Patents by Inventor William K. Smothers

William K. Smothers 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).

  • Visible dye photosensitizers derived from tropinone
    Patent number: 5484927
    Abstract: Visible light absorbing dyes derived from tropinone are disclosed.
    Type: Grant
    Filed: August 19, 1994
    Date of Patent: January 16, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: William K. Smothers
  • Photobleachable initiator systems
    Patent number: 5332819
    Abstract: This invention relates to photopolymerizable compositions containing initiator systems that absorb in the longer wavelength region of the visible spectrum. Photopolymerizable compositions containing selected photodissociable initiators in combination with photobleachable sensitizers are disclosed.
    Type: Grant
    Filed: March 19, 1993
    Date of Patent: July 26, 1994
    Assignee: E.I. Du Pont de Nemours and Company
    Inventor: William K. Smothers
  • Photopolymerizable compositions in elements for hologram imaging
    Patent number: 5260149
    Abstract: Solid photopolymerizable compositions and photosensitive elements are provided that are useful in preparing optical elements, and especially holograms. The composition contains a polymeric binder, a liquid ethylenically unsaturated monomer, and a photoinitiator system. Typical compositions have a refractive index modulation of at least 0.005 when measured per the specified test.
    Type: Grant
    Filed: October 16, 1991
    Date of Patent: November 9, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Bruce M. Monroe, William K. Smothers
  • Visible photosensitizers for photopolymerizable compositions
    Patent number: 5256520
    Abstract: Photopolymerizable compositions containing photoinitiator systems that absorb in the visible are disclosed. The photopolymerizable compositions contain at least one ethylenically unsaturated monomer capable of free radical initiated addition polymerization and a photoinitiator system capable of being activated by actinic radiation. The photoinitiator system comprises a hexaarylbisimidazole, a chain transfer agent, and a sensitizer given by the formulae A or B wherein X and R.sub.1 -R.sub.13 are as defined herein.
    Type: Grant
    Filed: November 10, 1992
    Date of Patent: October 26, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: William K. Smothers
  • Visible photosensitizers for photopolymerizable compositions
    Patent number: 5236808
    Abstract: Photopolymerizable compositions containing photoinitiator systems that absorb in the visible are disclosed. The photoinitiator system comprises a sensitizer which is a compound of the structure I: ##STR1## wherein R.sub.2 and R.sub.
    Type: Grant
    Filed: April 13, 1992
    Date of Patent: August 17, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: William K. Smothers
  • Photobleachable initiator systems
    Patent number: 5217846
    Abstract: This invention relates to photopolymerizable compositions containing initiator systems that absorb in the longer wavelength region of the visible spectrum. Photopolymerizable compositions containing selected photodissociable initiators in combination with photobleachable sensitizers are disclosed.
    Type: Grant
    Filed: June 11, 1991
    Date of Patent: June 8, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: William K. Smothers
  • Visible photosensitizers for photopolymerizable compositions
    Patent number: 5204467
    Abstract: Photopolymerizable compositions containing photoinitiator systems that absorb in the visible are disclosed.
    Type: Grant
    Filed: December 20, 1991
    Date of Patent: April 20, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: William K. Smothers
  • Red sensitive photopolymerizable compositions
    Patent number: 5147758
    Abstract: Photopolymerizable compositions which comprise a borate anion, a squarylium sensitizer, and, in the preferred case, a halomethyl triazine are disclosed.
    Type: Grant
    Filed: February 19, 1991
    Date of Patent: September 15, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: William K. Smothers, Gregory C. Weed, Evan D. Laganis, George Lalka
  • Photopolymerizable compositions and elements for refractive index imaging
    Patent number: 5098803
    Abstract: Solid photopolymerizable compositions and photosensitive elements are provided that are useful in preparing optical elements, and especially holograms. The compositions contains a polymeric binder, a liquid ethylenically unsaturated monomer, and a photoinitiator system. Typical compositions have a refractive index modulation of at least 0.005 when measured per the specified test.
    Type: Grant
    Filed: February 14, 1990
    Date of Patent: March 24, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Bruce M. Monroe, William K. Smothers
  • Dry film process for altering wavelength response of holograms
    Patent number: 5024909
    Abstract: Wavelength response of volume holograms is altered by contact with a dry film diffusion element.
    Type: Grant
    Filed: June 12, 1990
    Date of Patent: June 18, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: William K. Smothers, Krishna C. Doraiswamy, Mark L. Armstrong
  • Storage stable photopolymerizable composition and element for refractive index imaging
    Patent number: 4994347
    Abstract: Solid storage stable photopolymerizable compositions are provided that are useful in preparing optical elements, and especially holograms. The composition contains a polymeric binder, N-vinyl carbazole and a photoinitiator system that has a hydrogen donor component.
    Type: Grant
    Filed: December 23, 1988
    Date of Patent: February 19, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: William K. Smothers
  • Holographic notch filters
    Patent number: 4965152
    Abstract: Holographic notch filters are provided that comprise photopolymer films, having an optical density of at least 2, mounted on a transparent substrate.
    Type: Grant
    Filed: July 14, 1989
    Date of Patent: October 23, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Dalen E. Keys, William K. Smothers, Torence J. Trout
  • Dry film process for altering wavelength response of holograms
    Patent number: 4959283
    Abstract: Wavelength response of volume holograms is altered by contact with a dry film diffusion element.
    Type: Grant
    Filed: July 14, 1989
    Date of Patent: September 25, 1990
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: William K. Smothers, Krishna C. Doraiswamy, Mark L. Armstrong, Torence J. Trout
  • Holographic photopolymer compositions and elements containing a ring-opening monomer
    Patent number: 4959284
    Abstract: Presence of a ring opening monomer in a photopolymerizable composition improves reflection holograms prepared from the composition.
    Type: Grant
    Filed: December 29, 1988
    Date of Patent: September 25, 1990
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: William K. Smothers, Bruce M. Monroe, Dominic M. T. Chan
  • Holographic optical combiners for head-up displays
    Patent number: 4950567
    Abstract: Optical Combiners are provided for use in Head-Up Displays. The Combiners have a refractive index modulation greater than approximately 0.001.
    Type: Grant
    Filed: June 22, 1989
    Date of Patent: August 21, 1990
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Dalen E. Keys, William K. Smothers, Albert F. Harrington, Jacob Beutel, Scott R. Schicker, Dillon F. Scofield
  • Photopolymerizable compositions and elements for refractive index imaging
    Patent number: 4942112
    Abstract: Solid photopolymerizable compositions and photosensitive elements are provided that are useful in preparing optical elements, and especially holograms. The composition contains a polymeric binder, a liquid ethylenically unsaturated monomer, and a photoinitiator system. Typical compositions have a refractive index modulation of at least 0.005 when measured per the specified test.
    Type: Grant
    Filed: January 15, 1988
    Date of Patent: July 17, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Bruce M. Monroe, William K. Smothers
  • Holographic optical elements having a reflection hologram formed in a photopolymer
    Patent number: 4942102
    Abstract: Improved holographic optical elements are disclosed that contain a reflection hologram. Also, an improved process for forming reflection hologram.
    Type: Grant
    Filed: June 22, 1989
    Date of Patent: July 17, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Dalen E. Keys, William K. Smothers, Albert F. Harrington, Jacob Beutel, Scott R. Schicker, Dillion F. Scofield
  • Visible sensitizers for photopolymerizable compositions
    Patent number: 4917977
    Abstract: A photosensitive composition comprising:(a) a compound of the formula ##STR1## (b) an ethylenically unsaturated compound capable of free radical initiated addition polymerization;(c) a polymeric binder; and(d) a free radical generating system activatable by actinic radiation which comprises a hexaarylbiimidazole and a chain transfer agent.A single step process for forming a light-stable hologram using this photosensitive composition is also disclosed.
    Type: Grant
    Filed: December 23, 1988
    Date of Patent: April 17, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: William K. Smothers