Patents by Inventor Mark Chu

Mark Chu 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).

  • Illuminating device incorporating a high clarity scattering layer
    Patent number: 7722224
    Abstract: The present invention provides improved optical elements, such as light diffusing films, plates, and lenses, which can be used in light-emitting devices, such as light fixtures to control the distribution of light projected onto illuminated objects, such as walls, sculptures, and landscaping. Compared to traditional light scattering films, plates or lenses, improvements in illuminance uniformity, optical throw, system efficacy, and aesthetic appearance are achieved. Embodiments of the invention utilize region(s) of volumetric asymmetric diffusion that allow a partial quantity of light to be transmitted without significant scattering in order to improve optical throw and illuminance uniformity. Embodiments can also eliminate hotspot and thus improve the illuminated uniformity.
    Type: Grant
    Filed: December 17, 2007
    Date of Patent: May 25, 2010
    Assignee: Fusion Optix, Inc.
    Inventors: Zane Coleman, Timothy Kelly, Mark Chu
  • Mutual exclusion at the record level with priority inheritance for embedded systems using one semaphore
    Patent number: 7334229
    Abstract: A method for providing mutual exclusion at a single data element level for use in embedded systems. Entries for tasks that are currently holding a resource are stored in a hold list. Entries for tasks that are not currently executing and are waiting to be freed are stored in a wait list. A single mutual exclusion semaphore flags any request to access a resource.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: February 19, 2008
    Assignee: Cisco Technology, Inc.
    Inventors: Michael F. McDonald, Sumeet Arora, Mark Chu
  • Mutual exclusion at the record level with priority inheritance for embedded systems using one semaphore
    Patent number: 6560627
    Abstract: A method for providing mutual exclusion at a single data element level for use in embedded systems. Entries for tasks that are currently holding a resource are stored in a hold list. Entries for tasks that are not currently executing and are waiting to be freed are stored in a wait list. A single mutual exclusion semaphore flags any request to access a resource.
    Type: Grant
    Filed: January 28, 1999
    Date of Patent: May 6, 2003
    Assignee: Cisco Technology, Inc.
    Inventors: Michael F. McDonald, Sumeet Arora, Mark Chu