halogen, a nitrogen-substituted group, and a nitrogen-substituted ring compound and wherein A is a substituted divalent aromatic radical that includes substituents selected from the group consisting essentially of hydrogen and the stable organic radical.
    Type: Grant
    Filed: October 28, 1994
    Date of Patent: May 13, 1997
    Assignee: Vision-Ease Lens, Inc.
    Inventors: Frank J. Hughes, Edward A. Travnicek