Patents by Inventor Kok Chan

Kok Chan 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).

  • Publication number: 20240153917
    Abstract: Stacked microfeature devices and associated methods of manufacture are disclosed. A package in accordance with one embodiment includes first and second microfeature devices having corresponding first and second bond pad surfaces that face toward each other. First bond pads can be positioned at least proximate to the first bond pad surface and second bond pads can be positioned at least proximate to the second bond pad surface. A package connection site can provide electrical communication between the first microfeature device and components external to the package. A wirebond can be coupled between at least one of the first bond pads and the package connection site, and an electrically conductive link can be coupled between the first microfeature device and at least one of the second bond pads of the second microfeature device. Accordingly, the first microfeature device can form a portion of an electrical link to the second microfeature device.
    Type: Application
    Filed: January 12, 2024
    Publication date: May 9, 2024
    Inventors: Mung Suan Heng, Kok Chua Tan, Vince Chan Seng Leong, Mark S. Johnson
  • Publication number: 20120270351
    Abstract: A method of removal of a first and second sacrificial layer wherein an O2 plasma or an O2-containing environment is introduced to a cavity and a gap region through a plurality of via holes in a cavity capping material.
    Type: Application
    Filed: July 2, 2012
    Publication date: October 25, 2012
    Applicant: International Business Machines Corporation
    Inventors: Leena Paivikki BUCHWALTER, Kevin Kok CHAN, Timothy Joseph DALTON, Christopher Vincent JAHNES, Jennifer Louise LUND, Kevin Shawn PETRARCA, James Louis SPEIDELL, James Francis ZIEGLER
  • Patent number: 8269291
    Abstract: A microelectromechanical system (MEMS) resonator or filter including a first conductive layer, one or more electrodes patterned in the first conductive layer which serve the function of signal input, signal output, or DC biasing, or some combination of these functions, an evacuated cavity, a resonating member comprised of a lower conductive layer and an upper structural layer, a first air gap between the resonating member and one or more of the electrodes, an upper membrane covering the cavity, and a second air gap between the resonating member and the upper membrane.
    Type: Grant
    Filed: January 14, 2011
    Date of Patent: September 18, 2012
    Assignee: International Business Machines Corporation
    Inventors: Leena Paivikki Buchwalter, Kevin Kok Chan, Timothy Joseph Dalton, Christopher Vincent Jahnes, Jennifer Louise Lund, Kevin Shawn Petraraca, James Louis Speidell, James Francis Ziegler
  • Patent number: 7943412
    Abstract: A method of formation of a microelectromechanical system (MEMS) resonator or filter which is compatible with integration with any analog, digital, or mixed-signal integrated circuit (IC) process, after or concurrently with the formation of the metal interconnect layers in those processes, by virtue of its materials of composition, processing steps, and temperature of fabrication is presented. The MEMS resonator or filter incorporates a lower metal level, which forms the electrodes of the MEMS resonator or filter, that may be shared with any or none of the existing metal interconnect levels on the IC. It further incorporates a resonating member that is comprised of at least one metal layer for electrical connection and electrostatic actuation, and at least one dielectric layer for structural purposes. The gap between the electrodes and the resonating member is created by the deposition and subsequent removal of a sacrificial layer comprised of a carbon-based material.
    Type: Grant
    Filed: December 10, 2002
    Date of Patent: May 17, 2011
    Assignee: International Business Machines Corporation
    Inventors: Leena Paivikki Buchwalter, Kevin Kok Chan, Timothy Joseph Dalton, Christopher Vincent Jahnes, Jennifer Louise Lund, Kevin Shawn Petrarca, James Louis Speidell, James Francis Ziegler
  • Publication number: 20110109405
    Abstract: A microelectromechanical system (MEMS) resonator or filter including a first conductive layer, one or more electrodes patterned in the first conductive layer which serve the function of signal input, signal output, or DC biasing, or some combination of these functions, an evacuated cavity, a resonating member comprised of a lower conductive layer and an upper structural layer, a first air gap between the resonating member and one or more of the electrodes, an upper membrane covering the cavity, and a second air gap between the resonating member and the upper membrane.
    Type: Application
    Filed: January 14, 2011
    Publication date: May 12, 2011
    Applicant: International Business Machines Corporation
    Inventors: Leena Paivikki Buchwalter, Kevin Kok Chan, Timothy Joseph Dalton, Christopher Vincent Jahnes, Jennifer Louise Lund, Kevin Shawn Petrarca, James Louis Speidell, James Francis Ziegler
  • Patent number: 7741165
    Abstract: A structure and method of fabrication for MOSFET devices with a polycrystalline SiGe junction is disclosed. Ge is selectively grown on Si while Si is selectively grown on Ge. Alternating depositions of Ge and Si layers yield the SiGe junction. The deposited layers are doped, and subsequently the dopants outdiffused into the device body. A thin porous oxide layer between the polycrystalline Ge and Si layers enhances the isotropy of the SiGe junctions.
    Type: Grant
    Filed: May 12, 2008
    Date of Patent: June 22, 2010
    Assignee: International Business Machines Corporation
    Inventors: Kevin Kok Chan, Robert J. Miller, Erin C. Jones, Atul Ajmera
  • Publication number: 20090108381
    Abstract: A method of formation of a microelectromechanical system (MEMS) resonator or filter which is compatible with integration with any analog, digital, or mixed-signal integrated circuit (IC) process, after or concurrently with the formation of the metal interconnect layers in those processes, by virtue of its materials of composition, processing steps, and temperature of fabrication is presented. The MEMS resonator or filter incorporates a lower metal level, which forms the electrodes of the MEMS resonator or filter, that may be shared with any or none of the existing metal interconnect levels on the IC. It further incorporates a resonating member that is comprised of at least one metal layer for electrical connection and electrostatic actuation, and at least one dielectric layer for structural purposes. The gap between the electrodes and the resonating member is created by the deposition and subsequent removal of a sacrificial layer comprised of a carbon-based material.
    Type: Application
    Filed: December 10, 2002
    Publication date: April 30, 2009
    Applicant: International Business Machines Corporation
    Inventors: Leena Paivikki Buchwalter, Kevin Kok Chan, Timothy Joseph Dalton, Christopher Vincent Jahnes, Jennifer Louise Lund, Kevin Shawn Petrarca, James Louis Speidell, James Francis Ziegler
  • Publication number: 20080248635
    Abstract: A structure and method of fabrication for MOSFET devices with a polycrystalline SiGe junction is disclosed. Ge is selectively grown on Si while Si is selectively grown on Ge. Alternating depositions of Ge and Si layers yield the SiGe junction. The deposited layers are doped, and subsequently the dopants outdiffused into the device body. A thin porous oxide layer between the polycrystalline Ge and Si layers enhances the isotropy of the SiGe junctions.
    Type: Application
    Filed: May 12, 2008
    Publication date: October 9, 2008
    Applicant: International Business Machines Corporation
    Inventors: Kevin Kok Chan, Rober J. Miller, Erin C. Jones, Atul Ajmera
  • Patent number: 7387924
    Abstract: A structure and method of fabrication for MOSFET devices with a polycrystalline SiGe junction is disclosed. Ge is selectively grown on Si while Si is selectively grown on Ge. Alternating depositions of Ge and Si layers yield the SiGe junction. The deposited layers are doped, and subsequently the dopants outdiffused into the device body. A thin porous oxide layer between the polycrystalline Ge and Si layers enhances the isotropy of the SiGe junctions.
    Type: Grant
    Filed: September 18, 2006
    Date of Patent: June 17, 2008
    Assignee: International Business Machines Corporation
    Inventors: Kevin Kok Chan, Robert J. Miller, Erin C. Jones, Atul Ajmera
  • Publication number: 20070245414
    Abstract: Embodiments of proxy authentication and indirect certificate chaining are described herein. In an implementation, authentication for a client occurs via a proxy service. Proxy service communicates between client and server, and caches security tokens on behalf of the client. In an implementation, trustworthiness of certificate presented to a client to establish trust is determined utilizing a signed data package which incorporates a plurality of known certificates. The presented certificate is verified without utilizing root certificates installed on the client device.
    Type: Application
    Filed: April 14, 2006
    Publication date: October 18, 2007
    Applicant: Microsoft Corporation
    Inventors: Kok Chan, Colin Chow, Trevin Chow, Lin Huang, Naresh Jain, Wei Jiang, Yordan Rouskov, Pui-Yin Wong, Ismail Paya, Ryan Hurst
  • Publication number: 20070118875
    Abstract: An integrated authentication service is described which may receive a bundled request from one or more clients. One or more of the described techniques may be utilized to provide, in response to a single bundled request, a token for proof of identity and a certificate for establishing secure communications.
    Type: Application
    Filed: November 18, 2005
    Publication date: May 24, 2007
    Applicant: Microsoft Corporation
    Inventors: Trevin Chow, Winfred Wong, Yordan Rouskov, Kok Chan, Wei Jiang, Colin Chow, Sanjeev Nagvekar, Matt Sullivan, Kalyan Sayyaparaju, Dilip Pai, Avinash Belur
  • Patent number: 7183175
    Abstract: A structure, and a method for fabricating the structure, for the isolation of electronic devices is disclosed. The electronic devices are processed in substrates comprising a SiGe based layer underneath a strained Si layer. The isolation structure comprises a trench extending downward from the substrate top surface and penetrating into the SiGe based layer, forming a sidewall in the substrate. An epitaxial Si liner is selectively deposited onto the trench sidewall, and subsequently thermally oxidized. The trench is filled with a trench dielectric, which protrudes above the substrate top surface.
    Type: Grant
    Filed: July 1, 2005
    Date of Patent: February 27, 2007
    Assignee: International Business Machines Corporation
    Inventors: Steven John Koester, Klaus Dietrich Beyer, Michael John Hargrove, Kern Rim, Kevin Kok Chan
  • Patent number: 7169674
    Abstract: A diffusion barrier (and method for forming the diffusion barrier) for a field-effect transistor having a channel region and a gate electrode, includes an insulating material being disposed over the channel region. The insulating material includes nitrogen (N), and is disposed under the gate electrode. The insulating material can be provided either as a layer or distributed within a gate dielectric material disposed under the gate electrode.
    Type: Grant
    Filed: February 28, 2005
    Date of Patent: January 30, 2007
    Assignee: International Business Machines Corporation
    Inventors: Nestor Alexander Bojarczuk, Jr., Kevin Kok Chan, Christopher Peter D'Emic, Evgeni Gousev, Supratik Guha, Paul C. Jamison, Lars-Ake Ragnarsson
  • Patent number: 7135391
    Abstract: A structure and method of fabrication for MOSFET devices with a polycrystalline SiGe junction is disclosed. Ge is selectively grown on Si while Si is selectively grown on Ge. Alternating depositions of Ge and Si layers yield the SiGe junction. The deposited layers are doped, and subsequently the dopants outdiffused into the device body. A thin porous oxide layer between the polycrystalline Ge and Si layers enhances the isotropy of the SiGe junctions.
    Type: Grant
    Filed: May 21, 2004
    Date of Patent: November 14, 2006
    Assignee: International Business Machines Corporation
    Inventors: Kevin Kok Chan, Rober J. Miller, Erin C. Jones, Atul Ajmera
  • Patent number: 6987050
    Abstract: A method (and resulting structure) for fabricating a silicide for a semiconductor device, includes depositing a metal or an alloy thereof on a silicon substrate, reacting the metal or the alloy to form a first silicide phase, etching any unreacted metal, depositing a silicon cap layer over the first silicide phase, reacting the silicon cap layer to form a second silicide phase, for the semiconductor device, and etching any unreacted silicon. The substrate can be either a silicon-on-insulator (SOI) substrate or a bulk silicon substrate.
    Type: Grant
    Filed: July 11, 2001
    Date of Patent: January 17, 2006
    Assignee: International Business Machines Corporation
    Inventors: Cyril Cabral, Jr., Kevin Kok Chan, Guy Moshe Cohen, Christian Lavoie, Ronnen Andrew Roy, Paul Michael Solomon
  • Publication number: 20060007274
    Abstract: An embodiment of the invention provides a mechanism for controlling at least one ink transmission module, which controls a supply of ink using received control rotation. The mechanism includes an input, to receive control rotation. The mechanism also includes an output, to selectively transfer the control rotation to the ink transmission module. A control system is also provided to control the selective transfer of the output. The mechanism is moveable into a disengaged configuration by the control system, in which the output does not transfer rotation of the input to the ink transmission module, by a first predetermined sequence of rotations of the input, and into an engaged configuration, in which the output transfers rotation of the input to the ink transmission module, by a second predetermined sequence of rotations of the input.
    Type: Application
    Filed: July 9, 2004
    Publication date: January 12, 2006
    Inventors: Pui Huang, Seng Koh, Kok Chan, Wee Tan
  • Publication number: 20050234931
    Abstract: Method for providing an interface to a function that manages a plurality of entities. Computer-executable instructions receive a request to implement a change in configuration data. The configuration data is stored in a memory area and relates to an operation of one or more entities. In response to the received request, computer-executable instructions identify a plurality of the entities affected by the change and implement the change for the identified plurality of entities in accordance with the function.
    Type: Application
    Filed: April 6, 2004
    Publication date: October 20, 2005
    Inventors: Ying-Kin Yip, Kok Chan, Rui Chen, Rahul Newaskar, Anthony Toivonen
  • Publication number: 20050228998
    Abstract: A system and method for retrieving certificate of trust information for a certificate validation process. Fetching servers periodically retrieve certificate revocation lists (CRLs) from servers maintained by various certificate issuers. The revoked certificate data included in the retrieved CRLs are stored in a central database. An authentication server receives a request from a client for access to a secure service and initiates a validation process. The authentication server retrieves revoked certificate data from the central database and compares the retrieved revoked certificate data to certificate of trust information received from the client along with the request. The authentication server denies access to the secure information if the certificate of trust information matches revoked certificate data from the central database, allows access if the certificate of trust information does not match revoked certificate data from the central database.
    Type: Application
    Filed: April 2, 2004
    Publication date: October 13, 2005
    Inventors: Kok Chan, Wei Jiang, Wei-Quiang Guo
  • Publication number: 20050222891
    Abstract: A system and method for expanding recurring calendar events such that the retrieval of recurring calendar appointments is expedited. A recurring appointment is saved as a data structure including a recurrence pattern. When a recurring appointment is saved by a client that has sufficient processing and memory resources to perform the computations necessary to expand recurring appointments (i.e., a thick client), a background thread is notified. The background thread increases its priority to normal when idle processing capacity is available and calls a routine requesting calendar information for a defined time period. The routine causes the expansion of the data structure into the individual instances of the recurring appointment for a defined time period, and the individual instances are saved for later retrieval. A later query from a client without sufficient processing and memory resources to perform the calculations necessary to expand recurring appointments (i.e.
    Type: Application
    Filed: May 24, 2005
    Publication date: October 6, 2005
    Applicant: Microsoft Corporation
    Inventors: Kok Chan, Dennis Kiilerich
  • Publication number: 20050223216
    Abstract: A system and method for securely roaming private data from a first client computer to a second client computer linked via a communication network. A user of the first client computer executes a home client application and designates private data for roaming. The home client application generates a first key in response to a password, and encrypts the designated private data as a function of the first key. The server receives and stores the encrypted private data. A user of the second computer executes a roaming client application and requests transfer of the encrypted private data from the server. The roaming client application generates the first key in response to the password, and decrypts encrypted private data transferred from the server to obtain the private data. The invention further provides users the ability to retrieve encrypted private from the server even when the user cannot remember the password associated with the first key. Also, the server has no knowledge of the private data nor the keys.
    Type: Application
    Filed: April 2, 2004
    Publication date: October 6, 2005
    Inventors: Kok Chan, Dafina Toncheva, Baskaran Dharmarajan, Rahul Newaskar, Adam Back