Weighing scales – Self-positioning – Electrical current generating or modifying
Reexamination Certificate
2006-05-30
2006-05-30
Gibson, Randy W. (Department: 2841)
Weighing scales
Self-positioning
Electrical current generating or modifying
C073S580000, C073S862590, C073SDIG010, C331S047000, C331S065000, C331S067000
Reexamination Certificate
active
07053319
ABSTRACT:
A weighing apparatus includes a SAW oscillator and a “push oscillator” to force the SAW oscillator into a desired mode of operation. A SAW temperature oscillator and a thermistor are also provided. The frequency of the “push oscillator” is made immune to temperature changes by generating it via a mixer mixing the SAW temperature oscillator with an adjustable fixed frequency oscillator. Long term stability of the SAW temperature oscillator is achieved by periodic calibration with the thermistor.
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“Pressure and acceleration sensitivity of SAW Interferometer” by Staples et al., 1981 Ultrasonics Symposium, pp. 155-158.
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Gordon Arnold S.
Kats Vyacheslav D.
Circuits and Systems, Inc.
Gibson Randy W.
Gordon & Jacobson P.C.
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