Patents by Inventor Hemantha Kumar Wickramasinghe

Hemantha Kumar Wickramasinghe 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: 10280392
    Abstract: Methods and devices for non-thermal PCR amplification of nucleic acid sequences. An electrical potential is applied to cause non-thermal separation of strands of a double-stranded nucleic acid or double-stranded nucleic acid/primer extension product.
    Type: Grant
    Filed: February 8, 2016
    Date of Patent: May 7, 2019
    Assignee: The Regents of the University of California
    Inventor: Hemantha Kumar Wickramasinghe
  • Publication number: 20160230137
    Abstract: Methods and devices for non-thermal PCR amplification of nucleic acid sequences. An electrical potential is applied to cause non-thermal separation of strands of a double-stranded nucleic acid or double-stranded nucleic acid/primer extension product.
    Type: Application
    Filed: February 8, 2016
    Publication date: August 11, 2016
    Inventor: Hemantha Kumar Wickramasinghe
  • Patent number: 9255290
    Abstract: Methods and devices for non-thermal PCR amplification of nucleic acid sequences. An electrical potential is applied to cause non-thermal separation of strands of a double-stranded nucleic acid or double-stranded nucleic acid/primer extension product.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: February 9, 2016
    Assignee: The Regents of the University of California
    Inventor: Hemantha Kumar Wickramasinghe
  • Patent number: 8552414
    Abstract: An electronically scannable multiplexing device is capable of addressing multiple bits within a volatile or non-volatile memory cell. The multiplexing device generates an electronically scannable conducting channel with two oppositely formed depletion regions. The depletion width of each depletion region is controlled by a voltage applied to a respective control gate at each end of the multiplexing device. The present multi-bit addressing technique allows, for example, 10 to 100 bits of data to be accessed or addressed at a single node. The present invention can also be used to build a programmable nanoscale logic array or for randomly accessing a nanoscale sensor array.
    Type: Grant
    Filed: February 16, 2012
    Date of Patent: October 8, 2013
    Assignee: International Business Machines Corporation
    Inventors: Hemantha Kumar Wickramasinghe, Kailash Gopalakrishnan
  • Publication number: 20120140571
    Abstract: An electronically scannable multiplexing device is capable of addressing multiple bits within a volatile or non-volatile memory cell. The multiplexing device generates an electronically scannable conducting channel with two oppositely formed depletion regions. The depletion width of each depletion region is controlled by a voltage applied to a respective control gate at each end of the multiplexing device. The present multi-bit addressing technique allows, for example, 10 to 100 bits of data to be accessed or addressed at a single node. The present invention can also be used to build a programmable nanoscale logic array or for randomly accessing a nanoscale sensor array.
    Type: Application
    Filed: February 16, 2012
    Publication date: June 7, 2012
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Hemantha Kumar WICKRAMASINGHE, Kailash GOPALAKRISHNAN
  • Patent number: 8178362
    Abstract: An electronically scannable multiplexing device is capable of addressing multiple bits within a volatile or non-volatile memory cell. The multiplexing device generates an electronically scannable conducting channel with two oppositely formed depletion regions. The depletion width of each depletion region is controlled by a voltage applied to a respective control gate at each end of the multiplexing device. The present multi-bit addressing technique allows, for example, 10 to 100 bits of data to be accessed or addressed at a single node. The present invention can also be used to build a programmable nanoscale logic array or for randomly accessing a nanoscale sensor array.
    Type: Grant
    Filed: July 20, 2010
    Date of Patent: May 15, 2012
    Assignee: International Business Machines Corporation
    Inventors: Hemantha Kumar Wickramasinghe, Kailash Gopalakrishnan
  • Publication number: 20100284214
    Abstract: An electronically scannable multiplexing device is capable of addressing multiple bits within a volatile or non-volatile memory cell. The multiplexing device generates an electronically scannable conducting channel with two oppositely formed depletion regions. The depletion width of each depletion region is controlled by a voltage applied to a respective control gate at each end of the multiplexing device. The present multi-bit addressing technique allows, for example, 10 to 100 bits of data to be accessed or addressed at a single node. The present invention can also be used to build a programmable nanoscale logic array or for randomly accessing a nanoscale sensor array.
    Type: Application
    Filed: July 20, 2010
    Publication date: November 11, 2010
    Applicant: International Business Machines Corporation
    Inventors: HEMANTHA KUMAR WICKRAMASINGHE, Kailash Gopalakrishnan
  • Patent number: 7795044
    Abstract: An electronically scannable multiplexing device is capable of addressing multiple bits within a volatile or non-volatile memory cell. The multiplexing device generates an electronically scannable conducting channel with two oppositely formed depletion regions. The depletion width of each depletion region is controlled by a voltage applied to a respective control gate at each end of the multiplexing device. The present multi-bit addressing technique allows, for example, 10 to 100 bits of data to be accessed or addressed at a single node. The present invention can also be used to build a programmable nanoscale logic array or for randomly accessing a nanoscale sensor array.
    Type: Grant
    Filed: December 18, 2008
    Date of Patent: September 14, 2010
    Assignee: International Business Machines Corporation
    Inventors: Hemantha Kumar Wickramasinghe, Kailash Gopalakrishnan
  • Patent number: 7692244
    Abstract: An electronically scannable multiplexing device is capable of addressing multiple bits within a volatile or non-volatile memory cell. The multiplexing device generates an electronically scannable conducting channel with two oppositely formed depletion regions. The depletion width of each depletion region is controlled by a voltage applied to a respective control gate at each end of the multiplexing device. The present multi-bit addressing technique allows, for example, 10 to 100 bits of data to be accessed or addressed at a single node. The present invention can also be used to build a programmable nanoscale logic array or for randomly accessing a nanoscale sensor array.
    Type: Grant
    Filed: October 28, 2007
    Date of Patent: April 6, 2010
    Assignee: International Business Machines Corporation
    Inventors: Hemantha Kumar Wickramasinghe, Kailash Gopalakrishnan
  • Publication number: 20090102538
    Abstract: An electronically scannable multiplexing device is capable of addressing multiple bits within a volatile or non-volatile memory cell. The multiplexing device generates an electronically scannable conducting channel with two oppositely formed depletion regions. The depletion width of each depletion region is controlled by a voltage applied to a respective control gate at each end of the multiplexing device. The present multi-bit addressing technique allows, for example, 10 to 100 bits of data to be accessed or addressed at a single node. The present invention can also be used to build a programmable nanoscale logic array or for randomly accessing a nanoscale sensor array.
    Type: Application
    Filed: December 18, 2008
    Publication date: April 23, 2009
    Applicant: International Business Machines Corp.
    Inventors: Hemantha Kumar Wickramasinghe, Kailash Gopalakrishnan
  • Patent number: 7514327
    Abstract: An electronically scannable multiplexing device is capable of addressing multiple bits within a volatile or non-volatile memory cell. The multiplexing device generates an electronically scannable conducting channel with two oppositely formed depletion regions. The depletion width of each depletion region is controlled by a voltage applied to a respective control gate at each end of the multiplexing device. The present multi-bit addressing technique allows, for example, 10 to 100 bits of data to be accessed or addressed at a single node. The present invention can also be used to build a programmable nanoscale logic array or for randomly accessing a nanoscale sensor array.
    Type: Grant
    Filed: October 28, 2007
    Date of Patent: April 7, 2009
    Assignee: International Business Machines Corporation
    Inventors: Hemantha Kumar Wickramasinghe, Kailash Gopalakrishnan
  • Publication number: 20080251840
    Abstract: An electronically scannable multiplexing device is capable of addressing multiple bits within a volatile or non-volatile memory cell. The multiplexing device generates an electronically scannable conducting channel with two oppositely formed depletion regions. The depletion width of each depletion region is controlled by a voltage applied to a respective control gate at each end of the multiplexing device. The present multi-bit addressing technique allows, for example, 10 to 100 bits of data to be accessed or addressed at a single node. The present invention can also be used to build a programmable nanoscale logic array or for randomly accessing a nanoscale sensor array.
    Type: Application
    Filed: October 28, 2007
    Publication date: October 16, 2008
    Applicant: International Business Machines Corp.
    Inventors: HEMANTHA KUMAR WICKRAMASINGHE, Kailash Gopalakrishnan
  • Patent number: 7385234
    Abstract: A memory device or a logic device that uses an electronically scannable multiplexing device capable of addressing multiple bits within a volatile or non-volatile memory cell. The multiplexing device generates an electronically scannable conducting channel with two oppositely formed depletion regions. The depletion width of each depletion region is controlled by a voltage applied to a respective control gate at each end of the multiplexing device. The present multi-bit addressing technique allows, for example, 10 to 100 bits of data to be accessed or addressed at a single node. The present invention can also be used to build a programmable nanoscale logic array or for randomly accessing a nanoscale sensor array.
    Type: Grant
    Filed: April 27, 2005
    Date of Patent: June 10, 2008
    Assignee: International Business Machines Corporation
    Inventors: Kailash Gopalakrishnan, Hemantha Kumar Wickramasinghe
  • Patent number: 7352029
    Abstract: An electronically scannable multiplexing device is capable of addressing multiple bits within a volatile or non-volatile memory cell. The multiplexing device generates an electronically scannable conducting channel with two oppositely formed depletion regions. The depletion width of each depletion region is controlled by a voltage applied to a respective control gate at each end of the multiplexing device. The present multi-bit addressing technique allows, for example, 10 to 100 bits of data to be accessed or addressed at a single node. The present invention can also be used to build a programmable nanoscale logic array or for randomly accessing a nanoscale sensor array.
    Type: Grant
    Filed: April 27, 2005
    Date of Patent: April 1, 2008
    Assignee: International Business Machines Corporation
    Inventors: Hemantha Kumar Wickramasinghe, Kailash Gopalakrishnan
  • Patent number: 7262936
    Abstract: A heating device for a magnetic recording head includes first and second separating layers, the first separating layer having preferably a higher or equal thermal resistance than the first separating layer, and a heater formed between the first and second separating layers. A magnetic recording head for recording on magnetic medium includes a heating device which generates a heat spot on the magnetic medium which is larger than a magnetic track width, and/or heats a portion of the magnetic recording head which is on a leading edge side of a write gap in the magnetic recording head.
    Type: Grant
    Filed: March 1, 2004
    Date of Patent: August 28, 2007
    Assignee: Hitachi Global Storage Technologies Netherlands, B.V.
    Inventors: Hendrik F. Hamann, Prakash Kasiraj, Jeffrey S. Lille, Yves C. Martin, Chie Ching Poon, Neil Leslie Robertson, Jan-Ulrich Thiele, Hemantha Kumar Wickramasinghe
  • Patent number: 7133254
    Abstract: A magnetic recording disk drive has a magnetic recording head that includes first and second separating layers, and a heater formed between the first and second separating layers. The heater has a dimension such a thermal protrusion is induced in the recording head and a thermal conductance between the recording head and a recording medium is enhanced.
    Type: Grant
    Filed: May 30, 2003
    Date of Patent: November 7, 2006
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Hendrik F. Hamann, Chie Ching Poon, Michael P. Salo, Hemantha Kumar Wickramasinghe
  • Patent number: 6982843
    Abstract: The invention discloses an assembly comprising an adjustable heat flux mechanism suitable for thermally assisted information processing and control. In one embodiment, the assembly discloses a directed energy source for heating a media, a temperature sensing element for measuring/inferring the temperature of the media, and a controller for mutually positioning the energy output by the directed energy source and the media for thereby controlling the power directed to the media in accordance with the temperature sensing element.
    Type: Grant
    Filed: August 17, 2001
    Date of Patent: January 3, 2006
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Kevin Robert Coffey, Hendrik F. Hamann, Jan-Ulrich Thiele, Hemantha Kumar Wickramasinghe
  • Patent number: 6920088
    Abstract: The invention discloses an assembly capable of writing/erasing high-density data, preferably on a phase-change recording media. A preferred embodiment of the invention features a novel thermal near-field heater that may be employed in the assembly, preferably for writing in a substantially thermal near-field mode. The invention provides advantages of writing densities greater than that of diffraction limited systems, for example, writing densities of approximately greater than 100 Gbit/inch2, and writing speeds approximately greater than 100 MHz.
    Type: Grant
    Filed: January 31, 2001
    Date of Patent: July 19, 2005
    Assignee: International Business Machines Corporation
    Inventors: Hemantha Kumar Wickramasinghe, Hendrik F. Hamann, Yves Martin
  • Publication number: 20040240109
    Abstract: A magnetic recording disk drive has a magnetic recording head that includes first and second separating layers, and a heater formed between the first and second separating layers. The heater has a dimension such a thermal protrusion is induced in the recording head and a thermal conductance between the recording head and a recording medium is enhanced.
    Type: Application
    Filed: May 30, 2003
    Publication date: December 2, 2004
    Inventors: Hendrik F. Hamann, Chie Ching Poon, Michael P. Salo, Hemantha Kumar Wickramasinghe
  • Patent number: 6771445
    Abstract: An assembly for writing/reading high-density data on a recording media as a series of tags comprising a magnetic information bit pattern. The assembly includes an antenna positionable near the media; a source of electromagnetic radiation for producing an incident wave at least a portion of which can be coupled to the antenna; and, a means for coordinating a mutual positioning of the source of the electromagnetic radiation and the antenna, so that the antenna can generate a highly localized electromagnetic field in the vicinity of the media for inducing localized heating of the media. The assembly is capable of writing/erasing said high-density data by using an information signal for modulating the localized field generated in the vicinity of the media; the assembly is capable of reading by coordinating the mutual positioning of the antenna and the media.
    Type: Grant
    Filed: March 31, 2000
    Date of Patent: August 3, 2004
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Hendrik F. Hamann, Yves Martin, Hemantha Kumar Wickramasinghe