Patents by Inventor K. Nimalasiri de Silva

K. Nimalasiri de Silva 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: 5286451
    Abstract: An apparatus that provides controlled volumetric delivery of particulate material, particularly for delivery of a particulate sample for analysis. The apparatus includes a sample receiving tubular member that is vibrated or rotated relative to the sample container to agitate and fluidize a surface portion of the sample placed in an elongated container. A transporting gas carries the fluidized sample from the container through the tubular member. Sample delivery rate is controlled by a traversing mechanism that gradually inserts the moving tubular member into the upper fluidized portion of the sample. The apparatus allows total delivery of a known mass of a particulate sample at a predetermined delivery rate.
    Type: Grant
    Filed: May 21, 1993
    Date of Patent: February 15, 1994
    Assignee: Her Majesty the Queen in right of Canada, as represented by the Minister of Energy Mines and Resources
    Inventors: K. Nimalasiri De Silva, Roger Guevremont
  • Patent number: 5256374
    Abstract: A system for introducing a sample to an analyzing device, such as a spectrometer, wherein the flow rate of gas to the analyzing device is maintained substantially constant and uncontaminated during sample changeover. The system includes a flow controller and flow control paths arranged to avoid having any flow diverting valves or direction change in the analyte flow path.
    Type: Grant
    Filed: March 29, 1991
    Date of Patent: October 26, 1993
    Assignee: Her Majesty the Queen in right of Canada, as represented by the Minister of Energy Mines and Resources
    Inventors: K. Nimalasiri De Silva, Roger Guevremont
  • Patent number: 4836039
    Abstract: A method and apparatus for delivering a particulate sample to an analyzing device such as a flame or plasma spectrometer, which provides relatively uniform, continuous and controlled delivery of a sample and allows sample changing without disrupting the operation of the analyzing device.
    Type: Grant
    Filed: September 10, 1987
    Date of Patent: June 6, 1989
    Assignee: Canadian Patents & Development Limited
    Inventors: K. Nimalasiri de Silva, Roger Guevremont