Patents by Inventor Richard P. Szajewski

Richard P. Szajewski 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: 5451491
    Abstract: A method of desilvering an imagewise and developed color silver halide element, said method comprising bleaching the photographic element with a peracid bleach and subsequently contacting the photographic element with a fixer solution comprising thiosulfate anion and sodium cation;wherein the Molar-minute fixing Time is less than about 0.2 Molar-minutes.times.m.sup.2 /g Ag.times.the grams of incorporated silver per square meter of the photographic element.
    Type: Grant
    Filed: February 22, 1994
    Date of Patent: September 19, 1995
    Assignee: Eastman Kodak Company
    Inventors: Richard P. Szajewski, John M. Buchanan
  • Patent number: 5443943
    Abstract: Unique imagewise exposed and developed originating color silver halide photographic elements can be processed with bleaching and/or fixing solutions. The element is characterized by several important features. It contains a silver halide grain population of at least 50 mole percent chloride, based on total silver forming the grain population projected area, wherein at least 50 percent of total grain projected area is accounted for by intrinsically stable tabular grains (1) bounded by {100} major faces having adjacent edge ratios of less than 10, and (2) an aspect ratio of at least 2. Also, at least 50 mole % of the element silver halide is silver chloride, and no more than 2 mole % silver iodide. It also contains a bleach accelerator releasing compound. The element is also free of a desilvering rate retarding amount of a development inhibitor releasing compound having a free sulfur valence which binds to silver.
    Type: Grant
    Filed: March 22, 1993
    Date of Patent: August 22, 1995
    Assignee: Eastman Kodak Company
    Inventors: Richard P. Szajewski, John M. Buchanan
  • Patent number: 5434038
    Abstract: An improved image display material comprising a light sensitive tabular grain silver chloride emulsion spectrally sensitized to a peak wavelength of less than about 475 nm, and a method of use comprising the step of optically printing a color image onto the improved color photographic display material is provided. The material and method enable reduced printing times, improved color reproduction and lowered image granularity.
    Type: Grant
    Filed: March 31, 1994
    Date of Patent: July 18, 1995
    Assignee: Eastman Kodak Company
    Inventors: Anne E. Bohan, Jerzy A. Budz, Pamela M. Ferguson, Alberto M. Martinez, James P. Merrill, Scott F. O'Dell, Richard P. Szajewski
  • Patent number: 5399469
    Abstract: This invention relates to color photographic elements and processes and especially to color photographic elements comprising two or more image forming layers sensitized to the same region of the electromagnetic spectrum where a more sensitive layer is positioned closer to an exposure source than a less sensitive layer and the less sensitive layer additionally comprises a spatially fixed absorber dye. The combination provides improved image sharpness without compromising photographic sensitivity.
    Type: Grant
    Filed: October 13, 1993
    Date of Patent: March 21, 1995
    Assignee: Eastman Kodak Company
    Inventor: Richard P. Szajewski
  • Patent number: 5395744
    Abstract: The invention relates to a color negative photographic recording material comprising a support bearing:at least one photographic layer comprising a sensitized tabular grain silver halide emulsion having an average aspect ratio greater than about 8;an image dye forming coupler;at least one color dye forming development inhibitor releasing coupler; andat least one distributed dye that absorbs light in the region of the spectrum to which said sensitized tabular grain silver halide emulsion having an aspect ratio greater than about 8 is sensitized wherein;the quantity of said at least one distributed dye is such as to reduce the sensitivity of the color record containing said sensitized tabular grain silver halide emulsion having an aspect ratio greater than about 8 by at least 20%; andthe quantity of said at least one development inhibitor releasing compound being greater than about 0.07 mole percent relative to the total quantity of sensitized silver halide emulsion in said at least one photographic layer.
    Type: Grant
    Filed: October 13, 1993
    Date of Patent: March 7, 1995
    Assignee: Eastman Kodak Company
    Inventors: Allan F. Sowinski, Richard P. Szajewski, James P. Merrill
  • Patent number: 5385815
    Abstract: A photographic element comprising a UV absorbing polymer latex which is loaded with a non-polymeric UV absorbing compound. The polymer is a homopolymer or heteropolymer comprising monomeric units containing a 2-hydroxybenzotriazole. The benzotriazole preferably is of the formula I: ##STR1## wherein: the phenyl ring and benzo ring are optionally additionally substituted; and one of m and n is 1, and M and N have the formula: ##STR2## wherein R3 is H or an alkyl group; L is a bivalent linking group; and p is 0 or 1. The elements may additionally have a polmer present (which is preferably different from the UV absorbing polymer) which has a glass transition temperature (T.sub.g) of less than 5.degree. C.
    Type: Grant
    Filed: December 29, 1993
    Date of Patent: January 31, 1995
    Assignee: Eastman Kodak Company
    Inventors: Edward Schofield, Richard P. Szajewski
  • Patent number: 5356764
    Abstract: A color photographic element having a support bearing at least one radiation sensitive emulsion layer comprising dispersing medium and silver halide grains is disclosed. The emulsion layer is a tabular grain silver halide emulsion layer Wherein at least 50 percent of total grain projected area is accounted for by tabular grains (a) bounded by {100} major faces having adjacent edge ratios of less than 10, (b) each having an aspect ratio of at least 2, and (c) internally at their nucleation site, containing iodide and at least 50 mole percent chloride. The emulsion layer has in reactive association an image dye-forming compound and a compound that contains a photographically useful group and is capable of reacting with oxidized developing agent to thereby release such group. A process for preparing the radiation sensitive tabular grain silver halide emulsions is also described.
    Type: Grant
    Filed: June 1, 1993
    Date of Patent: October 18, 1994
    Assignee: Eastman Kodak Company
    Inventors: Richard P. Szajewski, Gary L. House, Thomas B. Brust, Debra L. Hartsell, Donald L. Black, Anne E. Bohan, James P. Merrill
  • Patent number: 5318880
    Abstract: This invention provides a method of processing a negative color silver halide photographic element comprising taking an exposed color silver halide photographic element with a speed greater than ISO 180 or containing at least one spectrally sensitized silver halide emulsion with a tabularity greater than 100, wherein the photographic element comprises a total amount of incorporated silver and incorporated vehicle of 20 g/m.sup.2 film or less; developing the exposed photographic material; and bleaching the exposed, developed photographic element with a peracid bleach in the presence of a bleach accelerator.
    Type: Grant
    Filed: June 1, 1992
    Date of Patent: June 7, 1994
    Assignee: Eastman Kodak Company
    Inventors: Daniel R. English, Richard P. Szajewski
  • Patent number: 5310635
    Abstract: A photographic camera film comprised of at least one radiation sensitive silver halide emulsion layer unit and a film base in a roll satisfying the formula ##EQU1## in which FBT is the thickness of the film base in micrometers (.mu.m).L is the diameter in .mu.m of the film roll;SD is the spool diameter in .mu.m of the film roll; andTU is the number of film turns in the film roll; wherein at least one emulsion layer unit is comprised of a radiation sensitive emulsion is disclosed containing a silver halide grain population comprised of at least 50 mole percent chloride, based on silver, wherein at least 50 percent of the grain population projected area is accounted for by tabular grains bounded by {100} major faces having adjacent edge ratios of less than 10 and each having an aspect ratio of at least 2.
    Type: Grant
    Filed: March 22, 1993
    Date of Patent: May 10, 1994
    Assignee: Eastman Kodak Company
    Inventor: Richard P. Szajewski
  • Patent number: 5310639
    Abstract: A light sensitive photographic element is disclosed having a support bearing at least one light sensitive silver halide emulsion layer and at least one non-light sensitive stress absorbing layer between the emulsion layer and the support, wherein the stress absorbing layer comprises a polymer and a hydrophilic colloid in a mass ratio of greater than or equal to about 1:2, the polymer having a glass transition temperature of less than about 5.degree. C. It has been found that pressure fog can be substantially reduced while maintaining scratch resistence when such a stress absorbing layer is present.
    Type: Grant
    Filed: February 23, 1993
    Date of Patent: May 10, 1994
    Assignee: Eastman Kodak Company
    Inventors: Kenneth J. Lushington, Richard P. Szajewski, Kevin M. O'Connor
  • Patent number: 5308747
    Abstract: A photographic recording material comprising a support bearing at least one photographic layer comprising a sensitized high aspect ratio tabular grain silver halide emulsion and at least one spatially fixed dye layer spatially positioned between said silver halide layer and the upper surface of said recording material, said dye layer comprises a spatially fixed dye that absorbs light in the region of the spectrum to which the silver halide is sensitized.
    Type: Grant
    Filed: April 16, 1992
    Date of Patent: May 3, 1994
    Assignee: Eastman Kodak Company
    Inventors: Richard P. Szajewski, James P. Merrill, Allan F. Sowinski
  • Patent number: 5302499
    Abstract: A color photographic recording material is disclosed which contains tabular silver halide emulsion grains of specified dimensions in at least two color records to enable improved speed and sharpness.
    Type: Grant
    Filed: April 16, 1992
    Date of Patent: April 12, 1994
    Assignee: Eastman Kodak Company
    Inventors: James P. Merrill, Lois A. Buitano, Allan F. Sowinski, Richard P. Szajewski
  • Patent number: 5300417
    Abstract: A light sensitive photographic element is disclosed having a support bearing at least one light sensitive silver halide emulsion layer, an overcoat layer, and at least one non-light sensitive stress absorbing layer between the emulsion layer and the overcoat layer, wherein the stress absorbing layer comprises a polymer and a hydrophilic colloid in a mass ratio of greater than or equal to about 1:1, the polymer having a glass transition temperature of less than about 5.degree. C. It has been found that pressure fog can be substantially reduced when such a stress absorbing layer is present.
    Type: Grant
    Filed: December 10, 1992
    Date of Patent: April 5, 1994
    Assignee: Eastman Kodak Company
    Inventors: Kenneth J. Lushington, Richard P. Szajewski, Kevin M. O'Connor
  • Patent number: 5298376
    Abstract: This invention provides a color silver halide photographic element having improved color saturation and a method of developing the photographic element. The photographic element comprises at least a first and a second silver halide emulsion layer each sensitized to a different region of the spectrum with at least one of the emulsion layers being in reactive association with a DIR compound which can release an anionic development inhibitor. The photographic element further contains a barrier layer containing an anionic latex polymer such that the barrier layer is positioned further from the support than the first and second silver halide emulsion layers.
    Type: Grant
    Filed: October 1, 1991
    Date of Patent: March 29, 1994
    Assignee: Eastman Kodak Company
    Inventors: Richard P. Szajewski, Allan F. Sowinski
  • Patent number: 5288594
    Abstract: A combination of a development inhibitor releasing coupler having a particular releasable mercaptotetrazole group; a concentration within the range of 2.5 to 25 mg/m.sup.2, that does not accelerate bleaching of the element upon exposure and processing, of a dye-forming naphtholic or acetanilide coupler comprising a coupling-off group represented by the formula ##STR1## as described in the specification, with a particular alkoxy-benzoyl yellow dye-forming coupler also as described in the specification in a photographic silver halide element and process enables improved dye images upon exposure and processing.
    Type: Grant
    Filed: March 26, 1993
    Date of Patent: February 22, 1994
    Assignee: Eastman Kodak Company
    Inventors: Joseph W. Manthey, David M. Niklewicz, Richard P. Szajewski
  • Patent number: 5275929
    Abstract: A photographic recording material is disclosed which contains tabular silver halide emulsion grains of specified dimensions to enable improved sharpness.
    Type: Grant
    Filed: April 16, 1992
    Date of Patent: January 4, 1994
    Assignee: Eastman Kodak Company
    Inventors: Lois A. Buitano, Allan F. Sowinski, James P. Merrill, Richard P. Szajewski
  • Patent number: 5256523
    Abstract: A compound (I) having a carrier moiety (CAR) and a releasable development inhibitor moiety (INH) capable of being released during photographic processing by means of at least one timing group (T) bonded to and releasable from the carrier moiety provides improved images in a photographic silver halide element and process when the inhibitor moiety (INH) comprises (R.sup.1) a non-aromatic, sterically hindered substituent group having (a) a tertiary carbon atom bonded directly to the releasable development inhibitor moiety or (b) a secondary carbon atom bonded directly to the releasable development inhibitor moiety and wherein the secondary carbon atom is not part of an unsubstituted carbocyclic ring containing at least 6 carbon atoms. Such compounds, particularly as couplers, are useful in photographic silver halide materials and processes to provide improved acutance and interimage effects.
    Type: Grant
    Filed: June 17, 1991
    Date of Patent: October 26, 1993
    Assignee: Eastman Kodak Company
    Inventors: Richard P. Szajewski, Jerrold N. Poslusny
  • Patent number: 5250399
    Abstract: A photographic coupler (A) capable, upon oxidative coupling, of forming a dye that can be washed out of a photographic element containing the coupler upon processing, comprises, in the coupling position, a coupling-off group that comprises, in sequence, a releasable ballasted carbamate timing group and a releasable benzotriazole, triazole or tetrazole development inhibitor group. Such a coupler is useful in photographic silver halide materials and processes to provide improved images.
    Type: Grant
    Filed: June 28, 1991
    Date of Patent: October 5, 1993
    Assignee: Eastman Kodak Company
    Inventors: Richard P. Szajewski, Jerrold N. Poslusny, David A. Steele, Teh-hsuan Chen, Paul A. Burns, Ronald E. Leone, William J. Begley
  • Patent number: 5221600
    Abstract: Certain development inhibitor releasing compounds when incorporated in a photographic element at low levels provide development acceleration. The compounds release silver halide binding groups that are substituted with a group containing an ether oxygen atom and/or an imino nitrogen atom. They are especially useful in high speed color photographic materials.
    Type: Grant
    Filed: December 13, 1990
    Date of Patent: June 22, 1993
    Assignee: Eastman Kodak Company
    Inventors: Richard P. Szajewski, Jerrold N. Poslusny
  • Patent number: 5135839
    Abstract: A photographic silver halide element comprises a combination of a first coupler that is capable of releasing a development inhibitor moiety during photographic processing that enhances development inhibition and a second coupler that enables release of a bleach accelerator group upon processing. The photographic silver halide element is useful in photographic imaging.
    Type: Grant
    Filed: November 13, 1990
    Date of Patent: August 4, 1992
    Assignee: Eastman Kodak Company
    Inventor: Richard P. Szajewski