Patents by Inventor Surendra Pal

Surendra Pal 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).

  • Flat panel detector for radiation imaging and pixel for use therein
    Patent number: 6232606
    Abstract: A flat panel detector for radiation imaging includes an array of pixels arranged in rows and columns. Gate lines interconnect the pixels of each row while source lines interconnect the pixels of each column. A radiation transducer is disposed over the pixel array. Each pixel includes a TFT switch having its gate electrode connected to a gate line and its source electrode connected to a terminal that is connectable to ground. The drain electrode of each TFT switch is connected to the pixel electrode of the pixel. The pixel electrode and a bottom electrode connected to a source line constitute a storage capacitor. When the TFT switch is biased and the pixel electrode is positively charged, the pixel electrode discharges through the TFT switch and onto the grounded terminal. This results in the release of negative charge held by the bottom electrode onto the source line, which is sensed by a charge amplifier connected to the source line.
    Type: Grant
    Filed: September 1, 1998
    Date of Patent: May 15, 2001
    Assignee: Ifire Technology, Inc.
    Inventor: Surendra Pal Singh
  • Method and apparatus for operating a dual gate TFT electromagnetic radiation imaging device
    Patent number: 6169286
    Abstract: A method and apparatus of operating a dual gate TFT electromagnetic radiation imaging device wherein the electrical conditions on each pixel are compared after exposure to radiation and during measurement. The pixel charge electrode is preset to a predetermined voltage level prior to radiation exposure so that the pixel may be operated beyond its linear operating range.
    Type: Grant
    Filed: July 21, 1998
    Date of Patent: January 2, 2001
    Assignee: 1294339 Ontario, Inc.
    Inventor: Surendra Pal Singh
  • Multiband antenna system for operating at L-band, S-band and UHF-band
    Patent number: 5572227
    Abstract: A multiband antenna system for operating at L-band, S-band and UHF-band. The antenna includes L-band antenna elements and S-band antenna elements provided in the form of quadrifilar helices spaced from each other on the surface of a hollow cylindrical insulator. UHF band antenna elements are provided in the form of a cage dipole on the surface of the hollow cylindrical insulator. The L-band antenna input is connected to a first connector through an L-band feed network card. The S-band antenna input is connected to a second connector through an S-band feed network card and the UHF-band antenna input is connected to a third connector through a split sheath balun provided along the axis of the hollow cylindrical insulator.
    Type: Grant
    Filed: January 25, 1995
    Date of Patent: November 5, 1996
    Assignee: Indian Space Research Organisation
    Inventors: Surendra Pal, Vodralli K. Lakshmeesha, Vaidyanathan Mahadevan, Lourdnathan Nicholas, Kunhambu Sadanandan, Subramaniam Aswathnarayan, Manickam Kumar, Mallavalli L. Subramanya, Venkatagiri Subrahmanya, Changantidurga V. Subramanyam, Thammaiahappa Mallikarjunaiah