Patents by Inventor Praveen A. Chaudhari
Praveen A. Chaudhari 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: 20050041283Abstract: A molecular manipulator includes a light-sensitive molecule, including a double bond, which changes a cis-trans configuration of the double bond in response to illumination by light of a selected wavelength, and a probe, for example, a probe of a scanned-proximity probe microscope, to which the light-sensitive molecule is attached. A method of making the molecular manipulator includes covalently bonding the light-sensitive molecule to the probe. A method of moving a nanostructure includes controllably grasping, moving, and releasing the nanostructure with the molecular manipulator.Type: ApplicationFiled: August 19, 2003Publication date: February 24, 2005Applicant: International Business Machines CorporationInventors: Ali Afzali-Ardakani, Praveen Chaudhari
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Patent number: 6774463Abstract: In a Field Effect Transistor (FET) with a semiconductor channel the use of a high Tc oxide superconductor material in the gate electrode provides both control of parasitic resistance and capacitance and a proper work function when operated at a temperature below the Tc. The 1-2-3 compound oxide superconductors with the general formula Y1Ba2Cu3O7-y where y is approximately 0.1 have the ability in use in FET's to provide convenient work functions, low resistance and capacitance, and to withstand temperatures encountered in processing as the FET is being manufactured.Type: GrantFiled: February 24, 1992Date of Patent: August 10, 2004Assignee: International Business Machines CorporationInventors: Praveen Chaudhari, Richard Joseph Gambino, Eti Ganin, Roger Hilsen Koch, Lia Krusin-Elbaum, Robert Benjamin Laibowitz, George Anthony Sai-Halasz, Yuan-Chen Sun, Matthew Robert Wordeman
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Publication number: 20040151911Abstract: An apparatus for depositing and aligning an amorphous film in a single step, a method of forming an aligned film on a substrate in a single step by combining the deposition and alignment of an alignment layer into a single-step using ion beam processing and an amorphous film having an aligned atomic structure prepared by a method in which an aligned film is deposited and aligned in a single step are provided. The film is deposited and aligned in a single step by bombarding a substrate with an ion beam at a designated incident angle to simultaneously (a) deposit the film onto the substrate and (b) arrange an atomic structure of the film in at least one predetermined aligned direction.Type: ApplicationFiled: September 11, 2003Publication date: August 5, 2004Inventors: Alessandro Cesare Callegari, Praveen Chaudhari, James Patrick Doyle, Eileen Ann Galligan, Yoshimine Kato, James Andrew Lacey, Shui-Chih Alan Lien, Minhua Lu, Hiroki Nakano, Shuichi Odahara
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Publication number: 20040108047Abstract: The present invention provides a substrate having thereon a patterned small molecule organic semiconductor layer. The present invention also provides a method and a system for producing a substrate having thereon a patterned small molecule organic semiconductor layer. The substrate having thereon a patterned small molecule organic semiconductor layer is produced by exposing a donor substrate having thereon a small molecule organic semiconductor layer to energy to cause the thermal transfer of a small organic molecule onto an acceptor substrate.Type: ApplicationFiled: December 9, 2002Publication date: June 10, 2004Applicant: International Business Machines CorporationInventors: Ali Afzali-Ardakani, Hendrik F. Hamann, Praveen Chaudhari, Robert J. Von Gutfeld
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Publication number: 20040110093Abstract: The present invention provides a substrate having thereon a patterned small molecule organic semiconductor layer. The present invention also provides a method and a system for the production of the substrate having thereon a patterned small molecule organic semiconductor layer. The substrate with the patterned small molecule organic semiconductor layer is prepared by exposing a region of a substrate having thereon a film of a precursor of a small organic molecule to energy from an energy source to convert the film of a precursor of a small organic molecule to a patterned small molecule organic semiconductor layer.Type: ApplicationFiled: December 9, 2002Publication date: June 10, 2004Applicant: International Business Machines CorporationInventors: Ali Afzali-Ardakani, Hendrik F. Hamann, James A. Lacey, David R. Medeiros, Praveen Chaudhari, Robert J. Von Gutfeld
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Publication number: 20040105061Abstract: A liquid crystal display device includes an alignment layer with constituent materials. The constituent materials have a stoichiometric relationship configured to provide a given pretilt angle. Liquid crystal material is provided in contact with the alignment layer. A method for forming an alignment layer for liquid crystal displays includes forming the alignment layer on a substrate by introducing an amount of material to adjust a stoichiometric ratio of constituent materials wherein the amount is determined to provide a given pretilt angle to the alignment layer. Ions are directed at the alignment layer to provide uniformity of the pretilt angle.Type: ApplicationFiled: November 12, 2003Publication date: June 3, 2004Applicant: International Business Machines CorporationInventors: Paul S. Andry, Praveen Chaudhari, James P. Doyle, Eileen A. Galligan, James A. Lacey, Shui-Chih A. Lien, Minhua Lu
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Publication number: 20040086662Abstract: A method for preparing an alignment layer surface provides a surface on the alignment layer. The surface is bombarded with ions, and reactive gas is introduced to the ion beam to saturate dangling bonds on the surface. Another method for preparing an alignment layer surface provides a surface on the alignment layer. The surface is bombarded with ions and quenched with a reactive component to saturate dangling bonds on the surface.Type: ApplicationFiled: June 26, 2003Publication date: May 6, 2004Applicant: International Business Machines CorporationInventors: Alessandro C. Callegari, Praveen Chaudhari, Fuad E. Doany, James P. Doyle, Eileen A. Galligan, James H. Glownia, Gareth G. Hougham, James A. Lacey, Shui-Chih Lien, Minhua Lu, Alan E. Rosenbluth, Kei-Hsiung Yang
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Patent number: 6731361Abstract: Display panels and methods for fabrication are disclosed for an in-plane switching mode display to reduce or eliminate image sticking. The display panel includes a substrate with a first electrode formed on the substrate. A dielectric layer is formed on the substrate, and the dielectric layer forms an opening down to the first electrode so that the dielectric layer is eliminated over the first electrode. A second electrode is formed on the dielectric layer, and an alignment layer is formed on the first electrode, the second electrode and the dielectric layer.Type: GrantFiled: June 7, 2001Date of Patent: May 4, 2004Assignee: International Business Machines CorporationInventors: Paul S. Andry, Praveen Chaudhari, James P. Doyle, Eileen A. Galligan, Richard A. John, James A. Lacey, Shui-Chih A. Lien, Minhua Lu
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Patent number: 6724449Abstract: A liquid crystal display device includes a first substrate, a dry alignment film deposited over the substrate, a second substrate coupled to the first substrate with the dry alignment film deposited over the second substrate therebetween and forming a cell gap, and a liquid crystal material formed in the cell gap. The dry alignment film allows for a truly vertical alignment of molecules of the liquid crystal material such that the molecules form an angle of substantially 90° relative to the substrate. The dry alignment film can be an oxide layer, a nitride layer, an oxynitride layer or a silicon layer. This dry alignment layer can be treated to form a tilted homeotropic alignment, such that the liquid crystal molecules have a pretilt angle of 0.5 to 10 degrees from a substrate normal direction.Type: GrantFiled: March 27, 2000Date of Patent: April 20, 2004Assignee: International Business Machines CorporationInventors: Paul Stephen Andry, Chen Cai, Kevin Kok Chan, Praveen Chaudhari, James Patrick Doyle, Eileen Ann Galligan, Richard Allen John, James Andrew Lacey, Shui-Chih Alan Lien
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Patent number: 6682786Abstract: A liquid crystal display cell having liquid crystal molecules positioned in a vertical or a substantially vertical alignment is provided. The liquid crystal display cell includes at least two substantially homogeneous fluorinated alignment layers disposed on transparent electrodes; a liquid crystal layer of liquid crystal molecules disposed between the alignment layers; and, a means of applying voltage across the transparent electrodes. Methods for forming these liquid crystal display cells are also provided.Type: GrantFiled: December 7, 1999Date of Patent: January 27, 2004Assignee: IBM CorporationInventors: Shui-Chih Alan Lien, Alessandro C. Callegari, Paul S. Andry, Praveen Chaudhari, James A. Lacey, Sampath Purushothaman, James P. Doyle, Eileen A. Galligan, Richard A. John, John J. Ritsko, Yuhichi Momoi, Christopher Jahnes
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Patent number: 6665033Abstract: A method for preparing an alignment layer surface provides a surface on the alignment layer. The surface is bombarded with ions, and reactive gas is introduced to the ion beam to saturate dangling bonds on the surface. Another method for preparing an alignment layer surface provides a surface on the alignment layer. The surface is bombarded with ions and quenched with a reactive component to saturate dangling bonds on the surface.Type: GrantFiled: November 30, 2000Date of Patent: December 16, 2003Assignee: International Business Machines CorporationInventors: Alessandro C. Callegari, Praveen Chaudhari, Fuad E. Doany, James P. Doyle, Eileen A. Galligan, James H. Glownia, Gareth G. Hougham, James A. Lacey, Shui-Chih Lien, Minhua Lu, Alan E. Rosenbluth, Kei-Hsiung Yang
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Patent number: 6660341Abstract: A liquid crystal display device includes an alignment layer with constituent materials. The constituent materials have a stoichiometric relationship configured to provide a given pretilt angle. Liquid crystal material is provided in contact with the alignment layer. A method for forming an alignment layer for liquid crystal displays includes forming the alignment layer on a substrate by introducing an amount of material to adjust a stoichiometric ratio of constituent materials wherein the amount is determined to provide a given pretilt angle to the alignment layer. Ions are directed at the alignment layer to provide uniformity of the pretilt angle.Type: GrantFiled: June 7, 2001Date of Patent: December 9, 2003Assignee: International Business Machines CorporationInventors: Paul S. Andry, Praveen Chaudhari, James P. Doyle, Eileen A. Galligan, James A. Lacey, Shui-Chih A. Lien, Minhua Lu
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Patent number: 6654089Abstract: A self-alignment process for the precise alignment in a deposited diamond-like carbon (DLC), which results in a wider viewing angle for the display being manufactured. The process involves ion bombardment, which is swept across the liquid crystal panel in a two-pass process. In one embodiment, both ion sweeps are aligned at a 45-degree angle with respect to the bottom edge of the panel. The first pass is accomplished without any electrical bias on the panel. During the first pass the impinging ions may be at an angle with respect to a point on a plane defined by the surface of the panel that is less than 90 degrees. The second ion sweep is accomplished with the impinging ions at a second angle, greater than 90 degrees up to 180 degrees with respect to the point on the plane defined by the surface.Type: GrantFiled: May 3, 2001Date of Patent: November 25, 2003Assignee: International Business Machines CorporationInventors: Praveen Chaudhari, James P. Doyle, Shui-Chih Lien, Minhua Lu, James L. Speidell, Robert J. Von Gutfeld
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Publication number: 20030210371Abstract: A liquid crystal display system comprises a lamp providing illumination, a beam splitter for redirecting the illumination, and a light valve comprising an ion beam treated diamond like carbon inorganic film deposited over the substrate, wherein the inorganic film is patterned asymmetrically, having surface carbon atoms forming ridges for aligning liquid crystal, wherein the light valve reflects an illumination through the redirecting beam splitter. The system further comprises a violet-blocking long-pass filter positioned between the lamp and the beam splitter, and a short-pass trim filter positioned between the lamp and the beam splitter.Type: ApplicationFiled: May 7, 2002Publication date: November 13, 2003Applicant: International Business Machines CorporationInventors: Praveen Chaudhari, Fuad E. Doany, James P. Doyle, James H. Glownia, Minhua Lu, Alan E. Rosenbluth
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Patent number: 6632483Abstract: The present invention includes a method of forming an aligned film on a substrate. The film is deposited and aligned in a single step by a method comprising the step of bombarding a substrate with an ion beam at a designated incident angle to simultaneously (a) deposit the film onto the substrate and (b) arrange an atomic structure of the film in at least one predetermined aligned direction.Type: GrantFiled: June 30, 2000Date of Patent: October 14, 2003Assignee: International Business Machines CorporationInventors: Alessandro Cesare Callegari, Praveen Chaudhari, James Patrick Doyle, Eileen Ann Galligan, Yoshimine Kato, James Andrew Lacey, Shui-Chih Alan Lien, Minhua Lu, Hiroki Nakano, Shuichi Odahara
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Publication number: 20030142257Abstract: Multi-domain liquid crystal cells having twist angles less than 90 degrees, and LCDs containing such liquid crystal cells, are provided. Such liquid crystal cells are stable, particularly at zero and high fields, and provide wide viewing angles. Also provided are methods of using an adjustable particle beam in combination with a mask to generate multi-domains alignments. Such methods are useful for producing liquid crystal cells in general, and for producing the novel multi-domain low twist angle liquid crystal cells of the present invention in particular.Type: ApplicationFiled: January 28, 2002Publication date: July 31, 2003Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Praveen Chaudhari, James P. Doyle, Eileen A. Galligan, James A. Lacey, Shui-Chih Lien, Minhua Lu, Hiroki Nakano, Kei-Hsiung Yang
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Patent number: 6593586Abstract: A method is disclosed for forming an alignment layer for use in a liquid crystal cell layer for use in a liquid crystal cell using an ion beam source that includes the steps of: (1) providing a substrate having a surface; (2) providing an ion beam source that emanates an ion beam; (3) providing a mask layer disposed between the substrate surface and the ion beam source. The mask layer has at least two openings disposed between the ion beam source and the substrate surface. The shape and position of the openings reduce the irregularity of the beam exposure in a border region on the surface of the substrate resulting from the ion beam source. The present invention may be used in conjunction with substrate treatment using multiple sweeps with a single ion beam source, or with a substrate treatment using a single sweep with multiple ion beam sources. Also disclosed is an apparatus for practicing the disclosed method.Type: GrantFiled: August 16, 2001Date of Patent: July 15, 2003Assignee: International Business Machines CorporationInventors: Praveen Chaudhari, Eileen Ann Galligan, James Patrick Doyle, James Andrew Lacey, Shui-Chih Alan Lien, Hiroki Nakano, Minhua Lu
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Patent number: 6583847Abstract: It is important to accurately align a pair of substrates, such as liquid crystal display (LCD) panels before they are affixed together. This is accomplished, according to the invention, by depositing a number of magnetic field generating elements on one substrate and a plurality of magnetic field-detecting elements on the other substrate. For example, the field-generating elements can be permanent magnets, while the field-detecting can be correspondingly located elements of a magnetic material. Alternatively, both the field-generating and field-detecting elements may be made from permanently magnetic materials.Type: GrantFiled: June 18, 2001Date of Patent: June 24, 2003Assignee: International Business Machines CorporationInventors: Alessandro C. Callegari, Praveen Chaudhari, James P. Doyle, Eileen A. Galligan, James A. Lacey, Shui-Chih Alan Lien, Sampath Purushothaman, John J. Ritsko, James J. Speidell
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Patent number: 6577365Abstract: Disclosed is a method for forming an alignment layer for use in a liquid crystal display cell. The present invention includes a method of determining ion beam source operation parameters to provide a twist angle that is less than a predetermined maximum twist angle. The present invention also discloses a method for forming an improved liquid crystal display cell and an improved liquid crystal display.Type: GrantFiled: April 14, 2000Date of Patent: June 10, 2003Assignee: International Business Machines CorporationInventors: Praveen A. Chaudhari, Eileen Ann Galligan, James Patrick Doyle, James Andrew Lacey, Shui-Chih Alan Lien, Hiro Nakano
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Publication number: 20020191143Abstract: It is important to accurately align a pair of substrates, such as liquid crystal display (LCD) panels before they are affixed together. This is accomplished, according to the invention, by depositing a number of field generating elements on one substrates and a corresponding plurality of field-detecting elements on the other substrate. For example, the field-generating elements can be permanent magnets, while the field-detecting can be correspondingly located elements of a magnetic material. Alternatively, both the field-generating and field-detecting elements may be formed from a high surface tension material, such as solder having a melting point above room temperature.Type: ApplicationFiled: June 18, 2001Publication date: December 19, 2002Applicant: International Business Machines CorporationInventors: Alessandro C. Callegari, Praveen Chaudhari, James P. Doyle, Eileen A. Galligan, James A. Lacey, Shui-Chih Alan Lien, Sampath Purushothaman, John J. Ritsko, James L. Speidell