Patents by Inventor Manju Sarkar

Manju Sarkar 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: 20140005688
    Abstract: Hair removing device (200) comprising a base member (301) having two elongate arms (302) extending outwardly while maintaining a spacing (310) in between. Two elongate flexible elements (311) form a twined section (304) between their first and second ends (303), (305) that are secured to the two arms (302). The twined section (304) is positioned in the spacing (310), under a tension. A movable member (306) extends outwardly from the base member (301) and is movable relative to the base member (301) in forward and reverse strokes. The movable member (306) urges the twined section (304) to move forward during the forward stroke and releases the twined section (304) to resiliently retract during the reverse stroke. The twined section (304) can engage and uproot hair (314) during the forward stroke.
    Type: Application
    Filed: March 25, 2011
    Publication date: January 2, 2014
    Inventor: Manju Sarkar
  • Patent number: 8450832
    Abstract: Large tuning range junction varactor includes first and second junction capacitors coupled in parallel between first and second varactor terminals. First and second plates of the capacitors are formed by three alternating doped regions in a substrate. The first and third doped regions are of the same type sandwiching the second doped region of the second type. A first input terminal is coupled to the first and third doped regions and a second terminal is coupled to the second doped region. At the interfaces of the doped regions are first and second depletion regions whose width can be varied by varying the voltage across the terminals from zero to full reverse bias.
    Type: Grant
    Filed: April 5, 2007
    Date of Patent: May 28, 2013
    Assignee: GLOBALFOUNDRIES Singapore Pte. Ltd.
    Inventors: Manju Sarkar, Purakh Raj Verma
  • Patent number: 7994563
    Abstract: A device is presented. The device includes a substrate with a first well of a first polarity type. The first well defines a varactor region and comprises a lower first well boundary located above a bottom surface of the substrate. A second well in the varactor region is also included in the device. The second well comprises a buried well of a second polarity type having an upper second well boundary disposed below an upper portion of the first well from an upper first well boundary to the upper second well boundary and a lower second well boundary disposed above the lower first well boundary, wherein an interface of the second well and the upper portion of the first well forms a shallow PN junction in the varactor region. The device also includes a gate structure in the varactor region. The upper portion of the first well beneath the gate structure forms a channel region of the device.
    Type: Grant
    Filed: November 11, 2009
    Date of Patent: August 9, 2011
    Assignee: Global Foudries Singapore PTE. Ltd.
    Inventors: Manju Sarkar, Purakh Raj Verma
  • Patent number: 7952131
    Abstract: Large tuning range junction varactor includes first and second junction capacitors coupled in parallel between first and second varactor terminals. First and second plates of the capacitors are formed by three alternating doped regions in a substrate. The second and third doped regions are of the same type sandwiching the first doped region of the second type. A first varactor terminal is coupled to the second and third doped regions and a second varactor terminal is coupled to the first doped region. At the interfaces of the doped regions are first and second depletion regions, the widths of which can be varied by varying the voltage across the terminals from zero to full reverse bias. At zero bias condition, junction capacitance (Cmax) is enhanced due to summation of two junction capacitances in parallel. At reverse bias condition, with the merging of the two junction depletion widths, the capacitor areas are drastically reduced, thereby reducing Cmin significantly.
    Type: Grant
    Filed: June 21, 2010
    Date of Patent: May 31, 2011
    Assignee: Chartered Semiconductor Manufacturing, Ltd.
    Inventor: Manju Sarkar
  • Publication number: 20100258910
    Abstract: Large tuning range junction varactor includes first and second junction capacitors coupled in parallel between first and second varactor terminals. First and second plates of the capacitors are formed by three alternating doped regions in a substrate. The second and third doped regions are of the same type sandwiching the first doped region of the second type. A first varactor terminal is coupled to the second and third doped regions and a second varactor terminal is coupled to the first doped region. At the interfaces of the doped regions are first and second depletion regions, the widths of which can be varied by varying the voltage across the terminals from zero to full reverse bias. At zero bias condition, junction capacitance (Cmax) is enhanced due to summation of two junction capacitances in parallel. At reverse bias condition, with the merging of the two junction depletion widths, the capacitor areas are drastically reduced, thereby reducing Cmin significantly.
    Type: Application
    Filed: June 21, 2010
    Publication date: October 14, 2010
    Applicant: GLOBALFOUNDRIES SINGAPORE PTE. LTD.
    Inventor: Manju Sarkar
  • Patent number: 7741187
    Abstract: Large tuning range junction varactor includes first and second junction capacitors coupled in parallel between first and second varactor terminals. First and second plates of the capacitors are formed by three alternating doped regions in a substrate. The second and third doped regions are of the same type sandwiching the first doped region of the second type. A first varactor terminal is coupled to the second and third doped regions and a second varactor terminal is coupled to the first doped region. At the interfaces of the doped regions are first and second depletion regions, the widths of which can be varied by varying the voltage across the terminals from zero to full reverse bias. At zero bias condition, junction capacitance (Cmax) is enhanced due to summation of two junction capacitances in parallel. At reverse bias condition, with the merging of the two junction depletion widths, the capacitor areas are drastically reduced, thereby reducing Cmin significantly.
    Type: Grant
    Filed: September 20, 2007
    Date of Patent: June 22, 2010
    Assignee: Chartered Semiconductor Manufacturing, Ltd.
    Inventor: Manju Sarkar
  • Publication number: 20100117133
    Abstract: A device is presented. The device includes a substrate with a first well of a first polarity type. The first well defines a varactor region and comprises a lower first well boundary located above a bottom surface of the substrate. A second well in the varactor region is also included in the device. The second well comprises a buried well of a second polarity type having an upper second well boundary disposed below an upper portion of the first well from an upper first well boundary to the upper second well boundary and a lower second well boundary disposed above the lower first well boundary, wherein an interface of the second well and the upper portion of the first well forms a shallow PN junction in the varactor region. The device also includes a gate structure in the varactor region. The upper portion of the first well beneath the gate structure forms a channel region of the device.
    Type: Application
    Filed: November 11, 2009
    Publication date: May 13, 2010
    Applicant: CHARTERED SEMICONDUCTOR MANUFACTURING, LTD.
    Inventors: Manju SARKAR, Purakh Raj VERMA
  • Patent number: 7618873
    Abstract: A MOS varactor includes a shallow PN junction beneath the surface of the substrate of a MOS structure. In depletion mode, the depletion region of the MOS structure merges with the depletion region of the shallow PN junction. This increases the total width of the depletion region of the MOS varactor to reduce Cmin.
    Type: Grant
    Filed: April 5, 2007
    Date of Patent: November 17, 2009
    Assignee: Chartered Semiconductor Manufacturing, Ltd.
    Inventors: Manju Sarkar, Purakh Raj Verma
  • Publication number: 20090079033
    Abstract: Large tuning range junction varactor includes first and second junction capacitors coupled in parallel between first and second varactor terminals. First and second plates of the capacitors are formed by three alternating doped regions in a substrate. The second and third doped regions are of the same type sandwiching the first doped region of the second type. A first varactor terminal is coupled to the second and third doped regions and a second varactor terminal is coupled to the first doped region. At the interfaces of the doped regions are first and second depletion regions, the widths of which can be varied by varying the voltage across the terminals from zero to full reverse bias. At zero bias condition, junction capacitance (Cmax) is enhanced due to summation of two junction capacitances in parallel. At reverse bias condition, with the merging of the two junction depletion widths, the capacitor areas are drastically reduced, thereby reducing Cmin significantly.
    Type: Application
    Filed: September 20, 2007
    Publication date: March 26, 2009
    Applicant: CHARTERED SEMICONDUCTOR MANUFACTURING, LTD.
    Inventor: Manju SARKAR
  • Publication number: 20080246119
    Abstract: Large tuning range junction varactor includes first and second junction capacitors coupled in parallel between first and second varactor terminals. First and second plates of the capacitors are formed by three alternating doped regions in a substrate. The first and third doped regions are of the same type sandwiching the second doped region of the second type. A first input terminal is coupled to the first and third doped regions and a second terminal is coupled to the second doped region. At the interfaces of the doped regions are first and second depletion regions whose width can be varied by varying the voltage across the terminals from zero to full reverse bias.
    Type: Application
    Filed: April 5, 2007
    Publication date: October 9, 2008
    Applicant: Chartered Semiconductor Manufacturing, Ltd.
    Inventors: Manju SARKAR, Purakh Raj Verma
  • Publication number: 20080246071
    Abstract: A MOS varactor includes a shallow PN junction beneath the surface of the substrate of a MOS structure. In depletion mode, the depletion region of the MOS structure merges with the depletion region of the shallow PN junction. This increases the total width of the depletion region of the MOS varactor to reduce Cmin.
    Type: Application
    Filed: April 5, 2007
    Publication date: October 9, 2008
    Applicant: Chartered Semiconductor Manufacturing, Ltd.
    Inventors: Manju Sarkar, Purakh Raj Verma
  • Patent number: 6372652
    Abstract: A method for forming a thin film, electrically blowable fuse with reproducible blowing wattage using a sacrificial metal patch over a fuse dielectric layer and two etch processes; wherein the first etch process is selective to the metal patch and the second etch process is selective to the fuse dielectric layer. A fuse element, having an element width, is formed over a semiconductor structure, and a fuse dielectric layer is formed over the fuse element. A sacrificial metal patch is formed on the fuse dielectric layer; wherein the patch width being greater than the fuse element width. A second dielectric layer is formed on the sacrificial metal patch, and additional metal layers and dielectric layers may be formed over the second dielectric layer, but only the dielectric layers will remain over the fuse element.
    Type: Grant
    Filed: January 31, 2000
    Date of Patent: April 16, 2002
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Purakh Raj Verma, Zia Alan Shafi, Yu Shan, Zeng Zheng, Manju Sarkar, Shao-Fu Sanford Chu