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:
Jan. 05, 2016
Filed:
Sep. 02, 2013
Masato Tanabe, Yokohama, JP;
Masato Tanabe, Yokohama, JP;
Other;
Abstract
A crystal oscillator () (Y-cut) has a temperature characteristic in which its oscillating frequency significantly changes with temperature, whereas a crystal oscillator () (AT-cut) has a temperature characteristic in which its oscillating frequency is stable with temperature. Crystal oscillators () are cut from a raw material of the same type and configured to be substantially equal in shape, material, and size, and provide a combination of oscillation frequencies such that the frequency of a signal generated by a differential frequency circuit () will be less than or equal to 10 kHz within a measuring temperature range of 21 to 30° C. The frequency of a signal generated by differential frequency generating circuit () is output to a measurement apparatus main unit and a frequency counting circuit () measures the frequency of this signal by a reciprocal counting method to obtain at least eight or more significant digits.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile