Patents by Inventor A. Prasad

A. Prasad 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: 9187661
    Abstract: An ink composition includes from about 2 wt % to about 5 wt % of a colorant; from about 10 wt % to about 20 wt % of a co-solvent; from about 0.5 wt % to about 1.0 wt % of an alkyl phosphate ester; from about 0.5 wt % to about 9 wt % of any of methyl gluceth-10, methyl gluceth-20, PPG-10 methyl glucose ether, or PPG-20 methyl glucose ether; and a balance of water.
    Type: Grant
    Filed: October 4, 2011
    Date of Patent: November 17, 2015
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: Keshava A. Prasad
  • Patent number: 8974049
    Abstract: A fixer composition is disclosed herein. An example of the fixer composition includes from about 5 wt % to about 25 wt % of a co-solvent, from about 1 wt % to about 20 wt % of a calcium salt, from about 0.01 wt % to about 0.6 wt % of a sulfonated chelating agent, and a balance of water.
    Type: Grant
    Filed: January 30, 2013
    Date of Patent: March 10, 2015
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Keshava A. Prasad, Fereshteh Khorrami
  • Patent number: 8857963
    Abstract: Ink sets can include a plurality of aqueous inks. In one embodiment, a first ink can include a magenta dye and a magenta pigment. A second ink can include a cyan pigment, and a third ink can include a yellow pigment, wherein the second and third inks are substantially devoid of dye. The inks can independently include 2-pyrrolidone or 2-hydroxyethyl-2-pyrrolidone and an additional solvent selected from a glycol, a second pyrrolidone, and mixtures thereof. In another embodiment, an aqueous ink-jet ink can comprise a pigment and a liquid vehicle including water, 2-pyrrolidone, 2-hydroxyethyl-2-pyrrolidone, tetraethylene glycol, and 1,6-hexanediol.
    Type: Grant
    Filed: April 29, 2008
    Date of Patent: October 14, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: George Sarkisian, Keshava A. Prasad, Heng Siong Low
  • Publication number: 20140300673
    Abstract: An ink composition is disclosed herein. The ink composition includes from about 5 wt % to about 25 wt % of a co-solvent; from about 0.025 wt % to about 0.2 wt % of i) a chelating agent represented by formula 1, wherein R? is a carboxylic acid functional group or a carboxylate salt functional group and n>2; ii) a chelating agent represented by formula 2:, wherein R is a carboxylic acid functional group or a carboxylate salt functional group, m is greater than or equal to 1, x is greater than or equal to 2, y is greater than or equal to 1, and z is greater than or equal to 2; iii) a chelating agent represented by formula 3, wherein any of r, s, t, or u is a sulfonic acid functional group or a sulfonate functional group; or iv) combinations of any of i, ii, and iii. The ink composition also includes a balance of water.
    Type: Application
    Filed: October 25, 2011
    Publication date: October 9, 2014
    Inventors: Keshava A. Prasad, Xiaohe Chen, Fereshteh Khorrami, Yi-Hua Tsao, Dennis Z. Guo
  • Publication number: 20140253650
    Abstract: The present disclosure is drawn to ink-jet ink sets, as well as related systems and methods. In one example, an ink set for ink-jet printing can comprise a cyan ink-jet ink including from about 2 wt % to about 5 wt % of a cyan pigment admixed in a first ink vehicle; a magenta ink-jet ink including a magenta colorant comprising from about 2 wt % to about 5 wt % of a magenta pigment and about 0.1 wt % to about 1 wt % of a slightly soluble magenta dye admixed in a second ink vehicle; and a yellow ink-jet ink including from about 2 wt % to about 5 wt % of a yellow pigment admixed in a third ink vehicle.
    Type: Application
    Filed: October 28, 2011
    Publication date: September 11, 2014
    Inventors: George Sarkisian, Keshava A. Prasad, John Morrow Gardner, Tayo Olu Yolemi
  • Publication number: 20140247312
    Abstract: An ink composition includes from about 2 wt % to about 5 wt % of a colorant; from about 10 wt % to about 20 wt % of co-solvent; from about 0.5 wt % to about 1.0 wt % of an alkyl phosphate ester; from about 0.5 wt % to about 9 wt % of any of methyl gluceth-10, methyl gluceth-20, PPG-10 methyl glucose ether, or PPG-20 methyl glucose ether; and a balance of water.
    Type: Application
    Filed: October 4, 2011
    Publication date: September 4, 2014
    Inventor: Keshava A. Prasad
  • Publication number: 20130307914
    Abstract: An inkjet ink set includes a black ink, a yellow ink, a cyan ink, and a magenta ink. The magenta ink includes an ink vehicle including a polyurethane binder, and a dispersed magenta pigment in the ink vehicle. The magenta pigment is chosen from Pigment Red 282.
    Type: Application
    Filed: January 31, 2011
    Publication date: November 21, 2013
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Xiaohe Chen, Pradeep Kumar Koyadan Kizhakkedath, Dennis P. Parazak, Keshava A. Prasad, Savka Ilieva Stoeva, Yi-Hua Tsao, Tze Hwei Tseeng, Ervin Mubarekyan
  • Patent number: 8573762
    Abstract: The present disclosure provides sustained decap for inkjet inks and related methods. As such, an inkjet ink composition can comprise a linear polyurethane binder having a weight average molecular weight of less than 50,000 Mw; from 5 wt % to 20 wt % of an organic cosolvent system including a first organic cosolvent selected from the group of 2-hydroxyethylurea, 1,2,6-hexanetriol, di-(2-hydoxyethyl)-5,5-dimethylhydantoin, 1,1,1,-tris(hydroxymethyl)ethane, 1,2,4-butanetriol, and mixtures thereof; water; and a colorant. Additionally, the organic cosolvent system can also comprise less than 5 wt % total organic cosolvent having a boiling point less than 250° C. based on the weight of the inkjet ink composition.
    Type: Grant
    Filed: November 16, 2012
    Date of Patent: November 5, 2013
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: Keshava A. Prasad
  • Publication number: 20130286081
    Abstract: Ink sets can include a plurality of aqueous inks. In one embodiment, a first ink can include a magenta dye and a magenta pigment. A second ink can include a cyan pigment, and a third ink can include a yellow pigment, wherein the second and third inks are substantially devoid of dye. The inks can independently include 2-pyrrolidone or 2-hydroxyethyl-2-pyrrolidone and an additional solvent selected from a glycol, a second pyrrolidone, and mixtures thereof. In another embodiment, an aqueous ink-jet ink can comprise a pigment and a liquid vehicle including water, 2-pyrrolidone, 2-hydroxyethyl-2-pyrrolidone, tetraethylene glycol, and 1,6-hexanediol.
    Type: Application
    Filed: April 29, 2008
    Publication date: October 31, 2013
    Inventors: George Sarkisian, Keshava A. Prasad, Heng Siong Low
  • Publication number: 20120192280
    Abstract: A system that incorporates teachings of the present disclosure may include, for example, constructing a symbolic representation from a portion of a web application that generates a plurality of structured query language (SQL) queries, parsing the symbolic representation into a plurality of trees, and adapting the web application with PREPARE statements according to the plurality of trees. Additional embodiments are disclosed.
    Type: Application
    Filed: January 17, 2012
    Publication date: July 26, 2012
    Applicant: Board of Trustees of the University of Illinois
    Inventors: V.N. Venkatakrishnan, Prithvi Bisht, A. Prasad Sistla
  • Patent number: 7722179
    Abstract: An inkjet fixer composition and a printing method and system used with the composition are disclosed herein. The composition includes: a) from 1 to 8 weight percent cationic polymer; and b) from 0 to 2 weight percent of at least one surfactant selected from the group consisting of nonionic surfactant, cationic surfactant and combinations thereof; and c) an aqueous liquid vehicle. Upon overprinting the fixer composition with an ink-jet ink on a substrate, the fixer composition vehicle and the ink-jet ink vehicle form a vehicle mixture on the substrate after which the vehicle mixture penetrates into the substrate, and an ink image is formed on the substrate.
    Type: Grant
    Filed: March 30, 2006
    Date of Patent: May 25, 2010
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Ervin Mubarekyan, George M. Sarkisian, Keshava A. Prasad, Richard Anderson
  • Patent number: 7677714
    Abstract: A printing system for use in inkjet printing. The printing system includes an inkjet ink having a free binder, an additional free binder, and a chemically modified pigment, a fixer fluid and a porous print medium.
    Type: Grant
    Filed: March 2, 2005
    Date of Patent: March 16, 2010
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: George Sarkisian, Xiaohe Chen, Keshava A. Prasad
  • Patent number: 7622513
    Abstract: An inkjet printing system that includes a fixer fluid and a pigment-based inkjet ink. The fixer fluid includes a cationic polymer and an acidic crashing agent. The inkjet ink includes an anionic pigment and at least one of the following: at least one nonionic surfactant present in the inkjet ink at less than or equal to approximately 0.1% by weight, at least one anionic binder present in the inkjet ink at less than or equal to approximately 2% by weight, and less than or equal to approximately 20% by weight of at least one organic solvent.
    Type: Grant
    Filed: December 1, 2004
    Date of Patent: November 24, 2009
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: George Sarkisian, Keshava A. Prasad
  • Patent number: 7572326
    Abstract: A fixer fluid for an inkjet ink set includes an aqueous vehicle, and a tri-alkyl-substituted amine-N-oxide. The fixer fluid also includes an acid, a cationic polyelectrolyte, or combinations of the acid and polyelectrolyte(s).
    Type: Grant
    Filed: April 18, 2007
    Date of Patent: August 11, 2009
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Mark L. Choy, Gary W. Byers, Yi-Hua Tsao, George Sarkisian, Keshava A. Prasad, Christian Schmid, Ervin Mubarekyan
  • Patent number: 7567566
    Abstract: A method and apparatus to perform aging are described. A method to perform timing comprises receiving an address and retrieving an age zone value associated with the received address. A time is then determined using the retrieved age zone value. The determined time may then be associated with the received address.
    Type: Grant
    Filed: August 29, 2003
    Date of Patent: July 28, 2009
    Assignee: Intel Corporation
    Inventors: Kavitha A. Prasad, Miguel A. Guerrero
  • Patent number: 7478902
    Abstract: In accordance with the present invention an inkjet composition is provided. The inkjet composition includes an anionic dye, at least one pigment, and an acidic fluid fixer, wherein the acidic fluid fixer includes at least one cationic component. Also provided are methods of printing images using an inkjet printer. Also provided are inkjet printers that include the inkjet composition.
    Type: Grant
    Filed: November 4, 2004
    Date of Patent: January 20, 2009
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Keshava A. Prasad, George Sarkisian, Yi-Hua Tsao, Richard B. Anderson
  • Publication number: 20080257203
    Abstract: A fixer fluid for an inkjet ink set includes an aqueous vehicle, and a tri-alkyl-substituted amine-N-oxide. The fixer fluid also includes an acid, a cationic polyelectrolyte, or combinations of the acid and polyelectrolyte(s).
    Type: Application
    Filed: April 18, 2007
    Publication date: October 23, 2008
    Inventors: Mark L. Choy, Gary W. Byers, Yi-Hua Tsao, George Sarkisian, Keshava A. Prasad, Christian Schmid, Ervin Mubarekyan
  • Publication number: 20070231340
    Abstract: An immunogenic composition having 13 distinct polysaccharide-protein conjugates and optionally, an aluminum-based adjuvant, is described. Each conjugate contains a capsular polysaccharide prepared from a different serotype of Streptococcus pneumoniae (1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F and 23F) conjugated to a carrier protein. The immunogenic composition, formulated as a vaccine, increases coverage against pneumococcal disease in infants and young children globally, and provides coverage for serotypes 6A and 19A that is not dependent on the limitations of serogroup cross-protection. Also described is a method for making an immunogenic conjugate comprising Streptococcus pneumoniae serotype 3 polysaccharide covalently linked to a carrier protein, the method including periodic acid oxidation of the polysaccharide in the presence of bivalent cations.
    Type: Application
    Filed: December 22, 2006
    Publication date: October 4, 2007
    Applicant: Wyeth
    Inventors: William Hausdorff, George Siber, Peter Paradiso, A. Prasad
  • Publication number: 20070184072
    Abstract: An immunogenic composition having 13 distinct polysaccharide-protein conjugates and optionally, an aluminum-based adjuvant, is described. Each conjugate contains a capsular polysaccharide prepared from a different serotype of Streptococcus pneumoniae (1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F and 23F) conjugated to a carrier protein. The immunogenic composition, formulated as a vaccine, increases coverage against pneumococcal disease in infants and young children globally, and provides coverage for serotypes 6A and 19A that is not dependent on the limitations of serogroup cross-protection. Also described is a method for making an immunogenic conjugate comprising Streptococcus pneumoniae serotype 1 polysaccharide covalently linked to a carrier protein, the method including partial de-O-acetylation of the polysaccharide by mild hydrolysis in an alkaline pH buffer.
    Type: Application
    Filed: December 22, 2006
    Publication date: August 9, 2007
    Applicant: Wyeth
    Inventors: William Hausdorff, George Siber, Peter Paradiso, A. Prasad
  • Publication number: 20070184071
    Abstract: An immunogenic composition having 13 distinct polysaccharide-protein conjugates and optionally, an aluminum-based adjuvant, is described. Each conjugate contains a capsular polysaccharide prepared from a different serotype of Streptococcus pneumoniae (1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F and 23F) conjugated to a carrier protein. The immunogenic composition, formulated as a vaccine, increases coverage against pneumococcal disease in infants and young children globally, and provides coverage for serotypes 6A and 19A that is not dependent on the limitations of serogroup cross-protection. Methods for making an immunogenic conjugate comprising Streptococcus pneumoniae serotype 19A polysaccharide are also provided in which the serotype 19A polysaccharide is co-lyophilized with a carrier protein and conjugation is carried out in dimethyl sulfoxide (DMSO) via a reductive amination mechanism.
    Type: Application
    Filed: December 22, 2006
    Publication date: August 9, 2007
    Applicant: Wyeth
    Inventors: William Hausdorff, George Siber, Peter Paradiso, A. Prasad