Patents by Inventor Dave Knowles

Dave Knowles 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).

  • Curable photochromic compositions
    Patent number: 10954397
    Abstract: A curable photochromic composition can include: (a) a first component having a first compound with at least two active hydrogen-functional groups and an active hydrogen-functional group equivalent weight of at least 1000; (b) a second component having at least one of a polyisocyanate and a blocked polyisocyanate; and (c) at least one photochromic compound. The ratio of total isocyanate and blocked isocyanate equivalents of the second component to total active hydrogen-functional group equivalents of the first component is at least 4:1.
    Type: Grant
    Filed: August 17, 2015
    Date of Patent: March 23, 2021
    Assignee: Transitions Optical, Inc.
    Inventors: Michael Frank Haley, Anthony Thomas Gestrich, Dave Knowles, Stephen Robinson, Feng Wang, Elizabeth A. Zezinka, Linda K. Anderson
  • Curable Photochromic Compositions
    Publication number: 20180208781
    Abstract: A curable photochromic composition can include: (a) a first component having a first compound with at least two active hydrogen-functional groups and an active hydrogen-functional group equivalent weight of at least 1000; (b) a second component having at least one of a polyisocyanate and a blocked polyisocyanate; and (c) at least one photochromic compound. The ratio of total isocyanate and blocked isocyanate equivalents of the second component to total active hydrogen-functional group equivalents of the first component is at least 4:1.
    Type: Application
    Filed: August 17, 2015
    Publication date: July 26, 2018
    Inventors: Michael Frank Haley, Anthony Thomas Gestrich, Dave Knowles, Stephen Robinson, Feng Wang, Elizabeth A. Zezinka, Linda K. Anderson