Patents by Inventor Rolf Dessauer
Rolf Dessauer 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: 7462443Abstract: Compositions and systems for labeling substrates, such as optical disks, using leuco dye-containing coating compositions are described. The composition can comprise a color forming composition, an electromagnetic radiation absorber, and a stabilizing agent. The color forming composition can include a leuco dye, a hexaarylbiimidazole activator, and an acid-generating source. The absorber can be admixed with or in thermal contact with the color forming composition. The stabilizing agent can be configured for protecting the leuco dye upon exposure to ambient light, wherein the stabilizing agent comprises a diarylguanidine dye salt. The coating composition can be optimized for development using electromagnetic radiation having a frequency from about 760 nm and 800 nm.Type: GrantFiled: September 5, 2003Date of Patent: December 9, 2008Assignee: Hewlett-Packard Development Company, L.P.Inventors: Randall Orson Willard, Rolf Dessauer
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Patent number: 7005407Abstract: A thermally imageable element having a thermally imageable layer, wherein the thermally imageable layer has a thermal amplification additive and a stabilizer selected from the group consisting of phenolic type compounds and amine type compounds. These stabilizers present in thermally imageable layers maintain NIR stability during manufacture, and when the thermally imageable elements containing them are used in thermal imaging processes.Type: GrantFiled: November 16, 2001Date of Patent: February 28, 2006Assignee: E. I. du Pont de Nemours and CompanyInventors: Rolf Dessauer, Jeffrey Jude Patricia, Gregory Charles Weed
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Publication number: 20050053864Abstract: Compositions and methods for production of color images using phthalocyanine precursor-containing color forming compositions are described. The color forming composition can include a phthalocyanine precursor, an infrared absorber, and a binder. The color forming composition can be optimized for development in less than 1 msec using infrared radiation. The phthalocyanine precursor can include a phthalocyanine and a leaving group, or groups, each coordinated to a metal. The color forming compositions are ambient light stable and are useful in forming images on a wide variety of substrates.Type: ApplicationFiled: September 5, 2003Publication date: March 10, 2005Inventor: Rolf Dessauer
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Publication number: 20050053870Abstract: Compositions and systems for labeling substrates, such as optical disks, using leuco dye-containing coating compositions are described. The composition can comprise a color forming composition, an electromagnetic radiation absorber, and a stabilizing agent. The color forming composition can include a leuco dye, a hexaarylbiimidazole activator, and an acid-generating source. The absorber can be admixed with or in thermal contact with the color forming composition. The stabilizing agent can be configured for protecting the leuco dye upon exposure to ambient light, wherein the stabilizing agent comprises a diarylguanidine dye salt. The coating composition can be optimized for development using electromagnetic radiation having a frequency from about 760 nm and 800 nm.Type: ApplicationFiled: September 5, 2003Publication date: March 10, 2005Inventors: Randall Willard, Rolf Dessauer
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Publication number: 20040027445Abstract: A thermally imageable element having a thermally imageable layer, wherein the thermally imageable layer has a thermal amplification additive and a stabilizer selected from the group consisting of phenolic type compounds and amine type compounds. These stabilizers present in thermally imageable layers maintain NIR stability during manufacture, and when the thermally imageable elements containing them are used in thermal imaging processes.Type: ApplicationFiled: May 16, 2003Publication date: February 12, 2004Inventors: Rolf Dessauer, Jeffrey Jude Patricia, Gregory Charles Weed
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Patent number: 6251571Abstract: Novel thermally imageable monochrome product compositions, elements, and processes are disclosed herein. These compositions and elements characteristically have high contrast and fast imaging speeds. The thermally imageable compositions of this invention contain at least one polymeric binder, a specified leuco dye and a specified hydroxylamine compound. These compositions have the propensity for affording, upon thermal imaging, highly colored images having high optical density values. At the same time, background color is low in preferred compositions even after extensive exposure to ambient light. These compositions can be imagewise heated to effect color formation (i.e., generation of an image) or, in case of compositions containing at least one near IR-absorbing dye, can be imagewise exposed to near IR radiation from a laser or other device to effect color formation (i.e., generation of an image).Type: GrantFiled: March 10, 1998Date of Patent: June 26, 2001Assignee: E. I. du Pont de Nemours and CompanyInventors: Rolf Dessauer, Jonathan V Caspar
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Patent number: 5858583Abstract: Novel thermally imageable monochrome product compositions, elements, and processes are disclosed herein. These compositions and elements characteristically have high contrast and fast imaging speeds. The thermally imageable compositions of this invention comprise (a) at least one hexaarylbiimidazole (HABI) compound, (b) at least one leuco dye, (c) at least one acid-generating compound, (d) a polymeric binder, (e) optionally at least one UV stabilizer and/or at least one inhibitor of color formation, and, in certain embodiments, (f) at least one near IR-absorbing dye. These compositions have the propensity for affording, upon thermal imaging, highly colored images having high optical density values. At the same time, background color is low in preferred compositions even after extensive exposure to ambient light. These compositions can be imagewise heated to effect color formation (i.e.Type: GrantFiled: July 3, 1997Date of Patent: January 12, 1999Assignee: E. I. du Pont de Nemours and CompanyInventors: Rolf Dessauer, Jonathan V. Caspar
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Patent number: 4945020Abstract: High resolution, photosensitive electrostatic master which is positive-working with a single imagewise exposure comprising a conductive support bearing a layer of a photosensitive composition consisting essentially of (A) at least one polymeric binder, (B) a hexaarylbiimidazole photooxidant, (C) leuco dye, preferably stabilized, oxidized by (B), (D) a nonionic halogenated compound, preferably a hydrocarbon, and (E) compatible plasticizer. A process of making positive images by a single imagewise exposure is described. The master is useful in making proofs that duplicate the image achieved by printing, etc.Type: GrantFiled: June 30, 1989Date of Patent: July 31, 1990Assignee: E. I. Du Pont de Nemours and CompanyInventors: Richard J. Kempf, Rolf Dessauer, Steven C. Freilich
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Patent number: 4818660Abstract: Photohardenable electrostatic master comprising an electrically conductive substrate, e.g., aluminized polyethylene terephthalate, bearing a layer of a photopolymer comprising an organic polymeric binder, compound having at least one ethylenically unsaturated group, photoinitiator, an aromatic amino compound, as defined, and an acid, e.g., p-toluene sulfonic acid, or an oxidized substituted aromatic amino compound. The photohardenable electrostatic master having improved charge decay and backtransfer is used for electrostatic proofing, etc.Type: GrantFiled: November 4, 1987Date of Patent: April 4, 1989Assignee: E. I. Du Pont De Nemours and CompanyInventors: Graciela B. Blanchet-Fincher, Curtis R. Fincher, Jr., Lawrence K.-F. Cheung, Rolf Dessauer, Catharine E. Looney
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Patent number: 4732831Abstract: Xeroprinting process involving imagewise exposing a photopolymer master, charging on a conductive support, toning with dry or liquid electrostatic toner, and transferring to another surface. Photopolymer systems comprising preferred combinations of polymeric binders, ethylenically unsaturated monomers. HABI initiators and chain transfer agents.Type: GrantFiled: June 1, 1987Date of Patent: March 22, 1988Assignee: E. I. Du Pont de Nemours and CompanyInventors: James Riesenfeld, William Bindloss, Graciella Blanchet, Rolf Dessauer, Alan S. Dubin
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Patent number: 4311783Abstract: Photoimaging compositions comprising (A) 2,4,5-triphenylimidazolyl dimer having selected substituents on the 2,4 and 5 phenyl rings and an extinction coefficient determined in methylene chloride at 10.sup.-5 to 10.sup.-3 mol/liter at 350 nm of at least 4000 liters/mol-cm and at 400 nm of at least 250 liters/mol-cm; and at least one of (B1) leuco dye or (B2) addition polymerizable ethylenically unsaturated monomeric compound. The new imaging compositions are useful in preparing dual response photoimaging products such as proofing papers, printout paper, overlay films and photopolymerizable elements. Improved imaging speed is achieved at equal concentration levels when compared with conventional 2,4,5-triphenylimidazolyl dimers.Type: GrantFiled: July 17, 1980Date of Patent: January 19, 1982Assignee: E. I. Du Pont de Nemours and CompanyInventor: Rolf Dessauer
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Patent number: 4252887Abstract: Photoimaging compositions comprising (A) 2,4,5-triphenylimidazolyl dimer having selected substituents on the 2,4 and 5 phenyl rings and an extinction coefficient determined in methylene chloride at 10.sup.-5 to 10.sup.-3 mol/liter at 350 nm of at least 4000 liters/mol-cm and at 400 nm of at least 250 liters/mol-cm; and at least one of (B1) leuco dye or (B2) addition polymerizable ethylenically unsaturated monomeric compound. The new imaging compositions are useful in preparing dual response photoimaging products such as proofing papers, printout paper, overlay films and photopolymerizable elements. Improved imaging speed is achieved at equal concentration levels when compared with conventional 2,4,5-triphenylimidazolyl dimers.Type: GrantFiled: August 14, 1979Date of Patent: February 24, 1981Assignee: E. I. Du Pont de Nemours and CompanyInventor: Rolf Dessauer
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Patent number: 4247618Abstract: A photosensitive system comprising in intimate admixture (1) a dye in its leuco form, (2) a photooxidant taken from the group of hexaarylbiimidazole compounds, benzophenone, para-aminophenyl ketones, polynuclear quinones and thioxanthenones, and mixtures thereof and in the presence of the admixture is a 5-member-heterocyclic phenylhydrazide compound. The cyclic phenylhydrazide can be present in the admixture, or a dry coating of the admixture, after imagewise exposure, is treated with a solution of the heterocyclic compound. The system is useful in formation of colored images.Type: GrantFiled: May 11, 1979Date of Patent: January 27, 1981Assignee: E. I. Du Pont de Nemours and CompanyInventors: Rolf Dessauer, Raymond A. Firmani
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Patent number: 4232108Abstract: A marking transfer sheet comprising an imaging layer of pigment, binder and a color-forming, radiation-sensitive component on a carrier film and a process for its use comprising exposing the imaging layer to a pattern of radiation to form a mark, heating the imaging layer until adhesive, and contacting the imaging layer with a support more adherent to the imaging layer than the carrier film; and optionally separating the carrier film from the imaging layer.Type: GrantFiled: May 1, 1979Date of Patent: November 4, 1980Assignee: E. I. Du Pont de Nemours and CompanyInventor: Rolf Dessauer
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Patent number: 4207102Abstract: A marking transfer sheet comprising an imaging layer of pigment, binder and a color-forming, radiation-sensitive component on a carrier film and a process for its use comprising exposing the imaging layer to a pattern of radiation to form a mark, heating the imaging layer until adhesive, and contacting the imaging layer with a support more adherent to the imaging layer than the carrier film; and optionally separating the carrier film from the imaging layer.Type: GrantFiled: March 8, 1978Date of Patent: June 10, 1980Assignee: E. I. Du Pont de Nemours and CompanyInventor: Rolf Dessauer
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Patent number: 4029506Abstract: Described are a marking composition of a color-forming, radiation-sensitive component, a diffusely reflecting pigment and a binder, and a process for the use of the same comprising coating a product surface with the marking composition; exposing the coating to a pattern of radiation to form a marking; and then reading the marking with a diffuse reflectance scanning means.Type: GrantFiled: September 22, 1976Date of Patent: June 14, 1977Assignee: E. I. Du Pont de Nemours and CompanyInventor: Rolf Dessauer