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:
Aug. 02, 1977
Filed:
Jan. 02, 1976
Jean-Claude Martin, Neuchatel, CH;
Centre Electronique Horloger S.A., Neuchatel, CH;
Abstract
A quartz crystal thermometer in which a standard frequency is generated by a first oscillator circuit incorporating a quartz crystal element and in which a frequency which varies with temperature is generated by a second circuit incorporating the same quartz crystal element. Two electrode pairs are provided on the single quartz crystal element in order to excite two different modes of vibration of the quartz crystal element, with the metallization being on only one or on both of the major faces of the quartz crystal element. In accordance with preferred embodiments, an AT- or a BT-cut quartz crystal plate is utilized. The ratio of the said two frequencies provides an accurate measure of the temperature.