Patents by Inventor David B. Knowies

David B. Knowies 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).

  • Publication number: 20130065056
    Abstract: The present invention provides ophthalmic devices comprising at least one photochromic material which is an indeno-fused naphthopyran having a pi-conjugation extending group bonded to the 11-position of the indeno-fused naphthopyran, the pi-conjugation extending group having at least one pendent halo-substituted group bonded thereto. The pi-conjugation extending group extends the pi-conjugation system of said indeno-fused naphthopyran. The 13-position of the indeno-fused naphthopyran is substantially free of spiro-substituents. The invention further provides photochromic materials of specified structure, photochromic compositions, photochromic articles and optical elements that include the photochromic materials. Other non-limiting embodiments relate to methods of making the ophthalmic devices comprising photochromic materials.
    Type: Application
    Filed: March 12, 2012
    Publication date: March 14, 2013
    Inventors: Anu Chopra, Jun Deng, Beon-Kyu Kim, David B. Knowies, Frank F. Molock, JR., Victor A. Montes, Stephen D. Straight, Wenjing Xiao, Huayun Yu