Measuring and testing – Liquid level or depth gauge
Reexamination Certificate
2008-09-11
2010-10-05
Williams, Hezron (Department: 2856)
Measuring and testing
Liquid level or depth gauge
C073S29000R
Reexamination Certificate
active
07805991
ABSTRACT:
A liquid sensing apparatus includes a liquid sensing chamber33having a liquid inlet port that is in communication with an external liquid container in which a liquid is reserved, and a liquid outlet port that is in communication with a liquid consuming apparatus, a movable member34movable depending on a liquid level in the liquid sensing chamber33, a recess portion33b,41afor cooperating with a wall surface of the movable member34to form a closed space when the movable member34is moved to a predetermined position depending the liquid level, and a piezoelectric sensing means40for applying a vibration to the recess portion and sensing a state of a free vibration following upon the vibration.
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Extended European Search Report, dated Mar. 31, 2009, EP 05809372.
Kimura Hitotoshi
Koshino Kazuo
Usui Minoru
Frank Rodney T
Seiko Epson Corporation
Stroock & Stroock & Lavan LLP
Williams Hezron
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