Patents by Inventor David B. Knowles

David B. 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).

  • Patent number: 5573712
    Abstract: Described are novel reversible photochromic naphthopyran compounds, examples of which are compounds having certain substituents at the number 5 and 6 carbon atoms of the naphtho portion of the naphthopyran and at the 2-position of the pyran ring. Certain substituents may also be present at the number 7, 8, 9 or 10 carbon atoms of the naphtho portion of the naphthopyran. Also described are organic host materials that contain or that are coated with such compounds. Articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds or combinations thereof with complementary photochromic compounds, e.g., spiro(indoline) type compounds, are also described.
    Type: Grant
    Filed: March 21, 1995
    Date of Patent: November 12, 1996
    Assignee: Transitions Optical, Inc.
    Inventors: Anil Kumar, Barry V. Gemert, David B. Knowles
  • Patent number: 5565147
    Abstract: Described are novel reversible photochromic diaryl-3H-naphtho[2,1-b]pyran compounds having a substituted or unsubstituted, five or six member heterocyclic ring fused to the g, i, or l side of the naphthopyran. The heterocyclic ring contains an oxygen or nitrogen atom and is attached to the number 5, 6, 7, 8, 9, or 10 carbon atom of the naphtho portion of the naphthopyran. Also described are organic host materials containing such compounds. Articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds or combinations thereof with complementary photochromic compounds, e.g., spiro(indoline)oxazine-type compounds, are also described.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: October 15, 1996
    Assignee: Transitions Optical, Inc.
    Inventors: David B. Knowles, Barry Van Gemert
  • Patent number: 5552090
    Abstract: Described are novel reversible photochromic naphthopyran compounds, examples of which are compounds substituted at the 3 position of the pyran ring with (i) an aryl substituent and (ii) a phenyl substituent having a 5- or 6-member heterocyclic ring fused at the number 3 and 4 carbon atoms of the phenyl substituent, and at the 6 position of the naphthyl portion of the naphthopyran compound with a nitrogen-containing heterocyclic ring. Also described are organic host materials that contain or that are coated with such compounds. Articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds or combinations thereof with complementary photochromic compounds, e.g., spiro(indoline) type compounds, are also described.
    Type: Grant
    Filed: December 20, 1994
    Date of Patent: September 3, 1996
    Assignee: PPG Industries, Inc.
    Inventors: Barry Van Gemert, David B. Knowles
  • Patent number: 5514817
    Abstract: Described are novel reversible photochromic phenanthropyran compounds, examples of which are substituted 2H-phenanthro 4,3-b!pyran and 3H-phenanthro 1,2-b!pyran compounds. The 2H-phenanthropyran compounds have certain substituents at the number 5 and 6 carbon atoms of the phenanthro portion of the phenanthropyran and at the 2 position of the pyran ring. Certain substituents may also be present at the number 7, 8, 9, 10, 11, or 12 carbon atoms of the phenanthro portion of the phenanthropyran. The 3H-phenanthropyran compounds have certain substituents at the number 11 and 12 carbon atoms of the phenanthro portion of the phenanthropyran and at the 3 position of the pyran ring. Certain substituents may also be present at the number 5, 6, 7, 8, 9, or 10 carbon atoms of the phenanthro portion of the phenanthropyran. Also described are polymeric organic host materials that contain or that are coated with such compounds.
    Type: Grant
    Filed: August 4, 1994
    Date of Patent: May 7, 1996
    Assignee: PPG Industries, Inc.
    Inventor: David B. Knowles
  • Patent number: 5464567
    Abstract: Described are novel reversible photochromic naphthopyran compounds which have two phenyl moieties adjacent to each oxygen of each pyran ring. The substituents on each pair of phenyl moieties mirror one another when the phenyl groups are substituted. The naphthodipyrans are prepared from .beta.,.beta.-dihydroxynaphthalene compounds.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: November 7, 1995
    Assignee: Transitions Optical, Inc.
    Inventors: David B. Knowles, Barry V. Gemert
  • Patent number: 5458814
    Abstract: Described are novel reversible photochromic naphthopyran compounds, examples of which are compounds having certain substituents at the number 5 and 6 carbon atoms of the naphtho portion of the naphthopyran and at the 2-position of the pyran ring. Certain substituents may also be present at the number 7, 8, 9 or 10 carbon atoms of the naphtho portion of the naphthopyran. Also described are organic host materials that contain or that are coated with such compounds. Articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds or combinations thereof with complementary photochromic compounds, e.g., spiro(indoline) type compounds, are also described.
    Type: Grant
    Filed: December 9, 1993
    Date of Patent: October 17, 1995
    Assignee: Transitions Optical, Inc.
    Inventors: Anil Kumar, Barry Van Gemert, David B. Knowles
  • Patent number: 5458815
    Abstract: Described are novel reversible photochromic naphthopyran compounds, examples of which are compounds substituted at the 3 position of the pyran ring with (i) an aryl substituent and (ii) a phenyl substituent having a 5- or 6-member heterocyclic ring fused at the number 3 and 4 carbon atoms of the phenyl substituent. Also described are organic host materials that contain or that are coated with such compounds. Articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds or combinations thereof with complementary photochromic compounds, e.g., spiro(indoline) type compounds, are also described.
    Type: Grant
    Filed: September 8, 1994
    Date of Patent: October 17, 1995
    Assignee: Transitions Optical, Inc.
    Inventor: David B. Knowles
  • Patent number: 5451344
    Abstract: Described are novel reversible photochromic diaryl-3H-naphtho[2,1-b]pyran compounds having a substituted or unsubstituted, five or six member heterocyclic ring fused to the g, i, or l side of the naphthopyran. The heterocyclic ring contains an oxygen or nitrogen atom and is attached to the number 5, 6, 7, 8, 9, or 10 carbon atom of the naphtho portion of the naphthopyran. Also described are organic host materials containing such compounds. Articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds or combinations thereof with complementary photochromic compounds, e.g., spiro(indoline)oxazine-type compounds, are also described.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: September 19, 1995
    Assignee: Transitions Optical, Inc.
    Inventors: David B. Knowles, Barry Van Gemert
  • Patent number: 5395567
    Abstract: A novel photochromic spironaphthopyran composition having the general structural formula: ##STR1## in which phenyl substituents positioned adjacent to the oxygen of the pyran ring are linked at their adjacent ortho positions by the functionality (R).sub.n wherein n is the integer 0-2 and wherein R is methylene (--CH.sub.2 --), vinylene (--C.dbd.C--), or a carbon-carbon bond, i.e., when n is 0. The groups R.sub.1 and R.sub.5 -R.sub.10 may be hydrogen or a variety of substituents.
    Type: Grant
    Filed: April 18, 1994
    Date of Patent: March 7, 1995
    Assignee: PPG Industries, Inc.
    Inventors: Barry Van Gemert, David B. Knowles
  • Patent number: 5384077
    Abstract: Described are novel reversible photochromic naphthopyran compounds, examples of which are compounds substituted at the 3 position of the pyran ring with (i) an aryl substituent and (ii) a phenyl substituent having a 5- or 6-member heterocyclic ring fused at the number 3 and 4 carbon atoms of the phenyl substituent. Also described are organic host materials that contain or that are coated with such compounds. Articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds or combinations thereof with complementary photochromic compounds, e.g., spiro(indoline) type compounds, are also described.
    Type: Grant
    Filed: June 21, 1993
    Date of Patent: January 24, 1995
    Assignee: Transitions Optical, Inc.
    Inventor: David B. Knowles
  • Patent number: 5369158
    Abstract: Described are novel reversible photochromic naphthopyran compounds substituted at the number eight carbon atom on the naphtho portion of the naphthopyran ring with, for example, a methoxy group. Also described are organic host materials that contain or that are coated with such compounds. Articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds are also described.
    Type: Grant
    Filed: June 2, 1993
    Date of Patent: November 29, 1994
    Assignee: Transitions Optical, Inc.
    Inventor: David B. Knowles
  • Patent number: 5238981
    Abstract: Described are novel reversible photochromic naphthopyran compounds substituted at the number eight carbon atom on the naphtho portion of the naphthopyran ring with, for example, a methoxy group. Also described are organic host materials that contain or that are coated with such compounds. Articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds are also described.
    Type: Grant
    Filed: February 24, 1992
    Date of Patent: August 24, 1993
    Assignee: Transitions Optical, Inc.
    Inventor: David B. Knowles
  • Patent number: 4986934
    Abstract: Described are spirobenzoxazine pyrrolo pyridine compounds. Also described is the use of such compounds as photochromic substances in organic host materials such as an organic transparent plastic material, e.g., an ophthalmic lens, to impart a photochromic response thereto.
    Type: Grant
    Filed: December 21, 1988
    Date of Patent: January 22, 1991
    Assignee: PPG Industries, Inc.
    Inventors: Patricia L. Kwiatkowski, David B. Knowles