Patents by Inventor Ravi Subbarayan

Ravi Subbarayan 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).

  • On-line fiber orientation closed-loop control
    Patent number: 6799083
    Abstract: A controller to provide base level fiber orientation control of a paper web. The controller achieves one or more indices that are derived from the online measurements of a fiber orientation sensor of the fiber ratio and the fiber angle. The indices are used for control of the sheet forming processes. The controller may be implemented by a single or multi stage fuzzy controller or the combination of fuzzy controllers with non-fuzzy logic controllers.
    Type: Grant
    Filed: February 21, 2002
    Date of Patent: September 28, 2004
    Assignee: ABB Inc.
    Inventors: Shih-Chin Chen, Ravi Subbarayan, Peter Q. Tran
  • On-line fiber orientation closed-loop control
    Publication number: 20030171838
    Abstract: A controller to provide base level fiber orientation control of a paper web. The controller achieves one or more indices that are derived from the online measurements of a fiber orientation sensor of the fiber ratio and the fiber angle. The indices are used for control of the sheet forming processes. The controller may be implemented by a single or multi stage fuzzy controller or the combination of fuzzy controllers with non-fuzzy logic controllers.
    Type: Application
    Filed: February 21, 2002
    Publication date: September 11, 2003
    Applicant: ABB Inc.
    Inventors: Shih-Chin Chen, Ravi Subbarayan, Peter Q. Tran