The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 27, 1979
Filed:
Sep. 27, 1977
Manfred Stein, Eschborn, DE;
Quarz-Zeit AG, Frankfurt am Main, DE;
Abstract
A method and system for testing the accuracy of the oscillators of electronic clocks includes transforming a frequency signal corresponding to the output of a clock oscillator into a non-sinusoidal signal having the same frequency as the frequency signal and filtering the non-sinusoidal signal to pass a component of the non-sinusoidal signal having a frequency associated with a reference frequency to be compared with the signal passed by the filter such that clock oscillators operating at various frequencies of which the reference frequency is an integral multiple can be tested since the non-sinusoidal signal, which is preferably a sawtooth signal, contains harmonic components corresponding to the reference frequency.