Patents by Inventor David Edward Charlton

David Edward Charlton 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).

  • Fluid collection kit and method
    Patent number: 5981293
    Abstract: A fluid collection, filtration, and storage device is described. The device has a first tube with a closed first end, an open second end, inner tube-wall surfaces, and an internal diameter; a second tube with a first end porously closed by a filter and an open second end and having an external diameter smaller than the internal diameter of the first tube, the second tube slidably contacting the inner tube-wall surfaces of the first tube at the first end of the second tube when the second tube is inserted in the first tube; and a cap adapted to seal the open second end of the first tube and the open second end of the second tube in a single closing operation while the second tube is inserted into the first tube. The kit is particularly adapted for collecting and storing viscous biologic samples, such as saliva, in the inner tube after the sample has been mixed with a preservative or other substance initially located in the filter.
    Type: Grant
    Filed: April 29, 1998
    Date of Patent: November 9, 1999
    Assignee: Biex, Inc.
    Inventor: David Edward Charlton
  • Fluid collection kit and method
    Patent number: 5786228
    Abstract: A fluid collection, filtration, and storage device is described. The device has a first tube with a closed first end, an open second end, inner tube-wall surfaces, and an internal diameter; a second tube with a first end porously closed by a filter and an open second end and having an external diameter smaller than the internal diameter of the first tube, the second tube slidably contacting the inner tube-wall surfaces of the first tube at the first end of the second tube when the second tube is inserted in the first tube; and a cap adapted to seal the open second end of the first tube and the open second end of the second tube in a single closing operation while the second tube is inserted into the first tube. The kit is particularly adapted for collecting and storing viscous biologic samples, such as saliva, in the inner tube after the sample has been mixed with a preservative or other substance initially located in the filter.
    Type: Grant
    Filed: February 5, 1997
    Date of Patent: July 28, 1998
    Assignee: Biex, Inc.
    Inventor: David Edward Charlton
  • Fluid collection kit and method
    Patent number: 5786227
    Abstract: A fluid collection, filtration, and storage device is described. The device has a first tube with a closed first end, an open second end, inner tube-wall surfaces, and an internal diameter; a second tube with a first end porously closed by a filter and an open second end and having an external diameter smaller than the internal diameter of the first tube, the second tube slidably contacting the inner tube-wall surfaces of the first tube at the first end of the second tube when the second tube is inserted in the first tube; and a cap adapted to seal the open second end of the first tube and the open second end of the second tube in a single closing operation while the second tube is inserted into the first tube. The kit is particularly adapted for collecting and storing viscous biologic samples, such as saliva, in the inner tube after the sample has been mixed with a preservative or other substance initially located in the filter.
    Type: Grant
    Filed: February 5, 1997
    Date of Patent: July 28, 1998
    Assignee: Biex, Inc.
    Inventor: David Edward Charlton