Patents by Inventor John J. Ladasky, Jr.

John J. Ladasky, Jr. 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).

  • Apparatus and method for fluorescent lifetime measurement
    Patent number: 5315122
    Abstract: A flow cytometer measures fluorescence lifetimes by the phase shift of a reference signal and an emission from a fluorescent particle or cell in a flow chamber in order to identify the particle or cell. An acoustic optic modulator modulates laser light with a sinusoidal wave of a predetermined frequency to excite particles or cells. Detectors respond to emissions of individual particles or cells in the form of an output signal pulse at the predetermined frequency. Signals representative of fluorescence emitted and reference beam signals is measured. The particle is identified by the phase shift.
    Type: Grant
    Filed: August 25, 1992
    Date of Patent: May 24, 1994
    Assignee: Becton, Dickinson and Company
    Inventors: Bertram G. Pinsky, John J. Ladasky, Jr.