Patents by Inventor Subrata Dey

Subrata Dey 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: 8080871
    Abstract: One aspect of the invention includes a copper substrate; a catalyst on top of the copper substrate surface; and a thermal interface material that comprises a layer containing carbon nanotubes that contacts the catalyst. The carbon nanotubes are oriented substantially perpendicular to the surface of the copper substrate. A Raman spectrum of the layer containing carbon nanotubes has a D peak at ˜1350 cm?1 with an intensity ID, a G peak at ˜1585 cm?1 with an intensity IG, and an intensity ratio ID/IG of less than 0.7 at a laser excitation wavelength of 514 nm. The thermal interface material has: a bulk thermal resistance, a contact resistance at an interface between the thermal interface material and the copper substrate, and a contact resistance at an interface between the thermal interface material and a solid-state device. A summation of these resistances has a value of 0.06 cm2K/W or less.
    Type: Grant
    Filed: July 22, 2008
    Date of Patent: December 20, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Carlos Dangelo, Ephraim Suhir, Subrata Dey, Barbara Wacker, Yuan Xu, Arthur Boren, Darin Olsen, Yi Zhang, Peter Schwartz, Bala Padmakumar
  • Publication number: 20110103020
    Abstract: One aspect of the invention includes a copper substrate; a catalyst on top of the copper substrate surface; and a thermal interface material that comprises a layer containing carbon nanotubes that contacts the catalyst. The carbon nanotubes are oriented substantially perpendicular to the surface of the copper substrate. A Raman spectrum of the layer containing carbon nanotubes has a D peak at ˜1350 cm?1 with an intensity ID, a G peak at ˜1585 cm?1 with an intensity IG, and an intensity ratio ID/IG of less than 0.7 at a laser excitation wavelength of 514 nm. The thermal interface material has: a bulk thermal resistance, a contact resistance at an interface between the thermal interface material and the copper substrate, and a contact resistance at an interface between the thermal interface material and a solid-state device. A summation of these resistances has a value of 0.06 cm2K/W or less.
    Type: Application
    Filed: July 22, 2008
    Publication date: May 5, 2011
    Inventors: Carlos Dangelo, Ephraim Suhir, Subrata Dey, Barbara Wacker, Yuan Xu, Arthur Boren, Darin Olsen, Yi Zhang, Peter Schwartz, Bala Padmakumar
  • Publication number: 20080131655
    Abstract: Carbon nanotube-based structures and methods for removing heat from solid-state devices are disclosed. In one embodiment, a copper substrate has thermal interface materials on top of front and back surfaces of the copper substrate. Each thermal interface material (TIM) comprises a layer of carbon nanotubes and a filler material located between the carbon nanotubes. The summation of the thermal resistance of the copper substrate, the bulk thermal resistance of each TIM, the contact resistance between each TIM and the copper substrate, the contact resistance between one TIM and a solid-state device, and the contact resistance between the other TIM and a heat conducting surface has a value of 0.06 cm2K/W or less.
    Type: Application
    Filed: May 15, 2007
    Publication date: June 5, 2008
    Inventors: Barbara Wacker, Ephraim Suhir, Subrata Dey, Peter Schwartz, Rahim Kavari
  • Publication number: 20080131722
    Abstract: One embodiment includes: a copper substrate; a catalyst on top of a single surface of the copper substrate; and a thermal interface material on top of the single surface of the copper substrate. The thermal interface material comprises: a layer of carbon nanotubes that contacts the catalyst, and a filler material located between the carbon nanotubes. The carbon nanotubes are oriented substantially perpendicular to the single surface of the copper substrate. The thermal interface material has: a bulk thermal resistance, a contact resistance between the thermal interface material and the copper substrate, and a contact resistance between the thermal interface material and a solid-state device. The summation of the bulk thermal resistance, the contact resistance between the thermal interface material and the copper substrate, and the contact resistance between the thermal interface material and the solid-state device has a value of 0.06 cm2K/W or less.
    Type: Application
    Filed: May 15, 2007
    Publication date: June 5, 2008
    Inventors: Ephraim Suhir, Subrata Dey, Barbara Wacker, Peter Schwartz
  • Patent number: 6317297
    Abstract: A method and system for providing a magnetoresistive sensor is disclosed. The method and system include providing a first pinned layer, providing a first spacer layer above the first pinned layer, and providing a free layer above the first spacer layer. The method and system further include providing a second spacer layer above the free layer and providing a second pinned layer above the second spacer layer. The first pinned layer includes a first magnetic layer and a second magnetic layer separated by a first nonmagnetic layer. The first magnetic layer is antiferromagnetically coupled with the second magnetic layer. The second pinned layer includes a third magnetic layer and a fourth magnetic layer separated by a second nonmagnetic layer. The third magnetic layer is antiferromagnetically coupled with the fourth magnetic layer. The first pinned layer and the second pinned layer are pinned by a current carried by the magnetoresistive head during use.
    Type: Grant
    Filed: October 6, 1999
    Date of Patent: November 13, 2001
    Assignee: Read-Rite Corporation
    Inventors: Hua-Ching Tong, Xizeng Shi, Subrata Dey, Matthew Richard Gibbons
  • Patent number: 5930086
    Abstract: A recording element is provided for use in a high density thin film recording head. The recording element includes a substrate, a thermally conductive material in contact with the substrate, and an insulative layer in contact with the thermally conductive material. The recording element further includes a magneto-resistive element in contact with the insulative layer such that the magneto-resistive element fails to overlay the thermally conductive material. The thermally conductive material and the insulative layer have thermal conductivities sufficient to dissipate heat from the magneto-resistive element so that heat induced malfunctions of the recording element are minimized. The method for manufacturing the recording element is also provided.
    Type: Grant
    Filed: May 2, 1997
    Date of Patent: July 27, 1999
    Assignee: Storage Technology Corporation
    Inventors: Yi-Shung Chaug, Subrata Dey
  • Patent number: 5876614
    Abstract: The method of wet etching an aluminum oxide substrate deposits a thin layer of titanium film or chromium film on the aluminum oxide surface prior to the application of the photo-resist coating to form a barrier between the aluminum oxide and the photo-resist. This barrier layer inhibits the reaction between the aluminum oxide and the photo-resist during the photolithographic process. The undercutting of the aluminum oxide in the wet etching process is therefore controlled by the deposition of the barrier layer comprising the thin layer of titanium film or chromium film. The titanium film used is nominally 30 .ANG. thick to obtain the beneficial effects noted above while the chromium film would be approximately 1000 .ANG. thick.
    Type: Grant
    Filed: April 18, 1997
    Date of Patent: March 2, 1999
    Assignee: Storage Technology Corporation
    Inventors: Bo Zhou, Barry Allen McPherron, Subrata Dey, Yi-Shung Chaug
  • Patent number: 4882569
    Abstract: A presence-detection-system tag in which a frequency-dividing transponder may be decisively deactivated notwithstanding the intensity of the ambient magnetic field.
    Type: Grant
    Filed: July 26, 1988
    Date of Patent: November 21, 1989
    Assignee: Security Tag Systems, Inc.
    Inventor: Subrata Dey
  • Patent number: 4835028
    Abstract: A paper product includes both means for preventing images from being copied from the paper product by use of a xerographic photocopier; and means for enabling detection of the paper product when the paper product is transported through an interrogation zone of an article surveillance system.
    Type: Grant
    Filed: May 29, 1987
    Date of Patent: May 30, 1989
    Assignee: Security Tag Systems, Inc.
    Inventors: Subrata Dey, William R. Menyhert