Patents by Inventor Alan L. Helgesson

Alan L. Helgesson 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).

  • Patent number: 6392371
    Abstract: A power generator in which the rotor's mechanical rotation speed and the output frequency can be varied substantially independently of each other through electronic controls, to achieve results such as better match between speed and load regime of the primary mover and the generator's output.
    Type: Grant
    Filed: April 3, 2000
    Date of Patent: May 21, 2002
    Assignee: Cheng Power Systems, Inc.
    Inventors: Dah Yu Cheng, Alan L. Helgesson
  • Patent number: 4608578
    Abstract: A servo system for a braked accelerative transport in which a signal representing velocity of a carriage within the transport is compared to a first reference signal representing desired carriage velocity. The comparison yields an error signal which is used to adjust the brake of the transport. A hydraulic valve having an adjustable needle is used as the brake. A second selectable reference signal is provided so that the first reference signal can be bypassed when the carriage is reset at high velocity or is at reset. The valve is also bypassed on reset so that the adjusted brake mechanism is left intact on reset.
    Type: Grant
    Filed: October 29, 1984
    Date of Patent: August 26, 1986
    Assignee: Matrix Instruments Inc.
    Inventors: N. Balasubramanian, Alan L. Helgesson
  • Patent number: 3965434
    Abstract: An automatic frequency control system is described for maintaining the drive frequency applied to a linear accelerator to produce maximum particle output from the accelerator. The particle output amplitude is measured and the frequency of the radio frequency source powering the linear accelerator is adjusted to maximize particle output amplitude.
    Type: Grant
    Filed: December 1, 1972
    Date of Patent: June 22, 1976
    Assignee: SHM Nuclear Corporation
    Inventor: Alan L. Helgesson