Patents by Inventor Ramkumar Singh Sankar Singh

Ramkumar Singh Sankar Singh 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).

  • Printhead nucleation detection using thermal response
    Patent number: 7976115
    Abstract: A method for determining the pulse width for driving printhead nozzles in a thermal inkjet printer. The printhead is preheated to a desired temperature during a maintenance mode. The printhead nozzle heaters are successively driven in respective heating intervals, where each successive heating interval is characterized by shorter drive pulse width pulses occurring at a higher pulse frequency. The printhead temperature data received during each heating interval is processed to determine a respective temperature slope. The temperature slopes are compared to a desired threshold temperature slope, and when a match is found, the pulse width associated with the matched temperature slope is used to drive the nozzle heaters during subsequent printer operations to print characters on a print medium.
    Type: Grant
    Filed: December 31, 2008
    Date of Patent: July 12, 2011
    Assignee: Lexmark International, Inc.
    Inventors: Bruce David Gibson, Shirish Padmakar Mulay, Nicholas Jon Post, Ramkumar Singh Sankar Singh
  • Printhead Nucleation Detection Using Thermal Response
    Publication number: 20100165029
    Abstract: A method for determining the pulse width for driving printhead nozzles in a thermal inkjet printer. The printhead is preheated to a desired temperature during a maintenance mode. The printhead nozzle heaters are successively driven in respective heating intervals, where each successive heating interval is characterized by shorter drive pulse width pulses occurring at a higher pulse frequency. The printhead temperature data received during each heating interval is processed to determine a respective temperature slope.
    Type: Application
    Filed: December 31, 2008
    Publication date: July 1, 2010
    Inventors: Bruce David Gibson, Shirish Padmakar Mulay, Nicholas Jon Post, Ramkumar Singh Sankar Singh