Patents by Inventor Xuzhi Qin

Xuzhi Qin 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).

  • Oxygen-containing heterocyclic fused naphthopyrans
    Patent number: 6608215
    Abstract: Novel naphthopyrans having an oxygen-containing heterocyclic group F annelated on the f, i, j, or k side of the naphthopyran ring. These naphthopyrans may have the formula (I) presented below: These compounds (I) have interesting photochromic properties. Various organic host materials that contain such compounds are described. Articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds or combinations are enabled.
    Type: Grant
    Filed: September 20, 2001
    Date of Patent: August 19, 2003
    Assignee: Vision-Ease Lens, Inc.
    Inventor: Xuzhi Qin
  • Photochromic naphthopyran compounds: compositions and articles containing those naphthopyran compounds
    Publication number: 20030146419
    Abstract: A photochromic naphthopyran displays good color distribution when the naphthopyran has a central nucleus of the formula: 1
    Type: Application
    Filed: November 20, 2001
    Publication date: August 7, 2003
    Applicant: Vision-Ease Lens, Inc.
    Inventor: Xuzhi Qin
  • Oxygen-containing heterocyclic fused naphthopyrans
    Publication number: 20030092918
    Abstract: Novel naphthopyrans having an oxygen-containing heterocyclic group F annelated on the f, i, j, or k side of the naphthopyran ring.
    Type: Application
    Filed: September 20, 2001
    Publication date: May 15, 2003
    Applicant: Vision-Ease Lens, Inc.
    Inventor: Xuzhi Qin
  • Novel naphthopyran compounds, photoresponsive compositions and lenses
    Publication number: 20020080451
    Abstract: A photochromic [1,2-b] naphthopyran having a fluoro substituent in at least one of the 7-position or the 9-position of the naphthopyran provides a stable photochromic compound with a narrow range of absorption. A preferred photochromic naphthopyran has the 2-position of the naphthopyran with two aromatic substituents thereon. It is further preferred to have at least one 2-position aromatic substituent comprising a phenyl group.
    Type: Application
    Filed: December 21, 2000
    Publication date: June 27, 2002
    Applicant: Vision-Ease Lens, Inc.
    Inventors: Frank J. Hughes, Xuzhi Qin, J. Thomas Ippoliti