Patents by Inventor Pradnya V. Nagarkar

Pradnya V. Nagarkar 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).

  • Publication number: 20080085381
    Abstract: An optical element with a polarizer and a support layer is disclosed herein. The polarizer comprises an intrinsic polarizer and the support layer comprises the reaction product of: (a) from 50 to 99 parts by weight of a (meth)acryloyl oligomer having a plurality of pendant, free radically polymerizable functional groups and a Tg of greater than or equal to 20° C., (b) from 1 to 50 parts by weight of a free-radically polymerizable crosslinking agent and/or diluent monomer, and (c) from 0.001 to 5 parts by weight of an initiator. A method of forming the optical element is also disclosed herein. The optical element may be used in optical devices such as projector systems.
    Type: Application
    Filed: October 3, 2007
    Publication date: April 10, 2008
    Inventors: Gunnar H. Gunnarsson, David M. Snively, Xuequn Hu, Ying-Yuh Lu, Kevin M. Lewandowski, Joseph D. Rule, Pradnya V. Nagarkar
  • Patent number: 7351470
    Abstract: An antireflection film and method of making same includes a substrate having a first surface and a second surface, an inorganic layer deposited on the first surface of the substrate, and an optically active polymer layer formed by curing a curable composition in situ on the inorganic layer, the polymer layer having a refractive index not greater than about 1.53 over the wavelength range of 400 nm to 700 nm and a thickness of from about 20 nm to about 200 nm, and an adhesive layer deposited on the second surface of the substrate.
    Type: Grant
    Filed: April 29, 2002
    Date of Patent: April 1, 2008
    Assignee: 3M Innovative Properties Company
    Inventors: Erica J. Draheim, Bettie C. Fong, Bruce D. Kluge, Junkang J. Liu, Pradnya V. Nagarkar, William K. Smyth
  • Patent number: 7339736
    Abstract: A light polarizing film and method of making same includes a linear polarizer having a first surface and a second surface and having a polarization direction, an optical retarder comprising a simultaneously biaxially oriented polypropylene film disposed adjacent to the first surface of the linear polarizer and having an axis oriented at an angle with respect to the polarization direction, and an adhesive layer disposed between the first surface of the linear polarizer and the optical retarder and having a minimum adhesion strength of about 25 grams per inch.
    Type: Grant
    Filed: March 28, 2006
    Date of Patent: March 4, 2008
    Assignee: 3M Innovative Properties Company
    Inventors: Giorgio B. Trapani, Pradnya V. Nagarkar
  • Patent number: 7251075
    Abstract: An optical stack includes an intrinsic polarizer, such as a K-type or thin KE polarizer sheet. Optically functional coatings are disposed on one or both of the surfaces of the intrinsic polarizer. The optically functional coatings include a hardcoat, a transflector coating, a reflector coating, an antireflection film, a liquid crystal polymer retarder coating, a diffusion coating, an antiglare film, a wide view film, and an electrode. An optical stack including an intrinsic polarizer and an optically functional coating may have a thickness of less than 25 microns.
    Type: Grant
    Filed: September 18, 2006
    Date of Patent: July 31, 2007
    Assignee: 3M Innovative Properties Company
    Inventors: Giorgio Trapani, William K. Smyth, Pradnya V. Nagarkar
  • Patent number: 7110178
    Abstract: An optical stack includes an intrinsic polarizer, such as a K-type or thin KE polarizer sheet. Optically functional coatings are disposed on one or both of the surfaces of the intrinsic polarizer. The optically functional coatings include a hardcoat, a transflector coating, a reflector coating, an antireflection film, a liquid crystal polymer retarder coating, a diffusion coating, an antiglare film, a wide view film, and an electrode. An optical stack including an intrinsic polarizer and an optically functional coating may have a thickness of less than 25 microns.
    Type: Grant
    Filed: July 2, 2001
    Date of Patent: September 19, 2006
    Assignee: 3M Innovative Properties Company
    Inventors: Giorgio Trapani, William K. Smyth, Pradnya V. Nagarkar
  • Patent number: 7088511
    Abstract: A light polarizing film and method of making same includes a linear polarizer having a first surface and a second surface and having a polarization direction, an optical retarder comprising a simultaneously biaxially oriented polypropylene film disposed adjacent to the first surface of the linear polarizer and having an axis oriented at an angle with respect to the polarization direction, and an adhesive layer disposed between the first surface of the linear polarizer and the optical retarder and having a minimum adhesion strength of about 25 grams per inch.
    Type: Grant
    Filed: February 12, 2003
    Date of Patent: August 8, 2006
    Assignee: 3M Innovative Properties Company
    Inventors: Giorgio B. Trapani, Pradnya V. Nagarkar
  • Patent number: 6814899
    Abstract: An enhanced K-type polarizer includes a molecularly oriented sheet of polyvinylalcohol/polyvinylene block copolymer material having polyvinylene blocks formed by molecular dehydration of a sheet of polyvinylalcohol wherein the molecularly oriented sheet comprises light-polarizing molecules of polyvinylalcohol/polyvinylene block copolymer material varying in length, n, of conjugated repeating vinylene unit of the polyvinylene block, wherein an absorption concentration of each of the polyvinylene blocks in the range of n=19 to 25 is not less than approximately 65% of the absorption concentration of any of the polyvinylene blocks in the range of n=14 or 15, wherein the absorption concentration is determined by absorption of wavelengths from about 200 nm to about 700 nm by the polyvinylene blocks, and wherein the molecularly oriented sheet exhibits a photopic dichroic ratio, RD, of at least approximately 75.
    Type: Grant
    Filed: April 6, 2002
    Date of Patent: November 9, 2004
    Assignee: 3M Innovative Properties Company
    Inventors: John J. Cael, Jason W. Balich, Pradnya V. Nagarkar, Kim M. Vogel, Hassan Sahouani
  • Patent number: 6815056
    Abstract: An antireflection coating comprises one or more inorganic antireflection layers (typically metal oxide or silica layers) and a polymer layer cured in situ, the polymer layer having a refractive index not greater than about 1.53 over the wavelength range of 400 to 700 nm and a thickness of from about 20 to about 200 nm. The polymer layer provides good scratch and fingerprint protection, and also enables the thicknesses of the inorganic antireflection layers to be reduced, thereby reducing the cost of the coating.
    Type: Grant
    Filed: September 23, 2002
    Date of Patent: November 9, 2004
    Assignee: 3M Innovative Properties Company
    Inventors: Hyung-Chul Choi, Robert L. Jones, Pradnya V. Nagarkar, William K. Smyth, Xiaojia Z. Wang
  • Patent number: 6800378
    Abstract: An antireflection film and method of making same includes a substrate having a first surface and a second surface, the substrate being a circular polarizer, a linear polarizer, or a louvered plastic film, an inorganic layer deposited on the first surface of the substrate, and an optically active polymer layer formed by curing a curable composition in situ on the inorganic layer, the polymer layer having a refractive index not greater than about 1.53 over the wavelength range of 400 nm to 700 nm and a thickness of from about 20 nm to about 200 nm.
    Type: Grant
    Filed: October 14, 2002
    Date of Patent: October 5, 2004
    Assignee: 3M Innovative Properties Company
    Inventors: A. Nader Hawa, Georgio Trapani, Tiffany E. Lund, Richard G. Pawlak, Pradnya V. Nagarkar
  • Publication number: 20040156105
    Abstract: A light polarizing film and method of making same includes a linear polarizer having a first surface and a second surface and having a polarization direction, an optical retarder comprising a simultaneously biaxially oriented polypropylene film disposed adjacent to the first surface of the linear polarizer and having an axis oriented at an angle with respect to the polarization direction, and an adhesive layer disposed between the first surface of the linear polarizer and the optical retarder and having a minimum adhesion strength of about 25 grams per inch.
    Type: Application
    Filed: February 12, 2003
    Publication date: August 12, 2004
    Inventors: Giorgio B. Trapani, Pradnya V. Nagarkar
  • Patent number: 6689544
    Abstract: An ablatable laminar imaging medium useful in the manufacture of a substantially transparent electrode assembly is disclosed. The laminar imaging medium comprises a substrate, a high-index metal oxide layer, an ablatable metallic conductive layer, a high-index conductive metal oxide layer, and an ablation enhancement layer. The ablation enhancement layer has an IR-absorption greater than the IR-absorption of said high-index conductive metal oxide layer and an IR-reflectivity less than the IR-reflectivity of said high-index conductive metal oxide layer. Presence in the laminar imaging medium of the ablation enhancement layer lowers the exposure threshold of the medium and improves ablation accuracy, both—when occasioned in the manufacture of LCD electrode patterns—resulting collectively and ultimately in a more reliably formed electrical architecture, less susceptible to unwanted “shorting”.
    Type: Grant
    Filed: June 13, 2002
    Date of Patent: February 10, 2004
    Assignee: 3M Innovative Properties Company
    Inventors: Pradnya V. Nagarkar, James T. Richard, Linda S. Heath, Radha Sen, Jyothsna Ram
  • Patent number: 6632513
    Abstract: An article includes an antireflection composite material, a substrate, and an inorganic layer deposited onto the substrate. The inorganic layer has a thickness of from about 1 nm to about 10 nm. The article includes a polymer layer in contact with the inorganic layer to form an outer surface of the antireflection composite material. The polymer layer has a thickness of from about 70 nm to about 120 nm.
    Type: Grant
    Filed: May 15, 2000
    Date of Patent: October 14, 2003
    Assignee: 3M Innovative Properties Company
    Inventors: Hyung Chul Choi, Edward P. Lindholm, William K. Smyth, Pradnya V. Nagarkar
  • Publication number: 20030189275
    Abstract: A method for making an enhanced intrinsic polarizer from a polymeric sheet having an original length and comprising a hydroxylated linear high polymer includes stretching the polymeric sheet to a stretched length of from greater than 5.0 times to about 7.0 times the original length, introducing a suitable dehydration catalyst to the polymeric sheet, and heating the polymeric sheet and the catalyst to effect partial dehydration of the polymeric sheet wherein light absorbing, vinylene block segments are formed.
    Type: Application
    Filed: October 20, 2002
    Publication date: October 9, 2003
    Inventors: John J. Cael, Jason W. Balich, Pradnya V. Nagarkar, Kim M. Vogel, Hassan Sahouani
  • Publication number: 20030170478
    Abstract: An enhanced K-type polarizer includes a molecularly oriented sheet of polyvinylalcohol/polyvinylene block copolymer material having polyvinylene blocks formed by molecular dehydradation of a sheet of polyvinylalcohol wherein the molecularly oriented sheet comprises light-polarizing molecules of polyvinylalcohol/polyvinylene block copolymer material varying in length, n, conjugated repeating vinylene unit of the polyvinylene block, wherein in absorption concentration of each of the polyvinylene blocks in the range of n=19 to 25 is not less than approximately 65% of the absorption concentration of any of the polyvinylene blocks in the range of n=14 or 15, wherein the absorption concentration is determined by absorption of wavelengths from about 200 nm to about 700 nm by the polyvinylene blocks, and wherein the molecularly oriented sheet exhibits a photopic dichroic, RD, of at approximately 75.
    Type: Application
    Filed: April 6, 2002
    Publication date: September 11, 2003
    Inventors: John J. Cael, Jason W. Balich, Pradnya V. Nagarkar, Kim M. Vogel, Hassan Sahouani
  • Publication number: 20030116270
    Abstract: An antireflection film and method of making same includes a substrate having a first surface and a second surface, the substrate being a circular polarizer, a linear polarizer, or a louvered plastic film, an inorganic layer deposited on the first surface of the substrate, and an optically active polymer layer formed by curing a curable composition in situ on the inorganic layer, the polymer layer having a refractive index not greater than about 1.53 over the wavelength range of 400 nm to 700 nm and a thickness of from about 20 nm to about 200 nm.
    Type: Application
    Filed: October 14, 2002
    Publication date: June 26, 2003
    Inventors: A. Nader Hawa, Georgio Trapani, Tiffany E. Lund, Richard G. Pawlak, Pradnya V. Nagarkar
  • Publication number: 20030021972
    Abstract: An antireflection coating comprises one or more inorganic antireflection layers (typically metal oxide or silica layers) and a polymer layer cured in situ, the polymer layer having a refractive index not greater than about 1.53 over the wavelength range of 400 to 700 nm and a thickness of from about 20 to about 200 nm. The polymer layer provides good scratch and fingerprint protection, and also enables the thicknesses of the inorganic antireflection layers to be reduced, thereby reducing the cost of the coating.
    Type: Application
    Filed: September 23, 2002
    Publication date: January 30, 2003
    Inventors: Hyung-Chul Choi, Robert L. Jones, Pradnya V. Nagarkar, William K. Smyth, Xiaojia Z. Wang
  • Publication number: 20030012936
    Abstract: An antireflection film and method of making same includes a substrate having a first surface and a second surface, an inorganic layer deposited on the first surface of the substrate, and an optically active polymer layer formed by curing a curable composition in situ on the inorganic layer, the polymer layer having a refractive index not greater than about 1.53 over the wavelength range of 400 nm to 700 nm and a thickness of from about 20 nm to about 200 nm, and an adhesive layer deposited on the second surface of the substrate.
    Type: Application
    Filed: April 29, 2002
    Publication date: January 16, 2003
    Inventors: Erica J. Draheim, Bettie C. Fong, Bruce D. Kluge, Junkang J. Liu, Pradnya V. Nagarkar, William K. Smyth
  • Publication number: 20030002154
    Abstract: An optical stack includes an intrinsic polarizer, such as a K-type or thin KE polarizer sheet. Optically functional coatings are disposed on one or both of the surfaces of the intrinsic polarizer. The optically functional coatings include a hardcoat, a transflector coating, a reflector coating, an antireflection film, a liquid crystal polymer retarder coating, a diffusion coating, an antiglare film, a wide view film, and an electrode. An optical stack including an intrinsic polarizer and an optically functional coating may have a thickness of less than 25 microns.
    Type: Application
    Filed: July 2, 2001
    Publication date: January 2, 2003
    Inventors: Giorgio Trapani, William K. Smyth, Pradnya V. Nagarkar
  • Publication number: 20020195435
    Abstract: An ablatable laminar imaging medium useful in the manufacture of a substantially transparent electrode assembly is disclosed. The laminar imaging medium comprises a substrate, a high-index metal oxide layer, an ablatable metallic conductive layer, a high-index conductive metal oxide layer, and an ablation enhancement layer. The ablation enhancement layer has an IR-absorption greater than the IR-absorption of said high-index conductive metal oxide layer and an IR-reflectivity less than the IR-reflectivity of said high-index conductive metal oxide layer. Presence in the laminar imaging medium of the ablation enhancement layer lowers the exposure threshold of the medium and improves ablation accuracy, both—when occasioned in the manufacture of LCD electrode patterns—resulting collectively and ultimately in a more reliably formed electrical architecture, less susceptible to unwanted “shorting”.
    Type: Application
    Filed: June 13, 2002
    Publication date: December 26, 2002
    Inventors: Pradnya V. Nagarkar, James T. Richard, Linda S. Heath, Radha Sen, Jyothsna Ram
  • Patent number: 6485839
    Abstract: An ablatable laminar imaging medium useful in the manufacture of a substantially transparent electrode assembly is disclosed. The laminar imaging medium comprises a substrate, a high-index metal oxide layer, an ablatable metallic conductive layer, a high-index conductive metal oxide layer, and an ablation enhancement layer. The ablation enhancement layer has an IR-absorption greater than the IR-absorption of said high-index conductive metal oxide layer and an IR-reflectivity less than the IR-reflectivity of said high-index conductive metal oxide layer. Presence in the laminar imaging medium of the ablation enhancement layer lowers the exposure threshold of the medium and improves ablation accuracy, both—when occasioned in the manufacture of LCD electrode patterns—resulting collectively and ultimately in a more reliably formed electrical architecture, less susceptible to unwanted “shorting”.
    Type: Grant
    Filed: May 12, 2000
    Date of Patent: November 26, 2002
    Assignee: 3M Innovative Properties Company
    Inventors: Pradnya V. Nagarkar, James T. Richard, Linda S. Heath, Carl A. Chiulli, Radha Sen, Jyothsna Ram, David W. McCarthy