Patents by Inventor William D. Ramsden
William D. Ramsden 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).
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Publication number: 20030162134Abstract: A photothermographic material that comprises a support having thereon one or more thermally-developable imaging layers comprising a binder and in reactive association, a photosensitive silver halide, a non-photosensitive source of reducible silver ions, and a reducing composition for the non-photosensitive source reducible silver ions. The thermally-developable layers further comprises one or more radiation absorbing compounds that provide a total absorbance of greater than 0.6 and up to and including 3 in the thermally-developable imaging layer(s). These photothermographic materials exhibit reduced mottle without significant loss in sensitivity.Type: ApplicationFiled: December 5, 2001Publication date: August 28, 2003Applicant: Eastman Kodak CompanyInventors: Bryan V. Hunt, Steven H. Kong, William D. Ramsden, Gary E. Labelle
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Patent number: 6605416Abstract: Photochemical acid progenitors in combination with dihydroperimidine squarylium dyes have been found to be particularly effective at generating acid upon irradiation with near-infrared radiation. It has been found that dihydroperimidine squarylium dyes that are particularly useful in this invention have an oxidation potential greater than about 0.5 V relative to SCE as measured in dichloromethane.Type: GrantFiled: February 2, 1998Date of Patent: August 12, 2003Assignee: Imation Corp.Inventors: Stanley C. Busman, Richard J. Ellis, Jeanne E. Haubrich, William D. Ramsden, Tran Van Thien, Gregory D. Cuny
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Patent number: 6605418Abstract: Thermally developable compositions such thermographic and photothermographic emulsions include certain quaternary phthalazine compounds. These emulsions can be used in thermally developable materials such as thermographic and photothermographic materials to provide improved sensitometric and post processing properties. Such materials can have imaging layers on one or both sides of the support.Type: GrantFiled: October 28, 2002Date of Patent: August 12, 2003Assignee: Eastman Kodak CompanyInventors: William D. Ramsden, Chaofeng Zou
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Publication number: 20030138738Abstract: A photothermographic material that comprises a support having thereon one or more thermally-developable imaging layers comprising a binder and in reactive association, a photosensitive silver halide, a non-photosensitive source of reducible silver ions, and a reducing composition for the non-photosensitive source reducible silver ions. The thermally-developable layers further comprises one or more radiation absorbing compounds that provide a total absorbance of greater than 0.6 and up to and including 3 in the thermally-developable imaging layer(s). These photothermographic materials are independently coated and dried while the material is conveyed at a rate of at least meters per minute.Type: ApplicationFiled: December 5, 2001Publication date: July 24, 2003Applicant: Eastman Kodak CompanyInventors: Bryan V. Hunt, Steven H. Kong, William D. Ramsden, Gary E. Labelle
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Patent number: 6582892Abstract: A black-and-white photothermographic material that is sensitive at a wavelength greater than 700 nm, and comprises a support having thereon one or more thermally-developable imaging layers comprising a binder and in reactive association, a photosensitive silver halide, a non-photosensitive source of reducible silver ions, and a reducing composition for the non-photosensitive source reducible silver ions. The thermally-developable layers further comprises one or more indolenine dyes as post-processing stabilizing compounds and one or more merocyanine dyes or cyanine spectral sensitizing dyes that comprise one or more thioalkyl, thioaryl, or thioether groups.Type: GrantFiled: June 29, 2001Date of Patent: June 24, 2003Assignee: Eastman Kodak CompanyInventors: Steven H. Kong, Bryan V. Hunt, William D. Ramsden
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Patent number: 6558880Abstract: Photothermographic materials comprise heat-bleachable antihalation compositions in backside antihalation layers. These compositions comprise a hexaarybiimidazole and an oxonol dye that can be represented by the following Structure I: A1═L1—(L2═L3)p—(L4═L5)q—(L6═L7)r—A2−(M)k wherein A1 and A2 are the same or different activated methylene moieties, L1 through L7 independently represent a substituted or unsubstituted methine group, M represents a counterion, k is the number of M counterions necessary to provide neutral charge for Structure I, p, and q, are independently 0 or 1, and r is 0, 1, or 2. The antihalation composition is typically bleached when subjected to a temperature of at least 90° C. for at least 0.5 seconds.Type: GrantFiled: June 6, 2001Date of Patent: May 6, 2003Assignee: Eastman Kodak CompanyInventors: Ramanuj Goswami, William D. Ramsden, Paul A. Zielinski, David G. Baird, LuAnn K. Weinstein, Margaret J. Helber, Doreen C. Lynch
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Patent number: 6514677Abstract: Photothermographic materials comprise heat-bleachable antihalation compositions in antihalation layers. These compositions comprise a hexaarybiimidazole and one or more infrared radiation absorbing compounds that are represented by the following Structure I: A1—L1—A2 I wherein A1 represents a group derived from a dye base, a heterocyclic group, or an electron-donating aromatic group, A2 represents a group derived from a dye base, a heterocyclic group, a group derived from a dye acid, or an electron-donating aromatic group, and L1 represents a conjugated linking group that maintains electron delocalization between A1 and A2 to provide infrared absorbance. The antihalation composition is typically bleached when subjected to a temperature of at least 90° C. for at least 0.5 seconds.Type: GrantFiled: August 31, 2001Date of Patent: February 4, 2003Assignee: Eastman Kodak CompanyInventors: William D. Ramsden, David G. Baird
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Patent number: 6348592Abstract: A method to make squaraine dyes involves the reaction of 1,8-diaminonaphthalene with 1,3-dihydroxyacetone dimer in a first reaction mixture comprising the appropriate solvents to prepare a first intermediate. This first intermediate is then reacted with an organic acylating agent in the presence of a suitable solvent to form a second intermediate. Lastly, after isolation, the second intermediate is reacted with squaric acid in a particular hydroxylic solvent/nonpolar solvent mixture that dissolves squaric acid and forms a ternary azeotrope with water and the water is at least partially removed. The resulting dyes have the following general structure wherein R is an organic radical derived from the organic acylating agent.Type: GrantFiled: September 21, 2000Date of Patent: February 19, 2002Assignee: Eastman Kodak CompanyInventors: William D. Ramsden, Louis F. Valente, Lori S. Bernard
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Patent number: 6329128Abstract: An infrared photosensitive element comprising: a support bearing an infrared radiation-sensitive silver halide material; and an antihalation layer comprising a basic antistatic agent, an acid having a pKa less than 4.2 in an amount equal to at least 1.0% mole equivalent of acid to 1 mole equivalent of amine in said antistatic agent, and sufficient antihalation dye to provide a transmission optical density at the wavelength of maximum absorbence of said dye of at least 0.2 after coating.Type: GrantFiled: May 1, 1995Date of Patent: December 11, 2001Assignee: Eastman Kodak CompanyInventors: Randall H. Helland, Charles W. Gomez, William D. Ramsden
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Publication number: 20010008748Abstract: Photochemical acid progenitors in combination with dihydroperimidine squarylium dyes have been found to be particularly effective at generating acid upon irradiation with near-infrared radiation. It has been found that dihydroperimidine squarylium dyes that are particularly useful in this invention have an oxidation potential greater than about 0.5 V relative to SCE as measured in dichloromethane.Type: ApplicationFiled: February 2, 1998Publication date: July 19, 2001Inventors: STANLEY C. BUSMAN, RICHARD J. ELLIS, JEANNE E. HAUBRICH, WILLIAM D. RAMSDEN, THIEN VAN TRAN, GREGORY D. CUNY
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Patent number: 5763134Abstract: Photochemical acid progenitors in combination with dihydroperimidine squarylium dyes have been found to be particularly effective at generating acid upon irradiation with near-infrared radiation. It has been found that dihydroperimidine squarylium dyes that are particularly useful in this invention have an oxidation potential greater than about 0.5 V relative to SCE as measured in dichloromethane.Type: GrantFiled: May 13, 1996Date of Patent: June 9, 1998Assignee: Imation CorpInventors: Stanley C. Busman, Richard J. Ellis, Jeanne E. Haubrich, William D. Ramsden, Tran Van Thien, Gregory D. Cuny
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Patent number: 5625062Abstract: The present invention provides a novel process for the production of organic solvent soluble squaraine dyes. More specifically, the invention describes how a difficult to prepare tetrahydroxy squaraine intermediate can be prepared in an organic solvent system in the presence of water. This intermediate can then be esterified in pyridine to form the soluble squaraine dye which can then be easily isolated from the reaction mixture. The invention also provides the dyes prepared according to this method.Type: GrantFiled: May 29, 1996Date of Patent: April 29, 1997Assignee: Minnesota Mining and Manufacturing CompanyInventors: Roger A. Mader, William D. Ramsden, Terence D. Spawn, Daniel E. Saddoris
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Patent number: 5395747Abstract: Certain poly(lactic acid) and poly(glycolic acid) polymers or copolymers, and certain carbonates, lactones, lactates, lactylates, lactides, glycolates, glycolylates, and glycolides have been found to stabilize thermal-dye-bleach constructions containing a dye in association with a thermally-generated-bleaching agent. Preferably, the thermally-generated-bleaching agent is a thermal-carbanion-generating agent such as a quaternary ammonium salt of a phenylsulfonylacetic acid or a thermal-nucleophile-generating agent such as an ammonium salt of a phenylsulfonylacetic acid. These materials have been found to be particularly effective when used in acutance and antihalation systems for photothermographic and photographic elements.Type: GrantFiled: December 20, 1993Date of Patent: March 7, 1995Assignee: Minnesota Mining & Manufacturing CompanyInventors: Randall H. Helland, William D. Ramsden, Roger A. Mader
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Patent number: 5384237Abstract: A thermal-dye-bleach construction comprising a dye in association with a thermal dye-bleaching agent of general formula I: ##STR1## wherein: each of R.sup.a and R.sup.b are individually selected from: hydrogen, an alkyl group, an alkenyl group, a cycloalkyl group, an aralkyl group, an aryl group, and a heterocyclic group, and preferably, both R.sup.a and R.sup.b represent hydrogen;p is one or two, and when p is one, Z is a monovalent group selected from: an akyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aralkyl group, an aryl group, and a heterocyclic group, and when p is two, Z is a divalent group selected from: an alkylene group, an arylene group, an alkenylene group, an alkynylene group, an aralkylene group, a cycloalkene group, and a heterocyclic group; and,M.sup.+ is a cation which will not react with a carbanion generated from the thermal-carbanion-generating agent in such manner as to render the carbanion ineffective as a bleaching agent for the dye.Type: GrantFiled: January 25, 1994Date of Patent: January 24, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: Dian E. Stevenson, Mark P. Kirk, Sylvia A. Farnum, William C. Frank, Randall H. Helland, Jonathan P., Kitchin, Roger A. Mader, Mark B. Mizen, Richard A. Newmark, William D. Ramsden, Kumars Sakizadeh, Terence D. Spawn, George V. Tiers
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Patent number: 5380635Abstract: Dihydroperimidine squarylium dyes have been found to be particularly effective when used in acutance and antihalation systems for photothermographic and photographic articles.Type: GrantFiled: February 28, 1994Date of Patent: January 10, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: Charles W. Gomez, Lori S. Harring, Randall H. Helland, William D. Ramsden, Tran Van Thien
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Patent number: 5324627Abstract: A thermal-dye-bleach construction comprising a dye in association with a thermal dye-bleaching agent of general formula I: ##STR1## wherein: each of R.sup.a and R.sup.b are individually selected from: hydrogen, an alkyl group, an alkenyl group, a cycloalkyl group, an aralkyl group, an aryl group, and a heterocyclic group, and preferably, both R.sup.a and R.sup.b represent hydrogen;p is one or two, and when p is one, Z is a monovalent group selected from: an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aralkyl group, an aryl group, and a heterocyclic group, and when p is two, Z is a divalent group selected from: an alkylene group, an arylene group, an alkenylene group, an alkynylene group, an aralkylene group, a cycloalkene group, and a heterocyclic group; and,M.sup.+ is cation which will not react with acarbanion generated from the thermal-carbanion-generating agent in such manner as to render the carbanion ineffective as a bleaching agent for the dye.Type: GrantFiled: December 21, 1992Date of Patent: June 28, 1994Assignee: Minnesota Mining and Manufacturing CompanyInventors: Dian E. Stevenson, Mark P. Kirk, Sylvia A. Farnum, William C. Frank, Randall H. Helland, Jonathan P. Kitchin, Roger A. Mader, Mark B. Mizen, Richard A. Newmark, William D. Ramsden, Kumars Sakizadeh, Terence D. Spawn, George V. Tiers
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Patent number: 5314795Abstract: A thermal-dye-bleach construction comprising a polymethine dye having a nucleus of general formula I: ##STR1## in association with a thermal-carbanion-generating agent having the general formula: ##STR2## wherein the substituents are as defined in the specification and claims.Type: GrantFiled: December 21, 1992Date of Patent: May 24, 1994Assignee: Minnesota Mining and Manufacturing CompanyInventors: Randall H. Helland, Sylvia A. Farnum, Mark P. Kirk, Jonathan P. Kitchin, Roger A. Mader, Mark B. Mizen, Richard A. Newmark, William D. Ramsden, Kumars Sakizadeh, Terence D. Spawn, Dian E. Stevenson, George V. Tiers
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Patent number: RE38251Abstract: Photochemical acid progenitors in combination with dihydroperimidine squarylium dyes have been found to be particularly effective at generating acid upon irradiation with new-infrared radiation. It has been found that dihydroperimidine squarylium dyes that are particularly useful in this invention have an oxidation potential greater than about 0.5 V relative to SCE as measured in dichloromethane.Type: GrantFiled: February 23, 2000Date of Patent: September 16, 2003Assignee: Imation Corp.Inventors: Stanley C. Busman, Richard J. Ellis, Jeanne E. Haubrich, William D. Ramsden, Tran Van Thien, Gregory D. Cuny