Patents by Inventor Jacques Froidevaux

Jacques Froidevaux 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 rate or the frequency error of a quartz timepiece and measuring apparatus for carrying out this method
    Patent number: 4201077
    Abstract: A method and apparatus for measuring the frequency error of a timebase frequency of a quartz timepiece, relative to a reference frequency. An input signal having a frequency equal to the timepiece timebase frequency is produced from the timepiece. The input signal is applied to a passive quartz crystal filter having a resonant frequency equal to the reference frequency, and which filter produces an output signal in response to the input signal. The phase of the input signal and the output of the passive quartz crystal filter is compared and at least one phase comparison signal related to the phase difference of the two signals is produced. The phase comparison signal drives a meter having a dial graduated in frequency error units to display the frequency error.
    Type: Grant
    Filed: October 10, 1978
    Date of Patent: May 6, 1980
    Assignee: Electronic Time Company ETIC S.A.
    Inventor: Jacques Froidevaux