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).
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Publication number: 20080085381Abstract: 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: ApplicationFiled: October 3, 2007Publication date: April 10, 2008Inventors: Gunnar H. Gunnarsson, David M. Snively, Xuequn Hu, Ying-Yuh Lu, Kevin M. Lewandowski, Joseph D. Rule, Pradnya V. Nagarkar
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Patent number: 7351470Abstract: 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: GrantFiled: April 29, 2002Date of Patent: April 1, 2008Assignee: 3M Innovative Properties CompanyInventors: Erica J. Draheim, Bettie C. Fong, Bruce D. Kluge, Junkang J. Liu, Pradnya V. Nagarkar, William K. Smyth
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Patent number: 7339736Abstract: 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: GrantFiled: March 28, 2006Date of Patent: March 4, 2008Assignee: 3M Innovative Properties CompanyInventors: Giorgio B. Trapani, Pradnya V. Nagarkar
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Patent number: 7251075Abstract: 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: GrantFiled: September 18, 2006Date of Patent: July 31, 2007Assignee: 3M Innovative Properties CompanyInventors: Giorgio Trapani, William K. Smyth, Pradnya V. Nagarkar
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Patent number: 7110178Abstract: 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: GrantFiled: July 2, 2001Date of Patent: September 19, 2006Assignee: 3M Innovative Properties CompanyInventors: Giorgio Trapani, William K. Smyth, Pradnya V. Nagarkar
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Patent number: 7088511Abstract: 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: GrantFiled: February 12, 2003Date of Patent: August 8, 2006Assignee: 3M Innovative Properties CompanyInventors: Giorgio B. Trapani, Pradnya V. Nagarkar
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Patent number: 6814899Abstract: 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: GrantFiled: April 6, 2002Date of Patent: November 9, 2004Assignee: 3M Innovative Properties CompanyInventors: John J. Cael, Jason W. Balich, Pradnya V. Nagarkar, Kim M. Vogel, Hassan Sahouani
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Patent number: 6815056Abstract: 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: GrantFiled: September 23, 2002Date of Patent: November 9, 2004Assignee: 3M Innovative Properties CompanyInventors: Hyung-Chul Choi, Robert L. Jones, Pradnya V. Nagarkar, William K. Smyth, Xiaojia Z. Wang
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Patent number: 6800378Abstract: 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: GrantFiled: October 14, 2002Date of Patent: October 5, 2004Assignee: 3M Innovative Properties CompanyInventors: A. Nader Hawa, Georgio Trapani, Tiffany E. Lund, Richard G. Pawlak, Pradnya V. Nagarkar
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Publication number: 20040156105Abstract: 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: ApplicationFiled: February 12, 2003Publication date: August 12, 2004Inventors: Giorgio B. Trapani, Pradnya V. Nagarkar
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Patent number: 6689544Abstract: 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: GrantFiled: June 13, 2002Date of Patent: February 10, 2004Assignee: 3M Innovative Properties CompanyInventors: Pradnya V. Nagarkar, James T. Richard, Linda S. Heath, Radha Sen, Jyothsna Ram
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Patent number: 6632513Abstract: 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: GrantFiled: May 15, 2000Date of Patent: October 14, 2003Assignee: 3M Innovative Properties CompanyInventors: Hyung Chul Choi, Edward P. Lindholm, William K. Smyth, Pradnya V. Nagarkar
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Publication number: 20030189275Abstract: 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: ApplicationFiled: October 20, 2002Publication date: October 9, 2003Inventors: John J. Cael, Jason W. Balich, Pradnya V. Nagarkar, Kim M. Vogel, Hassan Sahouani
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Publication number: 20030170478Abstract: 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: ApplicationFiled: April 6, 2002Publication date: September 11, 2003Inventors: John J. Cael, Jason W. Balich, Pradnya V. Nagarkar, Kim M. Vogel, Hassan Sahouani
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Publication number: 20030116270Abstract: 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: ApplicationFiled: October 14, 2002Publication date: June 26, 2003Inventors: A. Nader Hawa, Georgio Trapani, Tiffany E. Lund, Richard G. Pawlak, Pradnya V. Nagarkar
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Publication number: 20030021972Abstract: 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: ApplicationFiled: September 23, 2002Publication date: January 30, 2003Inventors: Hyung-Chul Choi, Robert L. Jones, Pradnya V. Nagarkar, William K. Smyth, Xiaojia Z. Wang
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Publication number: 20030012936Abstract: 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: ApplicationFiled: April 29, 2002Publication date: January 16, 2003Inventors: Erica J. Draheim, Bettie C. Fong, Bruce D. Kluge, Junkang J. Liu, Pradnya V. Nagarkar, William K. Smyth
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Publication number: 20030002154Abstract: 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: ApplicationFiled: July 2, 2001Publication date: January 2, 2003Inventors: Giorgio Trapani, William K. Smyth, Pradnya V. Nagarkar
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Publication number: 20020195435Abstract: 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: ApplicationFiled: June 13, 2002Publication date: December 26, 2002Inventors: Pradnya V. Nagarkar, James T. Richard, Linda S. Heath, Radha Sen, Jyothsna Ram
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Patent number: 6485839Abstract: 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: GrantFiled: May 12, 2000Date of Patent: November 26, 2002Assignee: 3M Innovative Properties CompanyInventors: Pradnya V. Nagarkar, James T. Richard, Linda S. Heath, Carl A. Chiulli, Radha Sen, Jyothsna Ram, David W. McCarthy