Patents by Inventor John H. Callahan

John H. 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).

  • Inductive detector for time-of-flight mass spectrometers
    Patent number: 5591969
    Abstract: A mass spectrometer is disclosed having a detector that detects the induction of a charge as an ion pulse passes by the detector and provides a representative output signal thereof. The inductive detector output signal is present regardless of the presence or intensity of preceding ion pulses and also the inductive detector is relatively insensitive to the velocity of the charged particles being detected. Further, the inductive detector does not destroy the vast majority of the ion pulses that it detects so that the non-destroyed ion pulses may be further analyzed by spectrometers attached in tandem.
    Type: Grant
    Filed: April 12, 1995
    Date of Patent: January 7, 1997
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Melvin Park, John H. Callahan