Patents by Inventor Paul Poon

Paul Poon 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: 7968277
    Abstract: A photolithographic method uses different exposure patterns. In one aspect, a photo-sensitive layer on a substrate is subject to a first exposure using optics having a first exposure pattern, such as an x-dipole pattern, followed by exposure using optics having a second exposure pattern, such as a y-dipole pattern, via the same mask, and with the photo-sensitive layer fixed relative to the mask. A 2-D post pattern with a pitch of approximately 70-150 nm may be formed in a layer beneath the photo-sensitive layer using 157-193 nm UV light, and hyper-numerical aperture optics, in one approach. In another aspect, hard baking is performed after both of the first and second exposures to erase a memory effect of photoresist after the first exposure. In another aspect, etching of a hard mask beneath the photo-sensitive layer is performed after both of the first and second exposures.
    Type: Grant
    Filed: June 8, 2010
    Date of Patent: June 28, 2011
    Assignee: SanDisk 3D LLC
    Inventors: Yung-Tin Chen, Steven J. Radigan, Paul Poon, Michael Konevecki
  • Publication number: 20100243602
    Abstract: A photolithographic method uses different exposure patterns. In one aspect, a photo-sensitive layer on a substrate is subject to a first exposure using optics having a first exposure pattern, such as an x-dipole pattern, followed by exposure using optics having a second exposure pattern, such as a y-dipole pattern, via the same mask, and with the photo-sensitive layer fixed relative to the mask. A 2-D post pattern with a pitch of approximately 70-150 nm may be formed in a layer beneath the photo-sensitive layer using 157-193 nm UV light, and hyper-numerical aperture optics, in one approach. In another aspect, hard baking is performed after both of the first and second exposures to erase a memory effect of photoresist after the first exposure. In another aspect, etching of a hard mask beneath the photo-sensitive layer is performed after both of the first and second exposures.
    Type: Application
    Filed: June 8, 2010
    Publication date: September 30, 2010
    Inventors: Yung-Tin Chen, Steven J. Radigan, Paul Poon, Michael W. Konevecki
  • Patent number: 7794921
    Abstract: A photolithographic method uses different exposure patterns. In one aspect, a photo-sensitive layer on a substrate is subject to a first exposure using optics having a first exposure pattern, such as an x-dipole pattern, followed by exposure using optics having a second exposure pattern, such as a y-dipole pattern, via the same mask, and with the photo-sensitive layer fixed relative to the mask. A 2-D post pattern with a pitch of approximately 70-150 nm may be formed in a layer beneath the photo-sensitive layer using 157-193 nm UV light, and hyper-numerical aperture optics, in one approach. In another aspect, hard baking is performed after both of the first and second exposures to erase a memory effect of photoresist after the first exposure. In another aspect, etching of a hard mask beneath the photo-sensitive layer is performed after both of the first and second exposures.
    Type: Grant
    Filed: December 30, 2006
    Date of Patent: September 14, 2010
    Assignee: Sandisk Corporation
    Inventors: Yung-Tin Chen, Steven J. Radigan, Paul Poon, Michael W. Konevecki
  • Patent number: 7682942
    Abstract: A method creates pillar structures on a semiconductor wafer and includes the steps of providing a layer of semiconductor. A layer of photoresist is applied over the layer of semiconductor. The layer of photoresist is exposed with an initial pattern of light to effect the layer of photoresist. The photoresist layer is then etched away to provide a photoresist pattern to create the pillar structures. The photoresist pattern is processed in the layer of photoresist after the step of exposing the layer of photoresist and prior to the step of etching to reduce the dimensions of the photoresist pattern in the layer of photoresist.
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: March 23, 2010
    Assignee: Sandisk 3D LLC
    Inventors: Yung-Tin Chen, Michael Chan, Paul Poon, Steven J. Radigan
  • Publication number: 20090087963
    Abstract: A method creates pillar structures on a semiconductor wafer and includes the steps of providing a layer of semiconductor. A layer of photoresist is applied over the layer of semiconductor. The layer of photoresist is exposed with an initial pattern of light to effect the layer of photoresist. The photoresist layer is then etched away to provide a photoresist pattern to create the pillar structures. The photoresist pattern is processed in the layer of photoresist after the step of exposing the layer of photoresist and prior to the step of etching to reduce the dimensions of the photoresist pattern in the layer of photoresist.
    Type: Application
    Filed: September 28, 2007
    Publication date: April 2, 2009
    Applicant: SanDisk Corporation
    Inventors: Yung-Tin Chen, Michael Chan, Paul Poon, Steven J. Radigan
  • Publication number: 20080160423
    Abstract: A photolithographic method uses different exposure patterns. In one aspect, a photo-sensitive layer on a substrate is subject to a first exposure using optics having a first exposure pattern, such as an x-dipole pattern, followed by exposure using optics having a second exposure pattern, such as a y-dipole pattern, via the same mask, and with the photo-sensitive layer fixed relative to the mask. A 2-D post pattern with a pitch of approximately 70-150 nm may be formed in a layer beneath the photo-sensitive layer using 157-193 nm UV light, and hyper-numerical aperture optics, in one approach. In another aspect, hard baking is performed after both of the first and second exposures to erase a memory effect of photoresist after the first exposure. In another aspect, etching of a hard mask beneath the photo-sensitive layer is performed after both of the first and second exposures.
    Type: Application
    Filed: December 30, 2006
    Publication date: July 3, 2008
    Inventors: Yung-Tin Chen, Steven J. Radigan, Paul Poon, Michael W. Konevecki
  • Publication number: 20050065775
    Abstract: A method and system for inputting Chinese characters from an English keyboard into a computer. The invention is implemented via a software application that runs on a computer to which a physical or virtual keyboard device is connected. The software application has a database of English character sequences each of which is associated with a Chinese character. The software application captures character sequences generated by the user operating the keyboard, and searches its database for matches to the captured sequence.
    Type: Application
    Filed: September 23, 2003
    Publication date: March 24, 2005
    Inventor: Paul Poon