Patents by Inventor John Leason

John Leason 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).

  • Synchronized vacuum degassing for liquid chromatography
    Patent number: 9770678
    Abstract: Described is a method for vacuum degassing of a liquid such as a solvent for a liquid chromatography system. The method includes modulating application of a vacuum to a fluid channel of a degasser so that each volume of a liquid drawn from the degasser experiences a residence time that is equal to the residence times of the other volumes. The residence time is determined as a time that the volume resides in the fluid channel under application of the vacuum and to a magnitude of the applied vacuum. The method is advantageous for use with liquid chromatography systems where differences in the diffusion rates of solvents into the degasser vacuum can otherwise introduce error into the composition gradient of a mobile phase.
    Type: Grant
    Filed: April 15, 2015
    Date of Patent: September 26, 2017
    Assignee: WATERS TECHNOLOGIES CORPORATION
    Inventors: Michael R. Jackson, Christopher Seith, Steven J. Ciavarini, Kara O'Donnell, John Angelosanto, John Leason
  • SYNCHRONIZED VACUUM DEGASSING FOR LIQUID CHROMATOGRAPHY
    Publication number: 20150298027
    Abstract: Described is a method for vacuum degassing of a liquid such as a solvent for a liquid chromatography system. The method includes modulating application of a vacuum to a fluid channel of a degasser so that each volume of a liquid drawn from the degasser experiences a residence time that is equal to the residence times of the other volumes. The residence time is determined as a time that the volume resides in the fluid channel under application of the vacuum and to a magnitude of the applied vacuum. The method is advantageous for use with liquid chromatography systems where differences in the diffusion rates of solvents into the degasser vacuum can otherwise introduce error into the composition gradient of a mobile phase.
    Type: Application
    Filed: April 15, 2015
    Publication date: October 22, 2015
    Inventors: Michael R. Jackson, Christopher Seith, Steven J. Ciavarini, Kara O'Donnell, John Angelosanto, John Leason
  • Methods of making and using an apparatus and devices for placing light and sample in photo-emitting or absorbing device
    Patent number: 8401346
    Abstract: The present invention relates to a device having an optical fiber coupled to a high pressure containment vessel and a method for making the same. The high pressure containment vessel can be an optical fiber based flow cell for a chromatography system.
    Type: Grant
    Filed: November 1, 2010
    Date of Patent: March 19, 2013
    Assignee: Waters Technologies Corporation
    Inventors: Anthony Jeannotte, Anthony C. Gilby, Theordore A. Dourdeville, Dennis DellaRovere, John Leason
  • Methods Of making And Using And Apparatus And Devices For Placing Light And Sample In Photo-Emitting Or Absorbing DeviceM
    Publication number: 20110044587
    Abstract: The present invention relates to a device having an optical fiber coupled to a high pressure containment vessel and a method for making the same. The high pressure containment vessel can be an optical fiber based flow cell for a chromatography system.
    Type: Application
    Filed: November 1, 2010
    Publication date: February 24, 2011
    Applicant: WATERS TECHNOLOGIES CORPORATION
    Inventors: Anthony Jeannotte, Anthony C. Gilby, Theodore Dourdeville, Dennis DellaRovere, John Leason
  • Methods of making and using an apparatus and devices for placing light and sample in photo-emitting or absorbing devices
    Patent number: 7859657
    Abstract: The present invention relates to apparatus and devices (11) for placing light with samples for analysis and method of making and using such apparatus and device.
    Type: Grant
    Filed: August 17, 2005
    Date of Patent: December 28, 2010
    Assignee: Waters Technologies Corporation
    Inventors: Anthony Jeannotte, Anthony C. Gilby, Theodore Dourdeville, Dennis DellaRovere, John Leason
  • METHODS OF MAKING AND USING AND APPARATUS AND DEVICES FOR PLACING LIGHT AND SAMPLE IN PHOTO-EMITTING OR ABSORBING DEVICES
    Publication number: 20100026999
    Abstract: The present invention relates to apparatus and devices (11) for placing light with samples for analysis and method of making and using such apparatus and device.
    Type: Application
    Filed: August 17, 2005
    Publication date: February 4, 2010
    Applicant: Waters Investments Limited
    Inventors: Anthony Jeannotte, Anthony C. Gilby, Theodore Dourdeville, Dennis DellaRovere, John Leason