Patents by Inventor Gunnar Hillerström

Gunnar Hillerström 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 for measuring the frequency of a sinusoidal signal
    Patent number: 6598005
    Abstract: A method for measuring a frequency f=&ohgr;/2&pgr; of a sinusoidal signal V(t)=Asin(&ohgr;t+&agr;) with an essentially constant amplitude A. Measured values are registered in the form of the instantaneous level of the signal V(t), V(t−h) and V(t−2h)at three points of time separated by a predetermined measuring period h, which corresponds to a measurement frequency fs=1/h.
    Type: Grant
    Filed: January 3, 2001
    Date of Patent: July 22, 2003
    Assignee: Försvarets Forskningsanstalt
    Inventor: Gunnar Hillerström