Patents by Inventor Prabhakara S. Rao

Prabhakara S. Rao 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: 8193267
    Abstract: A polymer composition that includes a hydrophilic polymer, an optional secondary organic polymer, and a bioactive agent distributed therein, wherein the bioactive agent is selected from the group consisting of a silver compound, a copper compound, a zinc compound, and combinations thereof.
    Type: Grant
    Filed: May 19, 2010
    Date of Patent: June 5, 2012
    Assignee: 3M Innovative Properties Company
    Inventors: Scott A. Burton, Patrick D. Hyde, Prabhakara S. Rao, Caroline M. Ylitalo
  • Patent number: 8076389
    Abstract: An adhesive composition including an etchant for a hard tissue surface, at least one multifunctional crosslinkable (meth)acrylate monomer with a functionality greater than 4, and water. The adhesive composition is a water-in-oil emulsion.
    Type: Grant
    Filed: December 17, 2007
    Date of Patent: December 13, 2011
    Assignee: 3M Innovative Properties Company
    Inventors: Prabhakara S. Rao, Steven M. Aasen, Ahmed S. Abuelyaman, Sumita B. Mitra, Bradley D. Craig, Brian A. Shukla, David J. Plaut, Victoria A. Russell
  • Patent number: 8029286
    Abstract: The present invention is directed to dental compositions that can be used as adhesives for bonding a dental material to a dental structure surface and/or as a dental restorative material. The dental composition is preferably applied to a dental structure surface under conditions effective to etch the dental structure surface.
    Type: Grant
    Filed: September 19, 2008
    Date of Patent: October 4, 2011
    Assignee: 3M Innovative Properties Company
    Inventors: Bradley D. Craig, Steven M. Aasen, Ahmed S. Abuelyaman, David K. Cinader, Afshin Falsafi, Reinhold Hecht, Thomas Luchterhandt, Sumita B. Mitra, Prabhakara S. Rao, Brian A. Shukla, Markus Watermann
  • Publication number: 20110045444
    Abstract: Compositions comprising a hyperbranched compound and a polymer prepared from reactants comprising at least one (meth)acrylate monomer, and dental filling compositions comprising a hyperbranched compound.
    Type: Application
    Filed: April 16, 2009
    Publication date: February 24, 2011
    Inventors: Prabhakara S. Rao, Steven M. Aasen, Belma Erdogan-Haug, Babu N. Gaddam, Russel A. Roiko, Eugene G. Joseph
  • Publication number: 20110027760
    Abstract: Compositions comprising an acidic polymer compound and a (meth)acrylic copolymer prepared from reactants comprising at least one aliphatic, aromatic, or aralkyl (meth)acrylate monomer and at least one ethylenically unsaturated monomer having a polar group or a siloxane group, and dental filling compositions comprising the composition, and methods of using the compositions
    Type: Application
    Filed: April 6, 2009
    Publication date: February 3, 2011
    Inventors: Prabhakara S. Rao, Steven M. Aasen, Belma Erdogan-Haug, Russell A. Roiko, Eugene G. Joseph
  • Publication number: 20100254745
    Abstract: Ink formulation comprising liquid medium and colorant dispersed in the liquid medium wherein the liquid medium comprises an unsaturated resin derived from natural sources. Also, writing instruments containing such ink formulation.
    Type: Application
    Filed: April 1, 2010
    Publication date: October 7, 2010
    Inventor: Prabhakara S. RAO
  • Publication number: 20100233273
    Abstract: A polymer composition that includes a hydrophilic polymer, an optional secondary organic polymer, and a bioactive agent distributed therein, wherein the bioactive agent is selected from the group consisting of a silver compound, a copper compound, a zinc compound, and combinations thereof.
    Type: Application
    Filed: May 19, 2010
    Publication date: September 16, 2010
    Inventors: Scott A. Burton, Patrick D. Hyde, Prabhakara S. Rao, Caroline M. Ylitalo
  • Patent number: 7745509
    Abstract: A polymer composition that includes a hydrophilic polymer, an optional secondary organic polymer, and a bioactive agent distributed therein, wherein the bioactive agent is selected from the group consisting of a silver compound, a copper compound, a zinc compound, and combinations thereof.
    Type: Grant
    Filed: December 5, 2003
    Date of Patent: June 29, 2010
    Assignee: 3M Innovative Properties Company
    Inventors: Scott A. Burton, Patrick D. Hyde, Prabhakara S. Rao, Caroline M. Ylitalo
  • Patent number: 7699605
    Abstract: The present invention is directed to dental compositions that can be used as adhesives for bonding a dental material to a dental structure surface and/or as a dental restorative material. The dental composition is preferably applied to a dental structure surface under conditions effective to etch the dental structure surface.
    Type: Grant
    Filed: October 9, 2008
    Date of Patent: April 20, 2010
    Assignees: 3M Espe AG, 3M Innovative Properties Company
    Inventors: Steven M. Aasen, Ahmed S. Abuelyaman, David K. Cinader, Jr., Hendrik M. Grupp, Miriam Hansen, Thomas Klettke, Guenther Lechner, Kevin M. Lewandowski, Thomas Luchterhandt, Sumita B. Mitra, Prabhakara S. Rao, Victoria A. Russell, Michael S. Wendland
  • Publication number: 20100090157
    Abstract: An adhesive composition including an etchant for a hard tissue surface, at least one multifunctional crosslinkable (meth)acrylate monomer with a functionality greater than 4, and water. The adhesive composition is a water-in-oil emulsion.
    Type: Application
    Filed: December 17, 2007
    Publication date: April 15, 2010
    Inventors: Prabhakara S. Rao, Steven M. Aasen, Ahmed S. Abuelyaman, Sumita B. Mitra, Bradley D. Craig, Brian A. Shukla, David J. Plaut, Victoria A. Russell
  • Publication number: 20100080841
    Abstract: Fibrous articles having fibers coated with one or more polyelectrolyte layers are disclosed. Methods of making and using the fibrous articles are also disclosed.
    Type: Application
    Filed: April 18, 2008
    Publication date: April 1, 2010
    Inventors: Francis E. Porbeni, Moses M. David, Matthew T. Scholz, Prabhakara S. Rao
  • Patent number: 7632098
    Abstract: The present invention is directed to dental compositions that can be used as adhesives for bonding a dental material to a dental structure surface and/or as a dental restorative material. The dental composition is preferably applied to a dental structure surface under conditions effective to etch the dental structure surface.
    Type: Grant
    Filed: August 11, 2004
    Date of Patent: December 15, 2009
    Assignee: 3M Innovative Properties Company
    Inventors: Afshin Falsafi, Steven M. Aasen, Ahmed S. Abuelyaman, David K. Cinader, Bradley D. Craig, Reinhold Hecht, Thomas Luchterhandt, Sumita B. Mitra, Joel D. Oxman, Prabhakara S. Rao, Brian A. Shukla, Markus Watermann
  • Publication number: 20090035728
    Abstract: The present invention is directed to dental compositions that can be used as adhesives for bonding a dental material to a dental structure surface and/or as a dental restorative material. The dental composition is preferably applied to a dental structure surface under conditions effective to etch the dental structure surface.
    Type: Application
    Filed: October 9, 2008
    Publication date: February 5, 2009
    Inventors: Steven M. Aasen, Ahmed S. Abuelyaman, David K. Cinader, JR., Hendrik M. Grupp, Miriam Hansen, Thomas Klettke, Guenther Lechner, Kevin M. Lewandowski, Thomas Luchterhandt, Sumita B. Mitra, Prabhakara S. Rao, Victoria A. Russell, Michael S. Wendland
  • Publication number: 20090011388
    Abstract: The present invention is directed to dental compositions that can be used as adhesives for bonding a dental material to a dental structure surface and/or as a dental restorative material. The dental composition is preferably applied to a dental structure surface under conditions effective to etch the dental structure surface.
    Type: Application
    Filed: September 19, 2008
    Publication date: January 8, 2009
    Inventors: Bradley D. Craig, Steven M. Aasen, Ahmed S. Abuelyaman, David K. Cinader, Afshin Falsafi, Reinhold Hecht, Thomas Luchterhandt, Sumita B. Mitra, Prabhakara S. Rao, Brian A. Shukla, Markus Watermann
  • Patent number: 7452924
    Abstract: The present invention is directed to dental compositions that can be used as adhesives for bonding a dental material to a dental structure surface and/or as a dental restorative material. The dental composition is preferably applied to a dental structure surface under conditions effective to etch the dental structure surface.
    Type: Grant
    Filed: August 11, 2004
    Date of Patent: November 18, 2008
    Assignees: 3M Espe AG, 3M Innovative Properties Company
    Inventors: Steven M. Aasen, Ahmed S. Abuelyaman, Hendrik M. Grupp, Miriam Hansen, Thomas Klettke, Guenther Lechner, Kevin M. Lewandowski, Thomas Luchterhandt, Sumita B. Mitra, Prabhakara S. Rao, Victoria A. Russell, Michael S. Wendland
  • Patent number: 7449499
    Abstract: The present invention is directed to dental compositions that can be used as adhesives for bonding a dental material to a dental structure surface and/or as a dental restorative material. The dental composition is preferably applied to a dental structure surface under conditions effective to etch the dental structure surface.
    Type: Grant
    Filed: August 11, 2004
    Date of Patent: November 11, 2008
    Assignee: 3M Innovative Properties Company
    Inventors: Bradley D. Craig, Steven M Aasen, Ahmed S. Abuelyaman, Reinhold Hecht, Thomas Luchterhandt, Prabhakara S. Rao, Brian A. Shukla, Markus Watermann
  • Patent number: 5951749
    Abstract: Water-based pigmented inks are disclosed. Such inks are formed from water-based dispersions of pigment particles having novel dispersants therein. The dispersions are formed from the reaction product of an amino acid compound with a nitrogen reactive compound with subsequent hydrolysis providing the capability of the dispersant to hydrophobically interact with the pigment particles. The resultinginks are well-suited for use in ink jet and other printing applications.
    Type: Grant
    Filed: November 13, 1998
    Date of Patent: September 14, 1999
    Assignee: 3M Innovative Properties Company
    Inventors: Larry R. Krepski, Prabhakara S. Rao, Terrance P. Smith, Kenneth D. Wilson, Richard J. Kuo
  • Patent number: 5919866
    Abstract: The toner particles of this invention comprise pigment and a resin. The resin comprises a novel polymer formed from ethylenically unsaturated monomers, macromeric moieties that render the resin dispersible in hydrocarbon solvents, and a surface-release promoting moiety. When used for toner particles the polymer further comprises charge directing chelating moieties. The toner particles also include a charge director, preferably a metal cation. The toner particles, when dispersed in a carrier liquid, are useful as liquid toners for electrographic or electrophotographic processes.
    Type: Grant
    Filed: February 9, 1998
    Date of Patent: July 6, 1999
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Prabhakara S. Rao, Valdis Mikelsons
  • Patent number: 5840106
    Abstract: Water-based pigmented inks are disclosed. Such inks are formed from water-based dispersions of pigment particles having novel dispersants therein. The dispersions are formed from the reaction product of an alkenyl azlactone with an N-substituted amino acid compound. Subsequent to the reaction, the reaction product is ring-opened using an amine and, optionally, hydrolyzed. The resulting inks are well-suited for use in ink jet and other printing applications.
    Type: Grant
    Filed: November 13, 1995
    Date of Patent: November 24, 1998
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Larry R. Krepski, Richard J. Kuo, Prabhakara S. Rao, Terrance P. Smith
  • Patent number: 5753763
    Abstract: The toner particles of this invention comprise pigment and a resin. The resin comprises a novel polymer formed from ethylenically unsaturated monomers, macromeric moieties that render the resin dispersible in hydrocarbon solvents, and a surface-release promoting moiety. When used for toner particles the polymer further comprises charge directing chelating moieties. The toner particles also include a charge director, preferably a metal cation. The toner particles, when dispersed in a carrier liquid, are useful as liquid toners for electrographic or electrophotographic processes.
    Type: Grant
    Filed: October 30, 1996
    Date of Patent: May 19, 1998
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Prabhakara S. Rao, Valdis Mikelsons