Patents by Inventor Thomas Schelhorn

Thomas Schelhorn 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).

  • Silver halide photographic element containing dyes for antihalation
    Patent number: 5536626
    Abstract: A novel dye and photographic element comprising the dye are detailed. The dye is especially useful as an antihalation dye in a photographic element. A particularly preferred embodiment is provided in a photographic element comprising an absorbing amount of the dye: ##STR1## wherein X1, X2 independently represents --CR.sup.8 R.sup.9 --, --S--, --Se--, --NR.sup.10 --, --CH.dbd.CH-- or --O--;R.sup.1 and R.sup.2 independently represent alkyl of 1 to 10 carbons or substituted alkyl of 1 to 10 carbons;R.sup.3 represents a ring chosen from the set consisting of aromatic ring of 6 or 10 carbons, substituted aromatic ring of 6 or 10 carbons, a heterocyclic ring and a substituted heterocyclic ring;R.sup.4, R.sup.5, R.sup.6 and R.sup.7 independently represent hydrogen, alkyl of 1-10 carbons, substituted alkyl of 1-10 carbons;R.sup.8, R.sup.9 independently represent alkyl of 1-10 carbons, substituted alkyl of 1-10 carbons, aromatic ring of 6 or 10 carbons, substituted aromatic ring of 6 or 10 carbons;R.sup.
    Type: Grant
    Filed: May 31, 1995
    Date of Patent: July 16, 1996
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Dietrich M. Fabricius, Thomas Schelhorn
  • Photographic element with ether dyes for near-infrared antihalation
    Patent number: 5519145
    Abstract: A novel dye and photographic element comprising the dye are detailed. The dye is especially useful as an antihalation dye in a photographic element. A particularly preferred embodiment is provided in a photographic element comprising an absorbing amount of the dye: ##STR1## wherein X.sup.1, X.sup.2 independently represents --CR.sup.8 R.sup.9 --, --S--, --Se--, --NR.sup.10 --, --CH.dbd.CH-- or --O--;R.sup.1 and R.sup.2 independently represent alkyl of 1 to 10 carbons or substituted alkyl of 1 to 10 carbons;R.sup.3 represents a ring chosen from the set consisting of aromatic ring of 6 or 10 carbons, substituted aromatic ring of 6 or 10 carbons, a heterocyclic ring and a substituted heterocyclic ring;R.sup.4, R.sup.5, R.sup.6 and R.sup.7 independently represent hydrogen, alkyl of 1-10 carbons, substituted alkyl of 1-10 carbons;R.sup.8, R.sup.9 independently represent alkyl of 1-10 carbons, substituted alkyl of 1-10 carbons, aromatic ring of 6 or 10 carbons, substituted aromatic ring of 6 or 10 carbons;R.sup.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: May 21, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Dietrich M. Fabricius, Thomas Schelhorn
  • Near-infrared absorbing dyes prepared from stenhouse salts
    Patent number: 5397690
    Abstract: An improved dye class and preparation procedure therefore is provided. The dyes can be prepared from a Stenhouse salt which is economical and can be prepared from readily available reagents. The improved dye is particularly suited for use as an antihalation dye in photographic elements and does not impart deleterious properties thereto. These and other properties are provided in a dye represented by: ##STR1## wherein the constituents have defined values.
    Type: Grant
    Filed: March 16, 1994
    Date of Patent: March 14, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Dietrich M. Fabricius, Thomas Schelhorn
  • Photographic element with near-infrared antihalation layer
    Patent number: 5330884
    Abstract: Disclosed is a photographic element comprising an antihalation dye of formula: ##STR1## wherein X.sup.1, X.sup.2 independently represents --CR.sup.8 R.sup.9 --, --S--, --Se--, --NR.sup.10 --, --CH.dbd.CH-- or --O--;n is an integer of 2 or 3;R.sup.1 and R.sup.2 independently represent alkyl of 1 to 10 carbons or substituted alkyl of 1 to 10 carbons;R.sup.3 represents a ring chosen from the set consisting of aryl, substituted aryl, and a heterocyclic ring;R.sup.4, R.sup.5, R.sup.6 and R.sup.7 independently represent hydrogen, alkyl of 1-10 carbons, substituted alkyl of 1-10 carbons, R.sup.4 and R.sup.5 taken together or R.sup.6 and R.sup.7 taken together may represent the atoms necessary to form a 5 or 6-membered aliphatic ring, an aromatic six-membered ring, an aromatic 10-membered ring, a substituted aromatic six-member ring or a substituted aromatic 10-member ring;R.sup.8, R.sup.
    Type: Grant
    Filed: May 26, 1993
    Date of Patent: July 19, 1994
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Dietrich M. Fabricius, Thomas Schelhorn
  • Photographic element with near-infrared antihalation layer
    Patent number: RE36174
    Abstract: Disclosed is a photographic element comprising an antihalation dye of formula: ##STR1## whereinX.sup.1 .?.,.!. .Iadd.and .Iaddend.X.sup.2 independently represent.?.s.!. --CR.sup.8 R.sup.9 --, --S--, --Se--, --NR.sup.10 --, --CH.dbd.CH-- or --O--;n is an integer of 2 or 3;R.sup.1 and R.sup.2 independently represent alkyl of 1 to 10 carbons or substituted alkyl of 1 to 10 carbons;R.sup.3 represents .?.a ring chosen from the set consisting of aryl, substituted aryl, and.!. a heterocyclic ring;R.sup.4, R.sup.5, R.sup.6 and R.sup.7 independently represent hydrogen, alkyl of 1-10 carbons, substituted alkyl of 1-10 carbons.?.,.!..Iadd.; or .Iaddend.R.sup.4 and R.sup.5 taken together or R.sup.6 and R.sup.7 taken together .?.may.!. represent the atoms necessary to form a 5 or 6-membered aliphatic ring, an aromatic six-membered ring, an aromatic 10-membered ring, a substituted aromatic .?.six-member.!. .Iadd.six-membered .Iaddend.ring or a substituted aromatic .?.10-member.!. .Iadd.10-membered .Iaddend.ring;R.sup.8 .?.
    Type: Grant
    Filed: May 1, 1997
    Date of Patent: March 30, 1999
    Assignee: Sterling Diagnostic Imaging, Inc.
    Inventors: Dietrich M. Fabricius, Thomas Schelhorn