Patents by Inventor John Henry Davies

John Henry Davies 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: 6627444
    Abstract: A method and a solid phase calibrant are provided suitable for use by untrained personnel to calibrate an analytical instrument under field conditions away from a laboratory. Filter discs or other suitable substrates are impregnated, by the process of adsorption, with solutions of known concentrations of analytes and chromatographic phase materials, such as polymers, in suitable solvents. The substrate material is selected to be chemically inert and to not negatively interact with the analytes, the calibration process, or the analytical instrumentation. The polymers cause the analyte to adhere to the substrate until the solution is desorbed by heating, so that the impregnated substrates form stable calibration solutions in solid phase which can be easily and reliably stored, transported, and used by operators with minimal training. The substrate is preferably contained in a card holder which can be easily inserted into and preferably mate with an inlet for the analytical instrument.
    Type: Grant
    Filed: August 7, 2000
    Date of Patent: September 30, 2003
    Assignee: Smiths Detection - Toronto Ltd.
    Inventors: Maciej Goledzinowski, Ludmilla Danylewych-May, John Henry Davies
  • Patent number: 6619143
    Abstract: An method of, and an apparatus for, collecting a sample of a substance of interest, utilizes an apparatus having a device for collecting a vapor sample and a device for retaining a substrate. A substrate, having a working portion and a mounting portion, is mounted by the mounting portion of the substrate, whereby the working portion of the substrate is exposed for use. The apparatus so that the working portion of the substrate traverses surfaces of interest, to collect a particulate sample. A device for sampling vapor is operated to obtain a vapor sample. The vapor and particulate samples collected are analyzed.
    Type: Grant
    Filed: February 4, 2002
    Date of Patent: September 16, 2003
    Assignee: Barringer Research Limited
    Inventors: Ludmila Danylewych-May, John Henry Davies, Frank Kuja, Sabatino Nacson
  • Publication number: 20020148305
    Abstract: An method of, and an apparatus for, collecting a sample of a substance of interest, utilizes an apparatus having a device for collecting a vapor sample and a device for retaining a substrate. A substrate, having a working portion and a mounting portion, is mounted by the mounting portion of the substrate, whereby the working portion of the substrate is exposed for use. The apparatus so that the working portion of the substrate traverses surfaces of interest, to collect a particulate sample. A device for sampling vapor is operated to obtain a vapor sample. The vapor and particulate samples collected are analyzed.
    Type: Application
    Filed: February 4, 2002
    Publication date: October 17, 2002
    Inventors: Ludmila Danylewych-May, John Henry Davies, Frank Kuja, Sabatino Nacson
  • Patent number: 6446514
    Abstract: An method of, and an apparatus for, collecting a sample of a substance of interest, utilizes an apparatus having a device for collecting a vapor sample and a device for retaining a substrate. A substrate, having a working portion and a mounting portion, is mounted by the mounting portion of the substrate, whereby the working portion of the substrate is exposed for use. The apparatus so that the working portion of the substrate traverses surfaces of interest, to collect a particulate sample. A device for sampling vapor is operated to obtain a vapor sample. The vapor and particulate samples collected are analyzed.
    Type: Grant
    Filed: January 18, 2000
    Date of Patent: September 10, 2002
    Assignee: Barringer Research Limited
    Inventors: Ludmila Danylewych-May, John Henry Davies, Frank Kuja, Sabatino Nacson
  • Patent number: 5988002
    Abstract: A hand held sampling method is carried out using apparatus have a handle, a head connected to the handle and a mechanism for retaining a substrate on the head. The substrate is preferably a sheet-form flexible substrate which is mounted so as to present a collection portion thereof for collection of a sample. The substrate is preferably of a dimension so as to be readily fitted into the inlet portion of an analyzer. The apparatus is manipulated so that the collection portion of the substrate traverses surfaces of interest. The substrate is then removed and placed at the inlet of an analyzer for desorption of a sample. The apparatus enables an area to be sampled quickly and efficiently, while keeping a user's hands away from the surface, and this enables otherwise inaccessible areas to be sampled. It does not require any intermediate transfer steps, transferring a sample from a collection media to another substrate for subsequent analysis.
    Type: Grant
    Filed: August 24, 1998
    Date of Patent: November 23, 1999
    Assignee: Barringer Research Limited
    Inventors: Ludmila Danylewych-May, John Henry Davies
  • Patent number: 5859375
    Abstract: A hand held sampling apparatus and method are provided. The apparatus has a handle, a head connected to the handle and a mechanism for retaining a substrate on the head. The substrate is preferably a sheet-form flexible substrate which is mounted so as to present a collection portion thereof for collection of a sample. The substrate is preferably of a dimension so as to be readily fitted into the inlet portion of an analyzer. The apparatus enables an area to be sampled quickly and efficiently, while keeping a user's hands away from the surface, and this enables otherwise inaccessible areas to be sampled. It does not require any intermediate transfer steps, transferring a sample from a collection media to another substrate for subsequent analysis.
    Type: Grant
    Filed: April 3, 1996
    Date of Patent: January 12, 1999
    Assignee: Barringer Research Limited
    Inventors: Ludmila Danylewych-May, John Henry Davies
  • Patent number: 5741984
    Abstract: An apparatus for the collection of a chemical sample from the fingers of an individual for subsequent analytical analysis comprises a token having a base and a substrate on the base. The substrate defines an area such that when the token is removed from a token dispenser the fingers of the individual come into contact with the substrate. Sufficient force must be applied by the fingers of the individual to the substrate when the token is removed from the token dispenser that a chemical sample is transferred from the fingers of the individual to the substrate. The token is then presented for analysis. The substrate may be polytetrafluoroethylene or cotton. A token handler for use in association with the token and an analyzer is also disclosed. Additionally, a method of using the token to obtain a chemical sample from the fingers of an individual is disclosed.
    Type: Grant
    Filed: October 21, 1996
    Date of Patent: April 21, 1998
    Assignee: Barringer Technologies Inc.
    Inventors: Ludmila Danylewych-May, Frank J. Kuja, John Henry Davies