Patents by Inventor Shirley Cheng

Shirley Cheng 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: 7110144
    Abstract: Method, system and computer-readable medium containing instructions for performing halftone gamma correction in a printing environment to achieve and maintain high print quality. The system includes one or more subsystems, including a tone reproduction subsystem that creates one or more print calibration pages, each having a tone curve defining a relationship between a plurality of input color levels, output color levels and a level of measured darkness. A pixel adjustment subsystem associates each input color level with one of the output color levels based on a desired percentage change in the level of measured darkness. Further, a gamma correction system performs gamma correction on a selected tone curve of one of the print calibration pages by associating each input color level with one of the output color levels based on the desired percentage change in the level of measured darkness in a substantially flat region of the selected tone curve.
    Type: Grant
    Filed: September 5, 2001
    Date of Patent: September 19, 2006
    Assignee: Xerox Corporation
    Inventors: Shirley Cheng, Mark A. Gwaltney, Robert P. Loce, Martin S. Maltz, Connie F. Purdum
  • Patent number: 6837445
    Abstract: The present invention comprises a nozzle type atomizer with two or more aligned “horn” stages. The definition of a “horn” stage is well known in the prior art as an effectively half wavelength length and a tapering shape with a central conduit. The present invention uses two to five, or more, horn stages integrally attached end to end. The dramatic improvement in amplitude of the vibration at the tip of the nozzle is without precedence in the prior art. The present invention makes application of transducer vibration at greater than 200 kHz possible. The present invention reduces the required applied energy for generating the necessary amplitude at the tip by the discovery of amplitude multiplication with two or more horn stages.
    Type: Grant
    Filed: December 29, 2003
    Date of Patent: January 4, 2005
    Inventor: Shirley Cheng Tsai
  • Patent number: 6669103
    Abstract: The present invention comprises a nozzle type atomizer with two or more aligned “horn” stages. The definition of a “horn” stage is well known in the prior art as an effectively half wavelength length and a tapering shape with a central conduit. The present invention uses two to five, or more, horn stages integrally attached end to end. The dramatic improvement in amplitude of the vibration at the tip of the nozzle is without precedence in the prior art. The present invention makes application of transducer vibration at greater than 200 kHz possible. The present invention reduces the required applied energy for generating the necessary amplitude at the tip by the discovery of amplitude multiplication with two or more horn stages.
    Type: Grant
    Filed: August 30, 2001
    Date of Patent: December 30, 2003
    Inventor: Shirley Cheng Tsai
  • Publication number: 20030048478
    Abstract: Method, system and computer-readable medium containing instructions for performing halftone gamma correction in a printing environment to achieve and maintain high print quality. The system includes one or more subsystems, including a tone reproduction subsystem that creates one or more print calibration pages, each having a tone curve defining a relationship between a plurality of input color levels, output color levels and a level of measured darkness. A pixel adjustment subsystem associates each input color level with one of the output color levels based on a desired percentage change in the level of measured darkness. Further, a gamma correction system performs gamma correction on a selected tone curve of one of the print calibration pages by associating each input color level with one of the output color levels based on the desired percentage change in the level of measured darkness in a substantially flat region of the selected tone curve.
    Type: Application
    Filed: September 5, 2001
    Publication date: March 13, 2003
    Applicant: Xerox Corporation
    Inventors: Shirley Cheng, Mark A. Gwaltney, Robert P. Loce, Martin S. Maltz, Connie F. Purdum
  • Publication number: 20030048038
    Abstract: The present invention comprises a nozzle type atomizer with two or more aligned “horn” stages. The definition of a “horn” stage is well known in the prior art as an effectively half wavelength length and a tapering shape with a central conduit. The present invention uses two to five, or more, horn stages integrally attached end to end. The dramatic improvement in amplitude of the vibration at the tip of the nozzle is without precedence in the prior art. The present invention makes application of transducer vibration at greater than 200 kHz possible. The present invention reduces the required applied energy for generating the necessary amplitude at the tip by the discovery of amplitude multiplication with two or more horn stages.
    Type: Application
    Filed: August 30, 2001
    Publication date: March 13, 2003
    Inventor: Shirley Cheng Tsai
  • Patent number: 5687905
    Abstract: The present invention is a dramatic enhancement of the two-fluid atomization art through the discovery of a method of causing resonance between capillary waves in the ultrasound range in a flowing liquid stream and the waves created at the surface of that stream of liquid by an impinging gas stream. In the present invention, the surface of a stream of liquid issuing from the outlet or nozzle of an ultrasonic atomizer is impinged upon by a stream of gas. That impinging stream of gas then develops, at the surface of the liquid stream already sustaining its own wave motion, a flow of gas substantially parallel to the flow of the liquid stream that moves faster than that surface of the liquid stream. The flow of the gas at the surface of the liquid stream moves sufficiently faster than the surface of the liquid stream to generate waves at the surface of the liquid stream.
    Type: Grant
    Filed: September 5, 1995
    Date of Patent: November 18, 1997
    Inventor: Shirley Cheng Tsai
  • Patent number: 5049201
    Abstract: Disclosed is a method of inhibiting corrosion on an electronic component. The method includes the steps of obtaining an electronic component and then cleaning the electronic component in a solution consisting of a complexing agent and a solvent in which the complexing agent is soluble. The complexing agent is a crown compound.
    Type: Grant
    Filed: June 22, 1989
    Date of Patent: September 17, 1991
    Assignee: International Business Machines Corporation
    Inventors: Shirley Cheng, Constance J. Araps, Allen J. Arnold, Jeffrey T. Coffin, Luu T. Nguyen