Patents by Inventor Bijay S. Saha

Bijay S. Saha 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: 8362627
    Abstract: Electronic devices and methods for fabricating electronic devices are described. One method includes providing a substrate with a die attach area, and forming a layer on the substrate outside of the die attach area. The layer may be formed from a fluoropolymer material. The method also includes coupling a die to the substrate in the die attach area, wherein a gap remains between the die and the die attach area. The method also includes placing an underfill material in the gap and adjacent to the layer on the substrate. Examples of fluoropolymer materials which may be used include polytetrafluoroethylene (PTFE) and perfluoroalkoxy polymer resin (PFA). Other embodiments are described and claimed.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: January 29, 2013
    Assignee: Intel Corporation
    Inventors: Shripad Gokhale, Kathy Wei Yan, Bijay S. Saha, Samir Pandey, Ngoc K. Dang, Munehiro Toyama
  • Publication number: 20110084388
    Abstract: Electronic devices and methods for fabricating electronic devices are described. One method includes providing a substrate with a die attach area, and forming a layer on the substrate outside of the die attach area. The layer may be formed from a fluoropolymer material. The method also includes coupling a die to the substrate in the die attach area, wherein a gap remains between the die and the die attach area. The method also includes placing an underfill material in the gap and adjacent to the layer on the substrate. Examples of fluoropolymer materials which may be used include polytetrafluoroethylene (PTFE) and perfluoroalkoxy polymer resin (PFA). Other embodiments are described and claimed.
    Type: Application
    Filed: December 20, 2010
    Publication date: April 14, 2011
    Inventors: Shripad GOKHALE, Kathy Wei YAN, Bijay S. SAHA, Samir PANDEY, Ngoc K. DANG, Munehiro TOYAMA
  • Patent number: 7875503
    Abstract: Electronic devices and methods for fabricating electronic devices are described. One method includes providing a substrate with a die attach area, and forming a layer on the substrate outside of the die attach area. The layer may be formed from a fluoropolymer material. The method also includes coupling a die to the substrate in the die attach area, wherein a gap remains between the die and the die attach area. The method also includes placing an underfill material in the gap and adjacent to the layer on the substrate. Examples of fluoropolymer materials which may be used include polytetrafluoroethylene (PTFE) and perfluoroalkoxy polymer resin (PFA). Other embodiments are described and claimed.
    Type: Grant
    Filed: December 28, 2006
    Date of Patent: January 25, 2011
    Assignee: Intel Corporation
    Inventors: Shripad Gokhale, Kathy Wei Yan, Bijay S. Saha, Samir Pandey, Ngoc K. Dang, Munehiro Toyama
  • Patent number: 7432202
    Abstract: A method includes forming a coating on a land contact of a package substrate, the coating including a first material disposed between a first layer and a second layer, each of the first layer and the second layer being made of a second material including gold. An apparatus includes a package substrate including a plurality of land contacts wherein each of the plurality of land contacts includes a coating including a first material disposed between a first layer and a second layer, each of the first layer and the second layer being made of a second material including gold.
    Type: Grant
    Filed: December 28, 2005
    Date of Patent: October 7, 2008
    Assignee: Intel Corporation
    Inventors: Bijay S. Saha, Munehiro Toyama, Ehab A. Nasir, Omar J. Bchir, Charavana K. Gurumurthy
  • Publication number: 20080157352
    Abstract: Electronic devices and methods for fabricating electronic devices are described. One method includes providing a substrate with a die attach area, and forming a layer on the substrate outside of the die attach area. The layer may be formed from a fluoropolymer material. The method also includes coupling a die to the substrate in the die attach area, wherein a gap remains between the die and the die attach area. The method also includes placing an underfill material in the gap and adjacent to the layer on the substrate. Examples of fluoropolymer materials which may be used include polytetrafluoroethylene (PTFE) and perfluoroalkoxy polymer resin (PFA). Other embodiments are described and claimed.
    Type: Application
    Filed: December 28, 2006
    Publication date: July 3, 2008
    Inventors: Shripad Gokhale, Kathy Wei Yan, Bijay S. Saha, Samir Pandey, Ngoc K. Dang, Munehiro Toyama
  • Patent number: 5512404
    Abstract: Carrier particles for an electrostatographic developer comprising a mixture of particles of a hard, magnetic ferrite material having a hexagonal crystalline structure of the general formula M0.6 Fe.sub.2 O.sub.3 in which M is strontium, barium or mixtures thereof exhibiting a coercivity of at least 300 Oersteds when magnetically saturated and an induced magnetic moment of at least 20 EMU/g when in an applied magnetic field of 1000 Oersteds in which from 1.0 to 10.0% by weight of the carrier particles in the mixture, based on the total weight of the mixture, have a number average particle diameter of from 1.0 to 10.0 micrometers and from 99.0 to 90.0% by weight of the carrier particles in the mixture, based on the total weight of the mixture, have a number average particle diameter of from 11.0 to 38.0 micrometers.The carrier particles provide developer compositions for magnetic brush development having high development speeds without the loss of copy image quality.
    Type: Grant
    Filed: August 29, 1994
    Date of Patent: April 30, 1996
    Assignee: Eastman Kodak Company
    Inventor: Bijay S. Saha
  • Patent number: 5500320
    Abstract: Carrier particles for an electrostatographic developer comprising particles of a hard, magnetic ferrite material having a hexagonal crystalline structure of the general formula MO.6 Fe.sub.2 O.sub.3 in which M is strontium, barium or mixtures thereof exhibiting a coercivity of at least 300 Oersteds when magnetically saturated and an induced magnetic moment of at least 20 EMU/g when in an applied magnetic field of 1000 Oersteds and having a number average particle diameter of from 10.0 to 38.0 micrometers.The carrier particles provide developer compositions for magnetic brush development having high development speeds without the loss of copy image quality.
    Type: Grant
    Filed: August 29, 1994
    Date of Patent: March 19, 1996
    Assignee: Eastman Kodak Company
    Inventor: Bijay S. Saha
  • Patent number: 5381219
    Abstract: The present invention relates to carrier particles which are used in image reproduction machines that include a magnetic brush for cleaning an imaging member. These carrier particles are utilized by the magnetic brush to clean the imaging member. The carrier particles include magnetic particles having a particle size distribution ranging from about 150 microns in diameter to about 1 micron in diameter. Preferably at least about 50% by weight of the magnetic particles have a diameter of less than about 45 microns. Preferably the carrier particles have an aspect ratio of about 8 and are made of stainless steel or iron.
    Type: Grant
    Filed: November 2, 1992
    Date of Patent: January 10, 1995
    Assignee: Eastman Kodak Company
    Inventors: Edward T. Miskinis, Orville C. Rodenberg, Bijay S. Saha
  • Patent number: 5332645
    Abstract: A method of manufacturing improved strontium or barium ferrite carrier particles for use in two-component electrographic developer compositions for the development of electrostatic charge patterns is provided in which the tendency toward early life dusting of the strontium or barium ferrites is reduced.Such strontium or barium ferrite carrier particles are obtained by (i) mixing unreacted particles of iron oxide and barium or strontium oxide or, alternatively, a salt of barium or strontium convertible to the corresponding oxide by heat upon subsequent firing in a mole ratio of iron oxide to the metal oxide or salt of exactly 5.95 to 6.0:1 with an organic binder and a polar solvent, preferably water, to form a slurry, (ii) spray drying the slurry to obtain green beads of substantially uniform particle size and substantially spherical shape, and (iii) firing the beads at a temperature of from 1150.degree. to 1175.degree. C.
    Type: Grant
    Filed: September 28, 1992
    Date of Patent: July 26, 1994
    Assignee: Eastman Kodak Company
    Inventors: Bijay S. Saha, James H. Anderson
  • Patent number: 5325161
    Abstract: A magnetic brush device for applying toner to an electrostatic image includes an applicator having a rotatable core. The sleeve for the core is made of an insulating material and preferably has a thin metallic coating on the outside of the sleeve defining the sleeve's outside surface.
    Type: Grant
    Filed: May 24, 1993
    Date of Patent: June 28, 1994
    Assignee: Eastman Kodak Company
    Inventors: Bijay S. Saha, Alec N. Mutz, James R. Flick, Thomas K. Hilbert
  • Patent number: 5306592
    Abstract: Carrier particles of substantially uniform particle size and substantially spherical shape comprising hard magnetic ferrite material having a single-phase hexagonal crystalline structure of the formula:MO.cndot.(Fe.sub.2 O.sub.3).sub.x (A)where M is strontium or barium and x is 5 to 6 suitable for magnetic brush development of electrostatic charge patterns and having a reduced tendency towards early life dusting, are prepared by:(i) mixing an aqueous solution containing strontium ions and iron (III) ions or barium ions and iron (III) ions in amounts sufficient to provide the strontium ferrite or barium ferrite of formula (A);(ii) reacting the mixture formed in step (i) with an alkaline aqueous ammonium hydroxide solution having an alkalinity of at least 0.
    Type: Grant
    Filed: October 29, 1992
    Date of Patent: April 26, 1994
    Assignee: Eastman Kodak Company
    Inventor: Bijay S. Saha
  • Patent number: 5268249
    Abstract: Carrier particles suitable for magnetic brush development comprising hard magnetic ferrite material having a single phase, W-type hexagonal crystalline structure represented by the formula MFe.sub.16 Me.sub.2 O.sub.27 where M is strontium or barium and Me is a divalent transition metal selected from the group consisting of nickel, cobalt, copper, zinc, manganese, magnesium, iron and mixtures thereof, exhibiting a coercivity of approximately 100 to 300 Oersteds when magnetically saturated and an induced magnetic moment of at least 60 EMU/g when in an applied magnetic field of 1000 Oersteds are disclosed. Also disclosed are electrostatic two-component dry developer compositions comprising charged toner particles mixed with oppositely charged carrier particles comprising the magnetically hard ferrite material described above and a method of developing an electrostatic charge pattern by contacting the charge pattern with a two-component dry developer composition described above.
    Type: Grant
    Filed: October 29, 1992
    Date of Patent: December 7, 1993
    Assignee: Eastman Kodak Company
    Inventors: Bijay S. Saha, Alec N. Mutz
  • Patent number: 5190841
    Abstract: Disclosed is an interdispersed two-phase ferrite composite which comprises, as a ferromagnetic phase, a magnetically hard ferrite material having a hexagonal crystalline structure of the general formula R.sub.x P.sub.(1-x) Fe.sub.12 O.sub.19 where R is selected from rare earth elements, P is selected from the group consisting of strontium, barium, lead, calcium and mixtures thereof and x has a value of from about 0.1 to about 0.4 exhibiting a coercivity of at least 300 Oersteds when magnetically saturated and an induced magnetic moment of at least 20 EMU/g when in an applied magnetic field of 1000 Oersteds and, as a ferroelectric phase, a ferroelectric material comprised of at least one of the double oxides of titanium, zirconium, tin, hafnium or germanium and either an alkaline earth or lead or cadmium, in which the mole ratio of the ferromagnetic phase to the ferroelectric phase is from about 1:1 to about 1:4.
    Type: Grant
    Filed: December 19, 1991
    Date of Patent: March 2, 1993
    Assignee: Eastman Kodak Company
    Inventors: Bijay S. Saha, Alec N. Mutz, Robert E. Zeman
  • Patent number: 5106714
    Abstract: Disclosed is an interdispersed two-phase ferrite composite which comprises about 0.1 mole to about 1.0 mole of a spinel phase having the general formula MFe.sub.2 O.sub.4 where M is at least one element that forms a spinel ferrite and is selected from the group consisting of cobalt, manganese, iron and mixtures thereof, to about 2.5 moles of a magnetoplumbite phase having the general formula PO.6Fe.sub.2 O.sub.3, where P is selected from the group consisting of stontium, barium, calcium, lead and mixtures thereof.Also disclosed are carrier particles formed from magnetized particles of the composite which optionally can be polymerically coated, an electrostatic two-component dry developer composition comprising charged toner particles mixed with oppositely charged carrier particles formed from magnetized, and optionally polymerically coated, particles of the composite, and a method of developing an electrostastic image by contacting the image with a two-component dry developer composition described above.
    Type: Grant
    Filed: August 1, 1990
    Date of Patent: April 21, 1992
    Assignee: Eastman Kodak Company
    Inventors: Bijay S. Saha, Alec N. Mutz, Robert E. Zeman
  • Patent number: 5104761
    Abstract: Disclosed is an interdispersed three-phase ferrite composite which comprises from about 0.1 mole to about 1.0 mole of a spinel phase having the general formula MFe.sub.2 O.sub.4 where M is at least one element that forms a spinel ferrite and is selected from the group consisting of cobalt, manganese, iron and mixtures thereof, to about 2.5 moles of a magnetoplumbite phase having the general formula PO.6Fe.sub.2 O.sub.3 where P is selected from the group consisting of strontium, barium, calcium, lead and mixtures thereof and, as a third phase, from about 0.02 to about 2.0 percent by weight, based on the combined weight of the spinel phase and the magnetoplumbite phase, of TiO.sub.2 or SiO.sub.2.
    Type: Grant
    Filed: September 14, 1990
    Date of Patent: April 14, 1992
    Assignee: Eastman Kodak Company
    Inventors: Bijay S. Saha, Alec N. Mutz, Robert E. Zeman
  • Patent number: 5061586
    Abstract: Disclosed are two-phase glass composite carrier particles which comprise a composite of a magnetically hard ferrite material having a single phase hexagonal crystalline structure of the formula MO.6Fe.sub.2 O.sub.3 where M is barium, strontium or lead exhibiting a coercivity of at least 300 Oersteds when magnetically saturated and an induced magnetic moment of at least 20 EMU/gm when in an applied field of 1000 Oersteds which is dispersed in a glass matrix comprised of from about 10 to 20 molar percent CuO, from about 10 to 40 molar percent BaO and from about 10 to 40 molar percent B.sub.2 O.sub.3 ; or a glass matrix comprised of from about 10 to 20 molar percent of V.sub.2 O.sub.5, from about 10 to 40 molar percent BaO and from about 10 to 40 molar percent B.sub.2 O.sub.3.Also disclosed is an electrostatic two-phase dry developer composition comprising charged toner particles mixed with oppositely charged carrier particles as described above.
    Type: Grant
    Filed: April 5, 1990
    Date of Patent: October 29, 1991
    Assignee: Eastman Kodak Company
    Inventors: Bijay S. Saha, Thomas A. Jadwin
  • Patent number: 4990876
    Abstract: A magnetic brush useful in an electrophotographic apparatus. An outer sleeve is made of non-magnetic metal. An inner core is disposed within the outer sleeve so as to permit relative rotation of the inner core and the outer sleeve. The inner core comprises a shaft, which is made of magnetic or non-magnetic metal, and a magnetic layer covering a generally cylindrical surface of the shaft. The magnetic layer consists essentially of a plasma-sprayed alloy of iron, a rare earth, and boron. The rare earth is selected from the group consisting of neodymium, praseodymium, and mixtures thereof. Neodymium is preferred. A bonding layer may be optionally provided, preferably an alloy of nickel, chromium, aluminum, and yttrium.
    Type: Grant
    Filed: September 15, 1989
    Date of Patent: February 5, 1991
    Assignee: Eastman Kodak Company
    Inventors: Ashok K. Agarwala, Bijay S. Saha
  • Patent number: 4855205
    Abstract: Disclosed is an interdispersed two-phase ferrite composite which comprises about 0.1 mole to about 1.0 mole of a spinel phase having the general formula MFe.sub.2 O.sub.4 where M is at least one element that forms a spinel ferrite, to about 2.5 moles of a magnetoplumbite phase having the general formula R.sub.x P.sub.1-x Fe.sub.12 O.sub.19 where R is selected from rare earth elements, P is selected from the group consisting of strontium, barium, calcium, lead, and mixtures thereof, and x has a value of from about 0.1 to about 0.4. Also disclosed is a carrier formed from magnetized and polymerically coated particles of the composite, a developer formed from a carrier and a toner, and a magnetic brush formed from a multiplicity of juxtaposed magnetically aligned hairs formed of the carrier.
    Type: Grant
    Filed: August 5, 1988
    Date of Patent: August 8, 1989
    Assignee: Eastman Kodak Company
    Inventors: Bijay S. Saha, Robert E. Zeman
  • Patent number: 4855206
    Abstract: Disclosed are carrier particles which comprise magnetically hard ferrite material having a single phase hexagonal crystal structure, and which contain neodymium, praseodymium, samarium, europium, or a mixture thereof, or a mixture of one or more of those elements with lanthanum. Also disclosed in an electrostatic two-component dry developer composition comprising charged toner particles mixed with oppositely charged carrier particles which comprise this hard ferrite material. A method for developing an electrostatic image by contacting the image with a two-component dry developer composition is also disclosed.
    Type: Grant
    Filed: August 5, 1988
    Date of Patent: August 8, 1989
    Assignee: Eastman Kodak Company
    Inventor: Bijay S. Saha
  • Patent number: 4764445
    Abstract: Hard ferrite magnetic carrier particles for use in two component developers together with toner particles for the development of electrostatic latent image patterns and containing from about 1 to about 5 percent by weight of lanthanum exhibit improved development efficiency.
    Type: Grant
    Filed: June 15, 1987
    Date of Patent: August 16, 1988
    Assignee: Eastman Kodak Company
    Inventors: Edward T. Miskinis, Bijay S. Saha