Expendables container capable of measuring residual amount...

Details Expendables container capable of measuring residual amount... Expendables container capable of measuring residual amount...

2007-01-02

2007-01-02

Raevis, Robert (Department: 2856)

Measuring and testing

Liquid level or depth gauge

C347S007000

Reexamination Certificate

active

10531727

ABSTRACT:
This invention is an apparatus configured to receive expendable from an expendable container with a piezoelectric element attached. This apparatus has a detection signal generation circuit configured to charge and discharge the piezoelectric element, and generate a detection signal including information representing a cycle of remaining vibration of the piezoelectric element after a lapse of a predetermined standby time from a completion of the discharge; and a controller configured to generate a clock signal, and control the charge and the discharge of the piezoelectric element. The cycle is available for determining whether a residual quantity of the expendable is greater than a preset level. The controller is configured to determine the predetermined standby time by counting a number of pulses in the clock signal.

REFERENCES:
patent: 2005/0237349 (2005-10-01), Nishihara
patent: 62-095225 (1987-05-01), None
patent: 06-008427 (1994-01-01), None
patent: 07-137276 (1995-05-01), None
patent: 10-305590 (1998-11-01), None
patent: 2001-146019 (2001-05-01), None
patent: 2001-147146 (2001-05-01), None
patent: 2001-328275 (2001-11-01), None
patent: 2002-156270 (2002-05-01), None
patent: 2002-241450 (2002-08-01), None

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