Patents by Inventor Alden D. West

Alden D. West 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).

  • Process for preparation of a photographic element
    Patent number: 5443948
    Abstract: An improved process for manufacturing a spectrally sensitized photographic element comprising the combination of ultrafiltration of silver halide grains in combination with a supersensitizing additive consisting of ##STR1## wherein D.sup.+ is Na.sup.+, K.sup.+, Li.sup.+, NH4.sup.+ ; n is 1-5; m is 1-10.
    Type: Grant
    Filed: March 21, 1994
    Date of Patent: August 22, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Mark D. Franke, Richard J. Legg, Alden D. West, Anna E. Doyle
  • Light sensitive element having an antihalation layer
    Patent number: 5164291
    Abstract: Sulfoalkyl substituted indolenine dyes that absorb infrared radiation and photosensitive elements containing said dyes are disclosed. These dyes are useful as antihalation dyes in infrared sensitive photographic elements which show dye low stain. These dyes are represented by the following structure: ##STR1## wherein X is F, Cl, or Br; R is a hydrocarbon moiety containing from two to about five carbon atoms; and Y is a cation. In a preferred embodiment X is Cl. In a more preferred embodiment R is --(CH.sub.2).sub.3 -- or --(CH.sub.2).sub.4 --.
    Type: Grant
    Filed: January 21, 1992
    Date of Patent: November 17, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Alden D. West, Dietrich M. Fabricius
  • Aqueous soluble infrared antihalation dyes
    Patent number: 5107063
    Abstract: Sulfoalkyl substituted indolenine dyes that absorb infrared radiation and photosensitive elements containing said dyes are disclosed. These dyes are useful as antihalation dyes in infrared sensitive photographic elements which show dye low stain. These dyes are represented by the following structure: ##STR1## wherein X is F, Cl, or Br; R is a hydrocarbon moiety containing from two to about five carbon atoms; and Y is a cation. In a preferred embodiment X is Cl. In a more preferred embodiment R is --(CH.sub.2).sub.3 -- or --(CH.sub.2).sub.4 --.
    Type: Grant
    Filed: October 31, 1990
    Date of Patent: April 21, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Alden D. West, Dietrich M. Fabricius
  • Infrared laser recording film
    Patent number: 4882265
    Abstract: A photographic element useful as a laser medical recording film, for example, is described. This element has near infrared sensitivity and is characterized by having an absorbing layer with an absorbing dye as described herein present as an antihalation backing layer.
    Type: Grant
    Filed: May 18, 1988
    Date of Patent: November 21, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Evan D. Laganis, Alden D. West