Patents by Inventor Chung-Jen Chien

Chung-Jen Chien 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: 20120017989
    Abstract: A method of texturing a metal provides a metal with a thickness of 50 to 400 ?m. The metal is anodized, etched and then textured in a first texturing step to produce a first textured surface of the metal. A textured metal is produced with a dimpled surface of dimples with diameters of 5 nm to 2 and a depth of from 2 nm to 2 ?m.
    Type: Application
    Filed: August 24, 2011
    Publication date: January 26, 2012
    Inventors: Pai-Chun Chang, Chung-Jen Chien, Pengfel Qi
  • Patent number: 6215701
    Abstract: A nonvolatile memory cell includes first and second MOS transistors, such as a PMOS transistor and NMOS transistor in a CMOS cell. One of the two transistors provides a floating gate for storing data while the other transistor is provided with a control gate for selecting the memory cell, and is connected with a bit line for reading data stored in the cell. The nonvolatile memory cell may be integrated into a logic device, such as a CMOS gate array, using PMOS and NMOS transistor cells formed in the gate array. In that case, the nonvolatile memory cell may be fabricated in a logic device with the standard processes used to produce the logic device.
    Type: Grant
    Filed: December 22, 1998
    Date of Patent: April 10, 2001
    Assignee: OKI Semiconductor
    Inventors: Chingchi Yao, Chung-Jen Chien
  • Patent number: 6201725
    Abstract: A nonvolatile memory cell includes first and second MOS transistors, such as a PMOS transistor and NMOS transistor in a CMOS cell. One of the two transistors provides a floating gate for storing data while the other transistor is provided with a control gate for selecting the memory cell, and is connected with a bit line for reading data stored in the cell. The nonvolatile memory cell may be integrated into a logic device, such as a CMOS gate array, using PMOS and NMOS transistor cells formed in the gate array. In that case, the nonvolatile memory cell may be fabricated in a logic device with the standard processes used to produce the logic device.
    Type: Grant
    Filed: June 12, 2000
    Date of Patent: March 13, 2001
    Assignee: Oki Semiconductor
    Inventors: Chingchi Yao, Chung-Jen Chien
  • Patent number: 6127710
    Abstract: A CMOS Structure is disclosed wherein two adjacent transistors of opposite conductivity each have a gate above their respective channel regions. Spacers are absent from the gate of one of the transistors. The structure is also characterized by lightly doped regions.
    Type: Grant
    Filed: July 25, 1997
    Date of Patent: October 3, 2000
    Assignee: Integrated Device Technology, Inc.
    Inventors: Jeong Yeol Choi, Chung-Jen Chien, Chung-Chyung Han, Chuen-Der Lien
  • Patent number: 6097048
    Abstract: A dynamic random access memory (DRAM) cell includes first and second MOS transistors, such as a PMOS transistor and NMOS transistor in a CMOS cell. One of the two transistors functions as a switch transistor while the other transistor is configured as a storage capacitor. The DRAM cell may be integrated into a logic device, such as a CMOS gate array, using PMOS and NMOS transistor cells formed in the gate array. In that case, the DRAM cell may be fabricated in a logic device with the standard processes used to produce the logic device.
    Type: Grant
    Filed: December 22, 1998
    Date of Patent: August 1, 2000
    Assignee: Oki Semiconductor
    Inventors: Chingchi Yao, Chung-Jen Chien, Thomas Chao
  • Patent number: 5888861
    Abstract: A process for manufacturing a BiCMOS integrated circuit is implemented by adapting the masking and doping steps used in forming CMOS devices. Thus simultaneous formation of both CMOS and bipolar device structures eliminates the need for any additional masking or process steps to form bipolar device structures. Collector regions 20 of NPN transistors are formed simultaneously with N-wells 18. Collector regions of PNP transistors, if required, are formed simultaneously with P-wells 16. Base regions 24 of the bipolar transistors are formed using threshold voltage implant steps and/or lightly doped drain implant steps of PMOS transistors. Emitter regions 59 are formed, when using a single polysilicon CMOS process, simultaneously with the CMOS gates 72, 74. When employing a double polysilicon CMOS process, the emitter regions 59 are formed concurrently with the second polysilicon layer interconnect structure and/or source/drain regions 50,52 of NMOS transistors.
    Type: Grant
    Filed: June 6, 1997
    Date of Patent: March 30, 1999
    Assignee: Integrated Device Technology, Inc.
    Inventors: Chung-Jen Chien, Jeong Y. Choi, Chuen-Der Lien
  • Patent number: 5793088
    Abstract: A method and structure for controlling the threshold voltage of a MOSFET is provided. The method compensates for the edge effect associated with prior art halo implants by providing an edge threshold voltage implant (the VT implant) which passes impurities through dielectric spacers, through the underlying source/drain regions and into the edges of the halo regions which lie in the channel. The VT implant reduces junction capacitance and does not degrade punchthrough voltage.
    Type: Grant
    Filed: June 18, 1996
    Date of Patent: August 11, 1998
    Assignee: Integrated Device Technology, Inc.
    Inventors: Jeong Yeol Choi, Chung-Jen Chien, Chung Chyung Han, Chuen-Der Lien
  • Patent number: 5750424
    Abstract: A process for fabricating a CMOS structure using a single masking step to define lightly-doped source and drain regions for both N- and P-channel devices. The process forms disposable spacers adjacent to gate structures and at least one retrograde well. Retrograde wells are formed using one or more charged ions at different energy levels. In addition, heavily-doped source and drain regions are formed using blanket implants of two different conductivities into a semiconductor substrate having two contiguous wells of opposite conductivity type. By blanket implanting a first dopant into both wells, and then selectively implanting a second dopant, the diffusion of the second dopant is partially suppressed by the first dopant. The partial suppression of first dopant results in shallow implants being formed. Also disclosed is a process for forming contact openings and contact implants.
    Type: Grant
    Filed: December 10, 1996
    Date of Patent: May 12, 1998
    Assignee: Integrated Device Technology, Inc.
    Inventors: Jeong Yeol Choi, Chung-Jen Chien, Chung-Chyung Han, Chuen-Der Lien
  • Patent number: 5654213
    Abstract: A process for fabricating a CMOS structure using a single masking step to define lightly-doped source and drain regions for both N- and P-channel devices. The process forms disposable spacers adjacent to gate structures and at least one retrograde well. Retrograde wells are formed using one or more charged ions at different energy levels. In addition, heavily-doped source and drain regions are formed using blanket implants of two different conductivities into a semiconductor substrate having two contiguous wells of opposite conductivity type. By blanket implanting a first dopant into both wells, and then selectively implanting a second dopant, the diffusion of the second dopant is partially suppressed by the first dopant. The partial suppression of first dopant results in shallow implants being formed. Also disclosed is a process for forming contact openings and contact implants.
    Type: Grant
    Filed: October 3, 1995
    Date of Patent: August 5, 1997
    Assignee: Integrated Device Technology, Inc.
    Inventors: Jeong Yeol Choi, Chung-Jen Chien, Chung-Chyung Han, Chuen-Der Lien