Patents by Inventor Janet B. Callahan

Janet B. Callahan 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).

  • Microsample tube with reduced dead volume and barcode capability
    Patent number: 6350412
    Abstract: A micro sample tube is disclosed which is of a standard size on the exterior, but which has a reduced internal volume. A slope of an inner wall of the sample tube is a second order or higher curve, and is preferably a circle. Dead volume is reduced, and standard barcode labels can be used, due to the restricted internal dimensions and standard external dimensions. The curved inner wall of the sample tube, and an internal length of the sample tube which is the same as a conventional tube, reduces the likelihood of a sample probe of an automated analyzer impacting on an inner surface of the sample tube and potentially gouging the tube and/or damaging the automated probe. In a preferred embodiment, fins extend around said tube for reduced weight and improved heat transfer of the micro sample tube.
    Type: Grant
    Filed: October 5, 1995
    Date of Patent: February 26, 2002
    Assignee: Akzo Nobel N.V.
    Inventors: F. Diane Williams, Michael L. Bishop, Janet B. Callahan, Benjamin J. Chemelli
  • Method and instrument for automatically performing analysis relating to thrombosis and hemostasis
    Patent number: 5646046
    Abstract: This invention relates to a novel, fully automated spectrophotometric analyzer and method used for testing blood samples in the clinical laboratory for thrombosis and hemostasis properties. The analyzer tests samples in a fully randomized format, and is fully automated in the areas of specimen handling, sample preparation, optical inspection, data analysis and total quality control for imprecision and bias.
    Type: Grant
    Filed: February 14, 1995
    Date of Patent: July 8, 1997
    Assignee: AKZO Nobel N.V.
    Inventors: Timothy J. Fischer, Janet B. Callahan, Paul Joseph Braun, Thomas Beecher Givens, Julie F. Hoffman, William Chester Hulette, John Glenn Link, Charles Hermas Swope
  • Temperature regulation in a sample handling system for an optical monitoring system
    Patent number: 5236666
    Abstract: An arrangement is provided for temperature regulating a fluid sample in a cuvette transported through various stations of an automated system for optically monitoring the sample in the cuvette. A track guides the cuvette through the various stations of the optical monitoring system. The sample is in heat exchange relationship with the track by way of the cuvette. A drive unit drives the cuvette along the track. A cooling unit cools a first portion of the track. A heating unit heats a second portion. A heat flow restriction device restricts heat flow between the first and second portions of the track.
    Type: Grant
    Filed: February 11, 1992
    Date of Patent: August 17, 1993
    Assignee: Akzo N.V.
    Inventors: William C. Hulette, Joseph G. Karp, Janet B. Callahan, Paul J. Braun, Stephen G. Richardson
  • Direct fibrinogen assay
    Patent number: 5223437
    Abstract: An endpoint assay for measuring fibrinogen utilizing strong thrombin and weak plasma. In a preferred embodiment the assay is based on the direct conversion of a normalized signal from a sensor to fibrinogen concentration.
    Type: Grant
    Filed: May 8, 1991
    Date of Patent: June 29, 1993
    Assignee: Akzo N.V.
    Inventors: Julie F. Hoffman, Janet B. Callahan, C. Hermas Swope