Patents by Inventor Sriram Ramamoorthi

Sriram Ramamoorthi 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: 8084285
    Abstract: A method of forming a micro-electro mechanical system (MEMS), includes (1) removing material from a first wafer to define a first movable portion corresponding to an x-y accelerometer and a second movable portion corresponding to a z accelerometer, where each movable portion comprises at least one flexure member and at least one proof mass, each proof mass and flexure member being formed by the selective removal of material from a top side and a bottom side of first wafer; (2) bonding the first wafer to a second wafer comprising an electronic circuit, such that a gap is defined between the first wafer and the second wafer. The thickness of the at least one flexure member of the first movable portion is independent of a thickness of the at least one flexure member of the second movable portion and a thickness of the proof mass of the first movable portion is independent of a thickness of the at least one proof mass of the second movable portion.
    Type: Grant
    Filed: November 17, 2010
    Date of Patent: December 27, 2011
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Sriram Ramamoorthi, Donald J. Milligan
  • Publication number: 20110059566
    Abstract: A method of forming a micro-electro mechanical system (MEMS), includes (1) removing material from a first wafer to define a first movable portion corresponding to an x-y accelerometer and a second movable portion corresponding to a z accelerometer, where each movable portion comprises at least one flexure member and at least one proof mass, each proof mass and flexure member being formed by the selective removal of material from a top side and a bottom side of first wafer; (2) bonding the first wafer to a second wafer comprising an electronic circuit, such that a gap is defined between the first wafer and the second wafer. The thickness of the at least one flexure member of the first movable portion is independent of a thickness of the at least one flexure member of the second movable portion and a thickness of the proof mass of the first movable portion is independent of a thickness of the at least one proof mass of the second movable portion.
    Type: Application
    Filed: November 17, 2010
    Publication date: March 10, 2011
    Inventors: Sriram Ramamoorthi, Donald J. Milligan
  • Patent number: 7855151
    Abstract: A slot is formed that reaches through a first side of a silicon substrate to a second side of the silicon substrate. A trench is laser patterned. The trench has a mouth at the first side of the silicon substrate. The trench does not reach the second side of the silicon substrate. The trench is dry etched until a depth of at least a portion of the trench is extended approximately to the second side of the silicon substrate (12). A wet etch is performed to complete formation of the slot. The wet etch etches silicon from all surfaces of the trench.
    Type: Grant
    Filed: August 21, 2007
    Date of Patent: December 21, 2010
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Swaroop K. Kommera, Siddhartha Bhowmik, Richard J. Oram, Sriram Ramamoorthi, David M. Braun
  • Patent number: 7851876
    Abstract: Embodiments of a micro electro mechanical system are disclosed.
    Type: Grant
    Filed: October 20, 2006
    Date of Patent: December 14, 2010
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Sriram Ramamoorthi, Donald J. Milligan
  • Patent number: 7847368
    Abstract: This disclosure describes system(s) and/or method(s) enabling contacts for individual nanometer-scale-thickness layers of a multilayer film.
    Type: Grant
    Filed: April 16, 2008
    Date of Patent: December 7, 2010
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Paval Kornilovich, Peter Mardilovich, Sriram Ramamoorthi
  • Patent number: 7727820
    Abstract: This disclosure relates to misalignment-tolerant processes for fabricating multiplexing/demultiplexing architectures. One process enables fabricating a multiplexing/demultiplexing architecture at a tolerance greater than a pitch of conductive structures with which the architecture is capable of communicating. Another process can enable creation of address elements and conductive structures having substantially identical widths.
    Type: Grant
    Filed: April 30, 2004
    Date of Patent: June 1, 2010
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Xiaofeng Yang, Sriram Ramamoorthi, Galen H. Kawamoto
  • Patent number: 7683435
    Abstract: This disclosure relates to misalignment-tolerant multiplexing/demultiplexing architectures. One architecture enables communication with a conductive-structure array having a narrow spacing and pitch. Another architecture can comprise address elements having a width substantially identical to that of conductive-structures with which each of these address elements is capable of communicating. Another architecture can comprise rows of co-parallel address elements oriented obliquely relative to address lines and/or conductive structures.
    Type: Grant
    Filed: April 30, 2004
    Date of Patent: March 23, 2010
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Xiaofeng Yang, Sriram Ramamoorthi, Galen H. Kawamoto
  • Patent number: 7608998
    Abstract: A vacuum device, including a substrate and a support structure having a support perimeter, where the support structure is disposed over the substrate. In addition, the vacuum device also includes a non-evaporable getter layer having an exposed surface area. The non-evaporable getter layer is disposed over the support structure, and extends beyond the support perimeter, in at least one direction, of the support structure forming a vacuum gap between the substrate and the non-evaporable getter layer increasing the exposed surface area.
    Type: Grant
    Filed: March 22, 2006
    Date of Patent: October 27, 2009
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Sriram Ramamoorthi, Zhizhang Chen, John Liebeskind, Ronald L. Enck, Jennifer Shih
  • Publication number: 20090126977
    Abstract: This disclosure describes system(s) and/or method(s) enabling contacts for individual nanometer-scale-thickness layers of a multilayer film.
    Type: Application
    Filed: April 16, 2008
    Publication date: May 21, 2009
    Inventors: Paval Kornilovich, Peter Mardilovich, Sriram Ramamoorthi
  • Publication number: 20090053898
    Abstract: A slot is formed that reaches through a first side of a silicon substrate to a second side of the silicon substrate. A trench is laser patterned. The trench has a mouth at the first side of the silicon substrate. The trench does not reach the second side of the silicon substrate. The trench is dry etched until a depth of at least a portion of the trench is extended approximately to the second side of the silicon substrate (12). A wet etch is performed to complete formation of the slot. The wet etch etches silicon from all surfaces of the trench.
    Type: Application
    Filed: August 21, 2007
    Publication date: February 26, 2009
    Inventors: Swaroop K. Kommera, Siddhartha Bhowmik, Richard J. Oram, Sriram Ramamoorthi, David M. Braun
  • Patent number: 7494593
    Abstract: A method is disclosed for forming a single crystal cantilever and tip on a substrate. The method can include the operation of defining an implant area on the substrate with a layer of photoresist. A further operation can be implanting oxygen into the substrate in the implant area to a predetermined depth to form a buried oxide layer. The buried oxide layer can define a bottom of the single crystal cantilever and tip. Another operation can involve shaping the single crystal cantilever and tip from the substrate above the buried oxide layer.
    Type: Grant
    Filed: June 28, 2004
    Date of Patent: February 24, 2009
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Chien-Hua Chen, John Chen, Sriram Ramamoorthi
  • Patent number: 7460293
    Abstract: One embodiment of a display system includes a first array that defines multiple reflective devices each movable between an inactive position to reflect light to a light dump and an active position to reflect light to an imaging region, a second array that defines multiple reflective devices each movable between an inactive position to reflect light to the light dump and an active position to reflect light to the imaging region, and an activation device that projects an activation beam to the devices to move individual ones of the devices between the active position and the inactive position, wherein the first array, the second array and the activation device are housed within a single vacuum enclosure.
    Type: Grant
    Filed: September 30, 2005
    Date of Patent: December 2, 2008
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Timothy R Emery, George Radominski, Steve P. Hanson, Robert W. Shreeve, Alexander Govyadinov, Martha A. Truninger, Sriram Ramamoorthi, Harold Lee Van Nice
  • Patent number: 7413412
    Abstract: A vacuum micropump for use in a sealed package includes at least one pumping cell and a magnetic field proximate to the pumping cell. The pumping cell has at least one anode, at least one dielectric in contact with the at least one anode, at least one titanium cathode in contact with the dielectric and an electric field between the at least one anode and the at least one cathode. The dielectric defines a space between the at least one anode and the at least one cathode. The vacuum micropump may be used to gauge pressure within the sealed package. An appropriate method of use is also provided.
    Type: Grant
    Filed: June 28, 2004
    Date of Patent: August 19, 2008
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Alexander Govyandinov, Sriram Ramamoorthi
  • Patent number: 7375012
    Abstract: This disclosure describes system(s) and/or method(s) enabling contacts for individual nanometer-scale-thickness layers of a multilayer film.
    Type: Grant
    Filed: February 28, 2005
    Date of Patent: May 20, 2008
    Inventors: Pavel Kornilovich, Peter Mardilovich, Sriram Ramamoorthi
  • Publication number: 20080096301
    Abstract: Embodiments of a micro electro mechanical system are disclosed.
    Type: Application
    Filed: October 20, 2006
    Publication date: April 24, 2008
    Inventors: Sriram Ramamoorthi, Donald J. Milligan
  • Patent number: 7313945
    Abstract: A system for sensing a property of a fluid comprises a fluid channel operable to receive the fluid therein, a flexible arm having a free end positioned within at least a portion of the fluid channel, a fluid actuator disposed sufficiently close to the flexible arm such that actuation of the fluid actuator induces movement of the flexible arm when the fluid is present, and a deflection sensing system operable to quantifiably detect movement of the flexible arm.
    Type: Grant
    Filed: October 31, 2005
    Date of Patent: January 1, 2008
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Manish Giri, Mark Sanders Taylor, Sriram Ramamoorthi, Jeremy Harlan Donaldson, Joshua Yu, Mark D. Johnson
  • Publication number: 20070095129
    Abstract: A system for sensing a property of a fluid comprises a fluid channel operable to receive the fluid therein, a flexible arm having a free end positioned within at least a portion of the fluid channel, a fluid actuator disposed sufficiently close to the flexible arm such that actuation of the fluid actuator induces movement of the flexible arm when the fluid is present, and a deflection sensing system operable to quantifiably detect movement of the flexible arm.
    Type: Application
    Filed: October 31, 2005
    Publication date: May 3, 2007
    Inventors: Jeremy Donaldson, Manish Giri, Joshua Yu, Sriram Ramamoorthi, Mark Taylor, Mark Johnson
  • Publication number: 20070076176
    Abstract: One embodiment of a display system includes a first array that defines multiple reflective devices each movable between an inactive position to reflect light to a light dump and an active position to reflect light to an imaging region, a second array that defines multiple reflective devices each movable between an inactive position to reflect light to the light dump and an active position to reflect light to the imaging region, and an activation device that projects an activation beam to the devices to move individual ones of the devices between the active position and the inactive position, wherein the first array, the second array and the activation device are housed within a single vacuum enclosure.
    Type: Application
    Filed: September 30, 2005
    Publication date: April 5, 2007
    Inventors: Timothy Emery, George Radominski, Steve Hanson, Robert Shreeve, Alexander Govyadinov, Martha Truninger, Sriram Ramamoorthi, Harold Van Nice
  • Patent number: 7170666
    Abstract: An antireflection surface formed using a plurality of nanostructures of a first material on a surface of a second material. The first material is different from the second material. The distribution of spatial periods of the nanostructures is set by a self-assembly operation. The surface of the second material is converted to operate as a graded index surface that is substantially antireflective for the wavelength of interest.
    Type: Grant
    Filed: July 27, 2004
    Date of Patent: January 30, 2007
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Arthur Raymond Piehl, Sriram Ramamoorthi, Daniel C. Gardner
  • Patent number: 7158281
    Abstract: A MEMS device includes at least one movable member and an active device having at least one property affected by the location of the movable member with respect to the active device. A control circuit is used to limit movement of the movable member based on observation of the property affected by the active device.
    Type: Grant
    Filed: April 5, 2006
    Date of Patent: January 2, 2007
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Zhizhang Chen, Hang Liao, Sriram Ramamoorthi, Timothy F. Myers