Patents by Inventor Dian E. Stevenson
Dian E. Stevenson 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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Patent number: 6291143Abstract: A laser addressable thermal imaging element comprising a bleachable photothermal converting dye in association with a heat-sensitive imaging medium, and a photoreducing agent for said dye, said photoreducing agent bleaching said dye on laser address of the element. The imaging element may be in the form of a colorant transfer system, a peel-apart system, a phototackification system or a unimolecular thermal fragmentation system. Also provided is a method of crosslinking a resin by laser irradiation, which is useful in the production of colored images.Type: GrantFiled: October 16, 2000Date of Patent: September 18, 2001Assignee: Imation Corp.Inventors: Ranjan C. Patel, Robert J. D. Nairne, Andrew W. Mott, Mark R. I. Chambers, Dian E. Stevenson
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Patent number: 6171766Abstract: A laser addressable thermal imaging element comprising a bleachable photothermal converting dye in association with a heat-sensitive imaging medium, and a photoreducing agent for said dye, said photoreducing agent bleaching said dye on laser address of the element. The imaging element may be in the form of a colorant transfer system, a peel-apart system, a phototackification system or a unimolecular thermal fragmentation system. Also provided is a method of crosslinking a resin by leaser irradiation, which is useful in the production of colored images.Type: GrantFiled: May 20, 1999Date of Patent: January 9, 2001Assignee: Imation Corp.Inventors: Ranjan C. Patel, Robert J. D. Nairne, Andrew W. Mott, Mark R. I. Chambers, Dian E. Stevenson
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Patent number: 5945249Abstract: A laser addressable thermal imaging element comprising a bleachable photothermal converting dye in association with a heat-sensitive imaging medium, and a photoreducing agent for said dye, said photoreducing agent bleaching said dye on laser address of the element. The imaging element may be in the form of a colorant transfer system, a peel-apart system, a phototackification system or a unimolecular thermal fragmentation system. Also provided is a method of crosslinking a resin by leaser irradiation, which is useful in the production of colored images.Type: GrantFiled: April 22, 1997Date of Patent: August 31, 1999Assignee: Imation Corp.Inventors: Ranjan C. Patel, Andrew W. Mott, Robert J. D. Nairne, Mark R. I. Chambers, Dian E. Stevenson
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Patent number: 5935758Abstract: A laser-induced thermal imaging system having a donor element and a receptor element. The donor element includes a substrate on which is coated transfer material that includes: a binder including a hydroxylic resin; a fluorocarbon additive; a cationic infrared absorbing dye; a dihydropyridine latent crosslinking agent; and a dispersible material. The receptor element comprises a texturized surface.Type: GrantFiled: April 22, 1997Date of Patent: August 10, 1999Assignee: Imation Corp.Inventors: Ranjan C. Patel, Mark R. I. Chambers, Dian E. Stevenson, Jonathan C. Vogel, Kevin Kidnie, John Souter, Gregory L. Zwaldo
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Patent number: 5843617Abstract: An imaging method is provided that includes a tetraarylpolymethine dye, and bleaching this dye by bringing the dye into contact with a 4-alkyl or 4-unsubstituted 1,4-dihydropyridine derivative.Type: GrantFiled: April 22, 1997Date of Patent: December 1, 1998Assignee: Minnesota Mining & Manufacturing CompanyInventors: Ranjan C. Patel, Mark R. I. Chambers, Dian E. Stevenson, Robert J. D. Nairne, Gregory L. Zwaldo
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Patent number: 5578434Abstract: The present invention relates to a black-and-white aqueous alkaline photographic developer composition, free of dihydroxybenzene developing agent, comprising a reductic acid developing agent and an auxiliary superadditive developing agent, wherein the reductic acid developing agent is represented by the formula (I): ##STR1## wherein, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each are selected from the group consisting of hydrogen and group CH.sub.2 R.sub.5, wherein R.sub.5 is hydrogen or a monovalent group, e.g. amino, cyano, halogen, hydroxyl, carboxyl, sulfonyl, alkyl, cycloalkyl, aryl.A process for forming a black-and-white photographic silver image comprising developing a silver halide photographic element with said black-and-white aqueous alkaline photographic developer composition is also described.Type: GrantFiled: May 15, 1995Date of Patent: November 26, 1996Assignee: Imation Corp.Inventors: Elda Moizo, Carlo Marchesano, Andrew Mott, Dian E. Stevenson
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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: 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: 5266452Abstract: A photographic element containing a thermal-dye-bleach construction includes a thermal nucleophile-generating agent in association with a polymethine dye having a nucleus of general formula (I): ##STR1##Type: GrantFiled: April 30, 1992Date of Patent: November 30, 1993Assignee: Minnesota Mining and Manufacturing CompanyInventors: Jonathan P. Kitchin, Mark P. Kirk, Dian E. Stevenson, Randall H. Helland
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Patent number: 5258274Abstract: A thermal-dye-bleach construction comprising a thermal nucleophile-generating agent in association with a styryl dye having a nucleus of general formula (I): ##STR1## representing the nucleus of a styryl dye in which R=methyl or ethyl groupY=alkoxy of 1 to 20 carbon atomsm=1 or 2,n=1, 2, or 3, andx.sup..crclbar. =an anionThe aromatic fused benzene portion of the indolenine ring may be further substituted with commonly acceptable dye substituents such as alkyl and substituted alkyl (of 1 to 10 carbon atoms) groups, alkoxy groups (preferably of 1 to 10 carbon atoms), fused aromatic rings (as to make the benzene ring a fused naphthalene ring), halogen (including fluoro), cyano, nitro, carboxamido, amido, etc. One or two substituents chosen variously from said group may also be present on the phenyl ring to which the alkoxy group is attached.Type: GrantFiled: May 22, 1992Date of Patent: November 2, 1993Assignee: Minnesota Mining and Manufacturing CompanyInventors: Randall H. Helland, George V. D. Tiers, Dian E. Stevenson
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Patent number: 5135842Abstract: A thermal-dye-bleach construction comprising a thermal nucleophile-generating agent in association with a polymethine dye having a nucleus of general formula (I): ##STR1## in which: n is 0, 1, 2 or 3;R.sup.1 and R.sup.4 are independently selected from the group consisting of hydrogen atoms, optionally substituted alkyl groups of up to 30 carbon atoms, optionally substituted alkenyl groups of up to 30 carbon atoms and optionally substituted aryl groups of up to 14 carbon atoms; andR.sup.1 and R.sup.2 together and/or R.sup.3 and R.sup.4 together may represent the necessary atoms to complete a 5 or 6-membered optionally substituted heterocyclic ring; orone or more of R.sup.1 to R.sup.4 may represent the necessary atoms to complete an optionally substituted 5 or 6-membered heterocyclic ring fused to the phenyl ring on which the NR.sup.1 R.sup.2 or NR.sup.3 R.sup.4 group is attached;R.sup.5 and R.sup.Type: GrantFiled: May 29, 1990Date of Patent: August 4, 1992Assignee: Minnesota Mining and Manufacturing CompanyInventors: Jonathan P. Kitchin, Mark P. Kirk, Dian E. Stevenson, Randall H. Helland