Patents by Inventor Xin Ping Cao

Xin Ping Cao 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: 10319728
    Abstract: In some examples, a fluid ejection device includes a substrate and a memory cell on the substrate, the memory cell including a first dielectric layer, a floating gate, a second dielectric layer, and a control gate. The memory cell includes a channel region between a drain region and a source region. The first dielectric layer is over the channel region and the floating gate is capacitively coupled to the channel region through the first dielectric layer. The floating gate includes a polysilicon layer, a metal layer, and a second dielectric layer between the polysilicon layer and the metal layer, where the second dielectric layer includes an opening through which the polysilicon layer is electrically connected to the metal layer.
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: June 11, 2019
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Chaw Sing Ho, Reynaldo V. Villavelez, Xin Ping Cao
  • Publication number: 20170092653
    Abstract: In some examples, a fluid ejection device includes a substrate and a memory cell on the substrate, the memory cell including a first dielectric layer, a floating gate, a second dielectric layer, and a control gate. The memory cell includes a channel region between a drain region and a source region. The first dielectric layer is over the channel region and the floating gate is capacitively coupled to the channel region through the first dielectric layer. The floating gate includes a polysilicon layer, a metal layer, and a second dielectric layer between the polysilicon layer and the metal layer, where the second dielectric layer includes an opening through which the polysilicon layer is electrically connected to the metal layer.
    Type: Application
    Filed: December 14, 2016
    Publication date: March 30, 2017
    Inventors: Chaw Sing Ho, Reynaldo V. Villavelez, Xin Ping Cao
  • Patent number: 9559106
    Abstract: A memory cell including a substrate, a first dielectric layer, a floating gate, a second dielectric layer, and a control gate. The substrate includes a channel region situated between a drain region and a source region. The first dielectric layer is situated over the channel region and the floating gate is capacitively coupled to the channel region through the first dielectric layer. The second dielectric layer is situated over the floating gate and the control gate is capacitively coupled to the floating gate through the second dielectric layer. A dielectric nitride layer is situated between the floating gate and the second dielectric layer to prevent charge loss from the floating gate to the second dielectric layer.
    Type: Grant
    Filed: October 31, 2012
    Date of Patent: January 31, 2017
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Chaw-Sing Ho, Reynaldo Villavelez, Xin Ping Cao
  • Publication number: 20150123186
    Abstract: A memory cell including a substrate, a first dielectric layer, a floating gate, a second dielectric layer, and a control gate. The substrate includes a channel region situated between a drain region and a source region. The first dielectric layer is situated over the channel region and the floating gate is capacitively coupled to the channel region through the first dielectric layer. The second dielectric layer is situated over the floating gate and the control gate is capacitively coupled to the floating gate through the second dielectric layer. A dielectric nitride layer is situated between the floating gate and the second dielectric layer to prevent charge loss from the floating gate to the second dielectric layer.
    Type: Application
    Filed: October 31, 2012
    Publication date: May 7, 2015
    Inventors: Chaw-Sing Ho, Reynaldo Villavelez, Xin Ping Cao
  • Patent number: 7999201
    Abstract: A Micro Electro Mechanical Systems (MEMS) G-switch includes one or more actuators formed between fixed driving stages and moveable driving stages. A proof mass is attached to the moveable driving stages and flexibly attached to a substrate through one or more spring members. A voltage control circuit applies working voltages to the driving stages. With a first working voltage applied between the moveable and the fixed driving stages, moving of the driving stages' sensing direction towards gravity at a first critical angle will cause moveable driving stages to collapse and touch the fixed driving stage on the substrate and thus turn on the MEMS G-switch. After turning on the G-switch, a second working voltage is applied and moving of the driving stages' sensing direction away from gravity at a second critical angle will cause moveable electrodes to deviate from the fixed electrodes and thus turn off the MEMS G-switch.
    Type: Grant
    Filed: November 6, 2008
    Date of Patent: August 16, 2011
    Assignee: Shandong Gettop Acoustic Co. Ltd.
    Inventors: Wang Zhe, Xin Ping Cao
  • Publication number: 20100108478
    Abstract: A Micro Electro Mechanical Systems (MEMS) G-switch includes one or more actuators formed between fixed driving stages and moveable driving stages. A proof mass is attached to the moveable driving stages and flexibly attached to a substrate through one or more spring members. A voltage control circuit applies working voltages to the driving stages. With a first working voltage applied between the moveable and the fixed driving stages, moving of the driving stages' sensing direction towards gravity at a first critical angle will cause moveable driving stages to collapse and touch the fixed driving stage on the substrate and thus turn on the MEMS G-switch. After turning on the G-switch, a second working voltage is applied and moving of the driving stages' sensing direction away from gravity at a second critical angle will cause moveable electrodes to deviate from the fixed electrodes and thus turn off the MEMS G-switch.
    Type: Application
    Filed: November 6, 2008
    Publication date: May 6, 2010
    Inventors: Wang Zhe, Xin Ping Cao