Patents Represented by Attorney, Agent or Law Firm Paul A. Leipold
  • Imaging element with a substrate containing low molecular weight hindered amine stabilizer
    Patent number: 5998119
    Abstract: The invention relates to an imaging element comprising a paper substrate and a layer adjacent said paper comprising polyolefin polymer and a hindered amine stabilizer wherein said hindered amine stabilizer has a number average molecular weight of less than 2300.
    Type: Grant
    Filed: August 27, 1998
    Date of Patent: December 7, 1999
    Assignee: Eastman Kodak Company
    Inventors: Peter T. Aylward, Valerie J. Harris
  • Process for buffering concentrated aqueous slurries
    Patent number: 5994041
    Abstract: An aqueous-based slurry comprising:a particulate solid substance comprising a weak acid functional group having effective pK.sub.a1 >1 and less than 1% by weight aqueous solubility at pH=pK.sub.a1 ;an aqueous continuous phase at pH<pK.sub.a1 +3;a buffering salt of a weak acid, where the weak acid associated with this buffering salt has pK.sub.a2 and wherepK.sub.a1 -2.ltoreq.pK.sub.a2 ;andwhere the incremental molar ionic strength in the continuous phase of said slurry resulting from said buffering salt is less than 0.04 mol/L is disclosed.
    Type: Grant
    Filed: February 6, 1998
    Date of Patent: November 30, 1999
    Assignee: Eastman Kodak Company
    Inventors: John Texter, Ravi Sharma, David Alan Czekai
  • Method for use of light colored undeveloped photographic element
    Patent number: 5994050
    Abstract: The invention relates to a method of improved burning and dodging comprising providing a color photographic element that prior to development has CIELAB coordinates such that L* is greater than 71, exposing said paper, wherein during exposure burning and dodging is carried out.
    Type: Grant
    Filed: October 3, 1997
    Date of Patent: November 30, 1999
    Assignee: Eastman Kodak Company
    Inventors: Roupen H. Maronian, Donald R. Diehl, Pamela M. Ferguson, Joseph E. LaBarca
  • Composite photographic material with laminated biaxially oriented polyolefin sheets with controlled water vapor transmission rate
    Patent number: 5994045
    Abstract: This invention is generally accomplished by a photographic or imaging element comprising a paper base, at least one photosensitive silver halide layer, a tie layer and a biaxiaily oriented polyolefin sheet wherein said polyolefin sheet by itself or in combination with said tie layer has a water vapor transmission rate of less than 0.85.times.10.sup.-5 g/mm.sup.2 /day.
    Type: Grant
    Filed: December 24, 1997
    Date of Patent: November 30, 1999
    Assignee: Eastman Kodak Company
    Inventors: Robert P. Bourdelais, Douglas N. Haydock, Thaddeus S. Gula, Peter T. Aylward
  • Performance of photographic emulsions at high silver ion concentrations
    Patent number: 5989795
    Abstract: This invention relates to a photographic recording material comprising a support and a photosensitive chemically sensitized silver halide emulsion layer, containing a sensitizing dye selected from the group consisting of oxonal dyes, merocyanine dyes, and cyanine dyes having a net negative charge, and which has a pH value between about 2 to about 5 and a pAg value between about 1 to about 4.7.
    Type: Grant
    Filed: May 21, 1992
    Date of Patent: November 23, 1999
    Assignee: Eastman Kodak Company
    Inventors: Francis John Evans, Arthur Herman Herz
  • High rake knives for color paper slitting
    Patent number: 5974922
    Abstract: The invention relates to a method of slitting photographic print material comprising providing at least one rotary anvil shearing device and at least one rotary knife shearing device wherein said at least one rotary knife has a rake angle of between about 50 and 70 degrees, and passing photographic material between said anvil and said knife to cut said material.
    Type: Grant
    Filed: April 22, 1998
    Date of Patent: November 2, 1999
    Assignee: Eastman Kodak Company
    Inventors: Alphonse D. Camp, John J. Seyna, Keith W. Dorricott, Robert E. Deutsch
  • Thickener for delivery of photographic emulsions
    Patent number: 5972591
    Abstract: The invention is generally accomplished by providing a photographic element and a process of its formation wherein a gelatin silver halide emulsion is provided with a thickener comprising a copolymer of the structure whereinA comprises about 10 to about 20 parts by weight of said copolymer, andB comprises about 80 to about 90 parts by weight of said copolymer.It is particularly preferred that the copolymer be provided in a hardener layer to minimize the amount of gelatin needed and thus reduce the reaction of hardener with gelatin. The invention finds a preferred use in curtain coating wherein there is a greater need for high viscosity materials, particularly at the bottom of a group of layers in order to minimize distortions of the layers as they are applied in the curtain coating process.
    Type: Grant
    Filed: December 30, 1993
    Date of Patent: October 26, 1999
    Assignee: Eastman Kodak Company
    Inventors: Marianne Yarmey, Wayne Arthur Bowman, Stephen Joseph Kozak, Gary Francis Mitchell, Glenn Thomas Pearce, Melvin David Sterman
  • Roughness elimination by control of strength of polymer sheet in relation to base paper
    Patent number: 5968695
    Abstract: The invention relates to a photographic element comprising a paper base, at least one photosensitive silver halide layer, a biaxially oriented polymer sheet between said paper base and said silver halide layer, wherein said polymer sheet has a thickness of between 13 microns and 65 microns and a Young's modulus of between 700 and 5200 MPa wherein said base paper has a Young's modulus between 1380 MPa and 13800 MPa, a thickness between 75 microns and 200 microns, and an average roughness on the emulsion side of between 0.18 and 0.68 microns and wherein the ratio of thickness between said polymer sheet and said base paper is between 0.1 and 0.5.
    Type: Grant
    Filed: December 11, 1998
    Date of Patent: October 19, 1999
    Assignee: Eastman Kodak Company
    Inventors: Thaddeus S. Gula, Peter T. Aylward, Robert P. Bourdelais, Douglas N. Haydock
  • Biaxially oriented sheet photographic film for better photofinishing
    Patent number: 5968722
    Abstract: The invention relates to a imaging element comprising a laminated base structure wherein said base structure comprises a paper having laminated to the upper side and upper biaxially oriented polyolefin sheet and laminated to the lower side of said paper a lower side biaxially oriented polymer sheet wherein said lower side biaxially oriented polymer sheet has an energy to break of less than 3.5.times.10.sup.7 J/m.sup.3 in at least one direction.
    Type: Grant
    Filed: June 19, 1998
    Date of Patent: October 19, 1999
    Assignee: Eastman Kodak Company
    Inventors: Pang-Chia Lu, Robert P. Bourdelais, Thaddeus S. Gula
  • Color paper with improved wet abrasion sensitivity
    Patent number: 5962210
    Abstract: The invention relates to a photographic emulsion comprising silver iodochloride grains, said grains further comprising iridium, said grains chemically sensitized with gold in an amount of between 120 and 200 mg gold per silver mole and sulfur in an amount between 0.1 and 20 mg sulfur per silver mole, 1-(3-acetamidophenyl)-5-mercaptotetrazole, 1-phenyl-5-mercaptotetrazole, and a disulfide compound represented by the following formula: ##STR1## wherein X is independently --O--, --NH-- or --NR--, where R is a substituent;m and r are independently 0, 1 or 2;X is --H or a cationic species;Ar is an aromatic group; andL is a linking group, where p is 0 or 1.
    Type: Grant
    Filed: January 12, 1998
    Date of Patent: October 5, 1999
    Assignee: Eastman Kodak Company
    Inventors: Paul T. Hahm, Alberto M. Martinez, Melvin M. Kestner, Eric L. Bell, Walter H. Isaac
  • Photographic image improvement in spectral sensitizing dye and filter dye having similar spectral absorption characteristics
    Patent number: 5962211
    Abstract: The invention relates to a photographic element comprising at least one absorber dye and at least one sensitizing dye wherein the peak sensitivity of said absorber dye and said sensitizing dye are similar. This provides improved perceptual red detail in regions of high red density in the negative image.
    Type: Grant
    Filed: October 3, 1997
    Date of Patent: October 5, 1999
    Assignee: Eastman Kodak Company
    Inventors: Roupen H. Maronian, Donald R. Diehl, Pamela M. Ferguson
  • Photographic element with top blue light sensitive layer
    Patent number: 5958661
    Abstract: The invention relates to a color photographic element comprising a red light sensitive layer comprising a cyan dye forming coupler, a green light sensitive layer comprising a magenta dye forming coupler, a blue light sensitive layer comprising a yellow dye forming coupler, wherein said magenta dye forming coupler comprises ##STR1## wherein R.sub.a and R.sub.b independently represent H or a substituent; X is hydrogen or a coupling-off group; and Z.sub.a, Z.sub.b, and Z.sub.c are independently a substituted methine group, .dbd.N--, .dbd.C--, or --NH--, provided that one of either the Z.sub.a --Z.sub.b bond or the Z.sub.b --Z.sub.c bond is a double bond and the other is a single bond, and when the Z.sub.b --Z.sub.c bond is a carbon--carbon double bond, it may form part of an aromatic ring, and at least one of Z.sub.a, Z.sub.b, and Z.sub.c represents a methine group connected to the group R.sub.
    Type: Grant
    Filed: July 15, 1997
    Date of Patent: September 28, 1999
    Assignee: Eastman Kodak Company
    Inventors: John B. Rieger, Alphonse D. Camp, Michael R. Roberts, Thomas A. Chuhta
  • Strippable biaxially oriented base for imaging element
    Patent number: 5955239
    Abstract: The invention relates to a photographic element comprising a paper base, at least one photosensitive silver halide layer, a layer of biaxially oriented polyolefin sheet between said paper base and said silver halide layer, wherein there is located between said biaxially oriented polyolefin sheet and said base paper a layer of strippable material comprising a material that has a peel strength of between about 30 and 150 g/5 cm.
    Type: Grant
    Filed: December 24, 1997
    Date of Patent: September 21, 1999
    Assignee: Eastman Kodak Company
    Inventors: Douglas N. Haydock, Thaddeus S. Gula, Peter T. Aylward, Robert P. Bourdelais
  • Enhanced sensitivity from thiolone dioxides in cubic silver chloride emulsions with sharp corners
    Patent number: 5952166
    Abstract: The invention relates to an emulsion comprising sharp cornered silver chloride grains, said grains having a rounding index less than 0.3 and dithiolone dioxide.
    Type: Grant
    Filed: January 26, 1998
    Date of Patent: September 14, 1999
    Assignee: Eastman Kodak Company
    Inventors: Roger Lok, Jerzy Z. Mydlarz
  • Photographic element with color enhancing layer adjacent the yellow dye forming layer
    Patent number: 5948601
    Abstract: The invention relates to a photographic element comprising an emulsion layer comprising a cyan dye forming coupler, an emulsion layer comprising a magenta dye forming coupler, an emulsion layer comprising a yellow dye forming coupler wherein said magenta coupler comprises ##STR1## wherein R.sub.a and R.sub.b independently represent H or a substituent; X is hydrogen or a coupling-off group; and Z.sub.a, Z.sub.b, and Z.sub.c are independently a substituted methine group, .dbd.N--, .dbd.C--, or --NH--, provided that one of either the Z.sub.a --Z.sub.b bond or the Z.sub.b --Z.sub.c bond is a double bond and the other is a single bond, and when the Z.sub.4 --Z.sub.c bond is a carbon-carbon double bond, it may form part of an aromatic ring, and at least one of Z.sub.a, Z.sub.b, and Z.sub.c represents a methine group connected to the group R.sub.
    Type: Grant
    Filed: January 31, 1997
    Date of Patent: September 7, 1999
    Assignee: Eastman Kodak Company
    Inventor: John B. Rieger
  • Sheets having a microvoided layer of strength sufficient to prevent bend cracking in an imaging member
    Patent number: 5935690
    Abstract: The invention relates to a photographic element comprising a paper base with a thickness from 0.025 mm to 0.25 mm, at least one photosensitive silver halide layer, and a layer of microvoided and biaxially oriented polyolefin sheet having a layer thickness of 0.020 mm to 0.050 mm, a density of between 78% and 100% of the solid polymer density located between said paper base and said at least one photosensitive silver halide layer, and wherein the entire photographic element is substantially free from surface distortion or cracking when the photographic element is forced to the shape of a diameter of no less than 8.0 mm.
    Type: Grant
    Filed: May 23, 1997
    Date of Patent: August 10, 1999
    Assignee: Eastman Kodak Company
    Inventors: Peter T. Aylward, Robert P. Bourdelais, Douglas N. Haydock, Thaddeus S. Gula
  • Ink compositions containing surfactant sols comprising mixtures of solid surfactants
    Patent number: 5916358
    Abstract: The invention is related to an aqueous ink composition comprising water, a coloring agent, and solid surfactant particles wherein said solid particles comprise a mixture of at least two surfactants with very low water solubility and with melting points between 40.degree. C. and 90.degree. C.
    Type: Grant
    Filed: December 30, 1996
    Date of Patent: June 29, 1999
    Assignee: Eastman Kodak Company
    Inventors: Pranab Bagchi, Ravi Sharma, Constance N. Anagnostopoulos, Gilbert A. Hawkins, John A. Lebens, Thierry Vachette, James M. Chwalek, David S. Ross
  • Photographic element that resists curl using oriented sheets
    Patent number: 5902720
    Abstract: The invention relates to a photographic element comprising a paper base, at least one photosensitive silver halide layer, a layer of biaxially oriented polymer sheet between said paper base and said silver halide layer, and a biaxially oriented polymer sheet on the opposite side of said base paper from said photosensitive silver halide layer wherein said biaxially oriented sheets and said base paper together have balanced forces such that the photographic element remains flat over a broad range of relative humidity changes.
    Type: Grant
    Filed: May 23, 1997
    Date of Patent: May 11, 1999
    Assignee: Eastman Kodak Company
    Inventors: Douglas N. Haydock, Thaddeus S. Gula, Peter T. Aylward, Robert P. Bourdelais
  • Controlling bending stiffness in photographic paper
    Patent number: 5888643
    Abstract: The invention relates to a method of providing a photographic imaging element having a bending stiffness between 150 and 250 millinewtons and a caliper thickness between about 0.18 mm and about 0.28 mm, comprising providing a laminated base sheet comprising a paper sheet having a Young's modulus of between about 13800 MPa to 2760 MPa in the machine direction and a Young's modulus of 6900 MPa to 1380 MPa in the cross direction, and having a biaxially oriented sheet on each side of said paper sheet having a Young's modulus of 690 MPa to 5520 MPa in the machine direction and a Young's modulus of 690 MPa to 5520 MPa in the cross machine direction and coating said laminated base sheet with photosensitive layers.
    Type: Grant
    Filed: May 23, 1997
    Date of Patent: March 30, 1999
    Assignee: Eastman Kodak Company
    Inventors: Peter T. Aylward, Robert P. Bourdelais, Douglas N. Haydock, Thaddeus S. Gula
  • Photographic element with microvoided sheet of opalescent appearance
    Patent number: 5888681
    Abstract: The invention relates to a photographic element comprising a paper base, at least one photosensitive silver halide layer, a layer of microvoided polymer sheet between said paper base and said silver halide layer, wherein said microvoided polymer sheet comprises a series of microvoids separated by polymer matrix in the vertical direction such that said microvoided polymer sheet when reflecting light has an opalescent appearance.
    Type: Grant
    Filed: May 23, 1997
    Date of Patent: March 30, 1999
    Assignee: Eastman Kodak Company
    Inventors: Thaddeus S. Gula, Peter T. Aylward, Robert P. Bourdelais, Douglas N. Haydock