Patents by Inventor Amiya K Chatterjee
Amiya K Chatterjee 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: 8268910Abstract: Inkjet ink compositions and methods for increasing inkjet ink particle stability are disclosed herein. In an embodiment, a latex polymer-containing inkjet ink composition comprises a secondary alcohol ethoxylate and a fluoro-surfactant at a concentration ratio effective to increase particle stability of the inkjet ink composition when the pigment particles are substantially electrostatically dispersed. In another embodiment, an inkjet ink composition comprises a latex dispersion having a conductivity of no more than about 1.5 mS/cm.Type: GrantFiled: December 14, 2007Date of Patent: September 18, 2012Assignee: Hewlett-Packard Development Company, L.P.Inventors: John M. Gardner, Radha Sen, Amiya K. Chatterjee
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Publication number: 20100292372Abstract: Inkjet ink compositions and methods for increasing inkjet ink particle stability are disclosed herein. In an embodiment, a latex polymer-containing inkjet ink composition comprises a secondary alcohol ethoxylate and a fluoro-surfactant at a concentration ratio effective to increase particle stability of the inkjet ink composition when the pigment particles are substantially electrostatically dispersed. In another embodiment, an inkjet ink composition comprises a latex dispersion having a conductivity of no more than about 1.5 mS/cm.Type: ApplicationFiled: December 14, 2007Publication date: November 18, 2010Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANYInventors: John M. Gardner, Radha Sen, Amiya K. Chatterjee
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Patent number: 7066590Abstract: Combinations of cationic underprinting fluids and anionic ink compositions that together achieve improved color quality and image stability in ink-jet printed images.Type: GrantFiled: April 1, 2004Date of Patent: June 27, 2006Assignee: Hewlett-Packard Development Company, L.P.Inventors: Shirley Lee, Gary W. Byers, Alexey S Kabalnov, Mark H. Kowalski, Amiya K. Chatterjee, Keshava A Prasad, David M. Schut
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Patent number: 6866381Abstract: Smear resistant ink jet ink images and methods for making such are disclosed and described. Generally, a smear resistant ink jet ink image includes an ink jet ink image upon a print substrate, and a water insoluble protective film having contact with the ink jet ink in the image. In one aspect, the film may include a combination of water soluble film forming polymers that become water insoluble upon interaction with one another. In another aspect, the water soluble film forming polymers may be interacted at the print substrate to form the water insoluble film.Type: GrantFiled: September 30, 2002Date of Patent: March 15, 2005Assignee: Hewlett-Packard Development Company, L.P.Inventors: Anne M. Kelly-Rowley, Melissa D. Lee, Amiya K Chatterjee
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Patent number: 6818048Abstract: The present invention provides ink-jet inks for ink-jet printing, comprising from 0.1% to 5% by weight of at least one dye; from 8% to 20% by weight of a diol selected from the group consisting of 1,2-pentanediol, 1,2-hexanediol, and combinations thereof; from 0.1% to 5% by weight of an aliphatic alcohol or aliphatic alcohol mixture; and from 0.1% to 1.5% by weight of at least one component independently selected from the group consisting of buffers, biocides, and metal chelators, with the proviso that no surfactant is present in the ink-jet ink composition. The ink-jet inks formulated according to the present invention provide good dot size, color-to-color bleed alleviation, improved coalescence, less chia, and improved print head materials compatibility.Type: GrantFiled: October 30, 2001Date of Patent: November 16, 2004Assignee: Hewlett-Packard Development Company, L.P.Inventors: Keshava A. Prasad, Amiya K. Chatterjee, John M. Gardner, Anne M. Kelly-Rowley
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Patent number: 6808556Abstract: The inks provide excellent ink-jet prints having excellent imaging onto glossy inkjet media with increased dot size leading to improved dot visibility and banding robustness of the image. The aqueous inks each comprise from about 0.1 to about 20 wt % of at least one colorant (CMYK) with the black ink comprising from about 0.5 to about 20 wt % of at least one colorant; from about 7 to about 20 wt % of at least one 1,2-diol, from about 0.5% to about 2 wt % of a mono- or di-hydric alcohol; 0 to about 1.5 wt % of at least one component independently selected from the group consisting of buffers, biocides, and metal chelators; and the balance water. The formulations are substantially free of surfactants and other solvents.Type: GrantFiled: October 29, 2001Date of Patent: October 26, 2004Assignee: Hewlett-Packard Development Company, L.P.Inventors: Ann M. Kelly-Rowley, Amiya K. Chatterjee
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Publication number: 20040189775Abstract: Combinations of cationic underprinting fluids and anionic ink compositions that together achieve improved color quality and image stability in ink-jet printed images.Type: ApplicationFiled: April 1, 2004Publication date: September 30, 2004Inventors: Shirley Lee, Gary W. Byers, Alexey S. Kabalnov, Mark H. Kowalski, Amiya K. Chatterjee, Keshava A. Prasad, David M. Schut
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Publication number: 20040154497Abstract: The present invention provides ink-jet inks for ink-jet printing, comprising from 0.1% to 5% by weight of at least one dye; from 8% to 20% by weight of a diol selected from the group consisting of 1,2-pentanediol, 1,2-hexanediol, and combinations thereof; from 0.1% to 5% by weight of an aliphatic alcohol or aliphatic alcohol mixture; and from 0.1% to 1.5% by weight of at least one component independently selected from the group consisting of buffers, biocides, and metal chelators, with the proviso that no surfactant is present in the inkjet ink composition. The ink-jet inks formulated according to the present invention provide good dot size, color-to-color bleed alleviation, improved coalescence, less chia, and improved print head materials compatibility.Type: ApplicationFiled: October 30, 2001Publication date: August 12, 2004Inventors: Keshava A. Prasad, Amiya K. Chatterjee, John M. Gardner, Anne M. Kelly-Rowley
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Patent number: 6740689Abstract: Combinations of cationic underprinting fluids and anionic ink compositions that together achieve improved color quality and image stability in ink-jet printed images.Type: GrantFiled: October 30, 2000Date of Patent: May 25, 2004Assignee: Hewlett-Packard Development Company, L.P.Inventors: Shirley Lee, Gary W Byers, Alexey S Kabalnov, Mark H. Kowalski, Amiya K. Chatterjee, Keshava A Prasad, David M. Schut
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Publication number: 20040061756Abstract: Smear resistant ink jet ink images and methods for making such are disclosed and described. Generally, a smear resistant ink jet ink image includes an ink jet ink image upon a print substrate, and a water insoluble protective film having contact with the ink jet ink in the image. In one aspect, the film may include a combination of water soluble film forming polymers that become water insoluble upon interaction with one another. In another aspect, the water soluble film forming polymers may be interacted at the print substrate to form the water insoluble film.Type: ApplicationFiled: September 30, 2002Publication date: April 1, 2004Inventors: Anne M. Kelly-Rowley, Melissa D. Lee, Amiya K. Chatterjee
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Patent number: 6660072Abstract: Improved inkjet ink compositions have a sufficient amount of an acetylenic alcohol incorporated therein to reduce the corrosiveness of the ink without adversely affecting the printing characteristics of the ink composition. The inkjet ink compositions of the invention include a carrier, a colorant that is soluble or dispersable in said carrier, and a sufficient quantity of at least one acetylenic alcohol to reduce the corrosiveness of said ink composition to metal placed in contact with said ink composition. The inkjet ink compositions may also include at least one acetylenic alcohol that contains a terminal acetylene and an &agr;-hydroxy group. A method for reducing corrosiveness of an inkjet ink composition includes adding to said inkjet ink composition a sufficient quantity of at least one acetylenic alcohol to reduce the corrosiveness of said ink composition to metal placed in contact with said ink composition.Type: GrantFiled: December 21, 2001Date of Patent: December 9, 2003Assignee: Hewlett-Packard Development Company, L.P.Inventor: Amiya K Chatterjee
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Patent number: 6610129Abstract: An ink-jet ink composition and a method of printing with the ink composition comprising at least one colorant and an aqueous vehicle comprising at least one refractory or noble metal-reactive component.Type: GrantFiled: April 5, 2000Date of Patent: August 26, 2003Assignee: Hewlett-Packard Development CompanyInventors: Richard A Sader, Paul J. Bruinsma, Amiya K Chatterjee, Howard A Doumaux, Noah C. Lassar, Matthew D Giere
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Publication number: 20030116060Abstract: Improved inkjet ink compositions have a sufficient amount of an acetylenic alcohol incorporated therein to reduce the corrosiveness of the ink without adversely affecting the printing characteristics of the ink composition. The inkjet ink compositions of the invention include a carrier, a colorant that is soluble or dispersable in said carrier, and a sufficient quantity of at least one acetylenic alcohol to reduce the corrosiveness of said ink composition to metal placed in contact with said ink composition. The inkjet ink compositions may also include at least one acetylenic alcohol that contains a terminal acetylene and an &agr;-hydroxy group. A method for reducing corrosiveness of an inkjet ink composition includes adding to said inkjet ink composition a sufficient quantity of at least one acetylenic alcohol to reduce the corrosiveness of said ink composition to metal placed in contact with said ink composition.Type: ApplicationFiled: December 21, 2001Publication date: June 26, 2003Inventor: Amiya K. Chatterjee
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Publication number: 20030079650Abstract: The present invention provides ink-jet inks for ink-jet printing, comprising from 0.1% to 5% by weight of at least one dye; from 8% to 20% by weight of a diol selected from the group consisting of 1,2-pentanediol, 1,2-hexanediol, and combinations thereof; from 0.1% to 5% by weight of an aliphatic alcohol or aliphatic alcohol mixture; and from 0.1% to 1.5% by weight of at least one component independently selected from the group consisting of buffers, biocides, and metal chelators, with the proviso that no surfactant is present in the inkjet ink composition. The ink-jet inks formulated according to the present invention provide good dot size, color-to-color bleed alleviation, improved coalescence, less chia, and improved print head materials compatibility.Type: ApplicationFiled: October 30, 2001Publication date: May 1, 2003Inventors: Keshava A. Prasad, Amiya K. Chatterjee, John M. Gardner, Anne M. Kelly-Rowley
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Publication number: 20030079649Abstract: The inks provide excellent ink-jet prints having excellent imaging onto glossy inkjet media with increased dot size leading to improved dot visibility and banding robustness of the image. The aqueous inks each comprise from about 0.1 to about 20 wt % of at least one colorant (CMYK) with the black ink comprising from about 0.5 to about 20 wt % of at least one colorant; from about 7 to about 20 wt % of at least one 1,2-diol, from about 0.5% to about 2 wt % of a mono- or di-hydric alcohol; 0 to about 1.5 wt % of at least one component independently selected from the group consisting of buffers, biocides, and metal chelators; and the balance water. The formulations are substantially free of surfactants and other solvents.Type: ApplicationFiled: October 29, 2001Publication date: May 1, 2003Inventors: Anne M. Kelly-Rowley, Amiya K. Chatterjee
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Patent number: 5629047Abstract: A latex useful as a binder for paper, nonwovens, and textiles is prepared by copolymerizing in aqueous emulsion using a redox initiator at 5.degree. C. a mixture of 35 to 60% weight of a conjugated diene monomer and from about 30 to 65% by weight of a vinyl aryl monomer. Additional improvements can be obtained by incorporating in the mixture a small percentage by weight of copolymerizable monomers such as acrylic acid, methacrylic acid, itaconic acid and/or a functional type monomer having an activatable methyl, ethyl, propyl or butyl ester group and a vinyl group.Type: GrantFiled: August 6, 1990Date of Patent: May 13, 1997Assignee: GenCorp Inc.Inventors: Satish C. Sharma, Amiya K. Chatterjee, Ronald D. Mohan, Friedhold Schon