Patents by Inventor Vasile B. Neculaes

Vasile B. Neculaes 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).

  • Low-noise, crossed-field devices such as a microwave magnetron having an azimuthally-varying axial magnetic field and microwave oven utilizing same
    Patent number: 6921890
    Abstract: Cost-effective, simple, low-noise, crossed-field devices such as a microwave magnetron, a microwave oven utilizing same, and crossed-field amplifier utilize an azimuthally varying, axial magnetic field. The magnetic configuration reduces and eliminates microwave and radio frequency noise. This microwave noise is present near the carrier frequency and as sidebands, far separated from the carrier. The device utilizes azimuthally-varying, axial, magnetic field perturbations. At least one permanent perturbing magnet having an azimuthally-varying magnetic field impressed thereupon causes the axial magnetic field to vary azimuthally in the magnetron and completely eliminates the microwave noise and unwanted frequencies. Preferably, the number of axial magnetic field perturbations is based on the number of cavities of the magnetron.
    Type: Grant
    Filed: August 19, 2003
    Date of Patent: July 26, 2005
    Assignee: The Regents of the University of Michigan
    Inventors: Vasile B. Neculaes, Ronald M. Gilgenbach, Yue-Ying Lau
  • Low-noise, crossed-field devices such as a microwave magnetron, microwave oven utilizing same and method of converting a noisy magnetron to a low-noise magnetron
    Patent number: 6872929
    Abstract: Low-noise, crossed-field devices such as a microwave magnetron, a microwave oven utilizing same, crossed-field amplifier and a method of converting a noisy magnetron to a low-noise magnetron utilize an azimuthally varying, axial magnetic field. The magnetic configuration reduces and eliminates microwave and radio frequency noise. This microwave noise is present near the carrier frequency and as sidebands, far separated from the carrier. The device utilizes azimuthally varying, axial, magnetic field perturbations. In one embodiment, at least one permanent magnet is placed against the azimuthally-symmetric, axial magnetic field magnetron magnets (four magnets work especially well). This additional permanent magnet(s) causes the axial magnetic field to vary azimuthally in the magnetron and completely eliminates the microwave noise and unwanted frequencies.
    Type: Grant
    Filed: April 17, 2003
    Date of Patent: March 29, 2005
    Assignee: The Regents of the University of Michigan
    Inventors: Vasile B. Neculaes, Ronald M. Gilgenbach, Yue-Ying Lau
  • Low-noise, crossed-field devices such as a microwave magnetron, microwave oven utilizing same and method of converting a noisy magnetron to a low-noise magnetron
    Publication number: 20040206754
    Abstract: Low-noise, crossed-field devices such as a microwave magnetron, a microwave oven utilizing same, crossed-field amplifier and a method of converting a noisy magnetron to a low-noise magnetron utilize an azimuthally varying, axial magnetic field. The magnetic configuration reduces and eliminates microwave and radio frequency noise. This microwave noise is present near the carrier frequency and as sidebands, far separated from the carrier. The device utilizes azimuthally varying, axial, magnetic field perturbations. In one embodiment, at least one permanent magnet is placed against the azimuthally-symmetric, axial magnetic field magnetron magnets (four magnets work especially well). This additional permanent magnet(s) causes the axial magnetic field to vary azimuthally in the magnetron and completely eliminates the microwave noise and unwanted frequencies.
    Type: Application
    Filed: April 17, 2003
    Publication date: October 21, 2004
    Applicant: The Regents of the University of Michigan
    Inventors: Vasile B. Neculaes, Ronald M. Gilgenbach, Yue-Ying Lau
  • Low-noise, crossed-field devices such as a microwave magnetron having an azimuthally-varying axial magnetic field and microwave oven utilizing same
    Publication number: 20040206751
    Abstract: Cost-effective, simple, low-noise, crossed-field devices such as a microwave magnetron, a microwave oven utilizing same, and crossed-field amplifier utilize an azimuthally varying, axial magnetic field. The magnetic configuration reduces and eliminates microwave and radio frequency noise. This microwave noise is present near the carrier frequency and as sidebands, far separated from the carrier. The device utilizes azimuthally-varying, axial, magnetic field perturbations. At least one permanent perturbing magnet having an azimuthally-varying magnetic field impressed thereupon causes the axial magnetic field to vary azimuthally in the magnetron and completely eliminates the microwave noise and unwanted frequencies. Preferably, the number of axial magnetic field perturbations is based on the number of cavities of the magnetron.
    Type: Application
    Filed: August 19, 2003
    Publication date: October 21, 2004
    Applicant: The Regents of the University of Michigan
    Inventors: Vasile B. Neculaes, Ronald M. Gilgenbach, Yue-Ying Lau