Measuring and testing – Liquid level or depth gauge – Immersible electrode type
Reexamination Certificate
2006-11-07
2006-11-07
Larkin, Daniel S. (Department: 2856)
Measuring and testing
Liquid level or depth gauge
Immersible electrode type
C073S29000R
Reexamination Certificate
active
07131329
ABSTRACT:
A liquid-amount detecting apparatus detects the amount of a liquid in containers. The liquid-amount detecting apparatus includes a liquid detecting circuit and a determining unit. The liquid detecting circuit includes electrode units disposed so as to be in contact with the liquid in the containers, which becomes electrically conductive when in contact with the liquid, an impedance, and an AC-signal source. An AC signal not containing a DC component is input from the AC-signal source to the electrode units through the source impedance, and a signal representing the status of electric connection of the electrode units is output. Furthermore, based on the output signal, a binary signal representing the presence or absence of electrical connection of the electrode units is output. The determining unit determines the presence or absence of the liquid at the electrode units based on the binary signal output from the-liquid detecting circuit.
REFERENCES:
patent: 2563280 (1951-08-01), Sehafer et al.
patent: 4110740 (1978-08-01), Akita et al.
patent: 4196625 (1980-04-01), Kern
patent: 4284951 (1981-08-01), Dahl et al.
patent: 4676101 (1987-06-01), Baughman
patent: 5775164 (1998-07-01), Kishi
patent: 5988783 (1999-11-01), Hirabayashi
patent: 6631970 (2003-10-01), Sato et al.
patent: 6650128 (2003-11-01), Sanders
patent: 6918296 (2005-07-01), Urquidi et al.
patent: 6962079 (2005-11-01), Eguchi et al.
patent: 2003/0155938 (2003-08-01), Sanders
patent: 0783968 (1997-07-01), None
patent: 11-179936 (1999-07-01), None
Eguchi Takeo
Namekawa Takumi
Takenaka Kazuyasu
Depke Robert J.
Frank Rodney
Larkin Daniel S.
Rockey, Depke, Lyons & Kitzinger LLC
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