Patents by Inventor Daniel K. Walter

Daniel K. Walter 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).

  • Method and system for operating an atomic clock with reduced spin-exchange broadening of atomic clock resonances
    Patent number: 6919770
    Abstract: The present invention relates to a method and system for using end resonances of highly spin-polarized alkali metal vapors for an atomic clock, magnetometer or other system. A left end resonance involves a transition from the quantum state of minimum spin angular momentum along the direction of the magnetic field. A right end resonance involves a transition from the quantum state of maximum spin angular momentum along the direction of the magnetic field. For each quantum state of extreme spin there are two end resonances, a microwave resonance and a Zeeman resonance. The microwave resonance is especially useful for atomic clocks, but it can also be used in magnetometers. The low frequency Zeeman resonance is useful for magnetometers.
    Type: Grant
    Filed: July 15, 2003
    Date of Patent: July 19, 2005
    Assignee: Princeton University
    Inventors: William Happer, Daniel K. Walter
  • Method and system for operating an atomic clock with reduced spin-exchange broadening of atomic clock resonances
    Publication number: 20040233003
    Abstract: The present invention relates to a method and system for using end resonances of highly spin-polarized alkali metal vapors for an atomic clock, magnetometer or other system. A left end resonance involves a transition from the quantum state of minimum spin angular momentum along the direction of the magnetic field. A right end resonance involves a transition from the quantum state of maximum spin angular momentum along the direction of the magnetic field. For each quantum state of extreme spin there are two end resonances, a microwave resonance and a Zeeman resonance. The microwave resonance is especially useful for atomic clocks, but it can also be used in magnetometers. The low frequency Zeeman resonance is useful for magnetometers.
    Type: Application
    Filed: July 15, 2003
    Publication date: November 25, 2004
    Inventors: William Happer, Daniel K. Walter