Measuring and testing – Liquid level or depth gauge – Immersible electrode type
Reexamination Certificate
2004-12-22
2009-02-10
Williams, Hezron (Department: 2856)
Measuring and testing
Liquid level or depth gauge
Immersible electrode type
C073S30400R
Reexamination Certificate
active
07487677
ABSTRACT:
Apparatus and methods for employing electrical properties of water to indicate the level of filtered water in a filtered water container. The container is fitted with a hopper that holds unfiltered water. The hopper is fitted at its base with a removable and replaceable filter cartridge. Water is filtered by draining through the filter medium contained in the filter cartridge into the lower portion of the container. The water level in the filtered water container is monitored by means of one or more water level detector strips in the hopper or in the lower portion of the filtered water container. The detector strips are in electrical communication with a detection circuit and a control unit. The control unit uses the detection strips to monitor water level and uses such data to track filtered water consumption and to determine when the filter cartridge should be replaced.
REFERENCES:
patent: 3038610 (1962-06-01), Hetherington
patent: 3503507 (1970-03-01), Raupp et al.
patent: 3586018 (1971-06-01), Bogardh et al.
patent: 3861565 (1975-01-01), Rickmeier, Jr.
patent: 4169377 (1979-10-01), Scheib
patent: 4302337 (1981-11-01), Larson et al.
patent: 4588500 (1986-05-01), Sprenger et al.
patent: 4681677 (1987-07-01), Kuh et al.
patent: 4769135 (1988-09-01), Norton
patent: 4772386 (1988-09-01), Grout et al.
patent: 4895648 (1990-01-01), Hankammer
patent: 4986901 (1991-01-01), Nohren, Jr. et al.
patent: 4998228 (1991-03-01), Eger et al.
patent: 5190643 (1993-03-01), Duncan et al.
patent: 5328597 (1994-07-01), Boldt, Jr. et al.
patent: 5457665 (1995-10-01), Reid
patent: 5536394 (1996-07-01), Lund et al.
patent: 5560393 (1996-10-01), Clack
patent: 5649471 (1997-07-01), Heynderickx et al.
patent: 5665224 (1997-09-01), Levene et al.
patent: 5785844 (1998-07-01), Lund et al.
patent: 5830360 (1998-11-01), Mozayeni
patent: 5873995 (1999-02-01), Huang et al.
patent: 5882507 (1999-03-01), Tanner et al.
patent: 5900138 (1999-05-01), Moretto
patent: 5900143 (1999-05-01), Dalton et al.
patent: 6024867 (2000-02-01), Parise
patent: 6033557 (2000-03-01), Gebhard et al.
patent: 6074550 (2000-06-01), Hofmann et al.
patent: 6224751 (2001-05-01), Hofmann et al.
patent: 6423224 (2002-07-01), Tanner et al.
patent: 4026634 (1992-02-01), None
patent: 4200253 (1993-07-01), None
patent: 0861809 (1998-09-01), None
patent: 1195 357 (2002-04-01), None
patent: 262045 (1926-06-01), None
patent: 2008540 (1979-06-01), None
patent: 2067888 (1981-08-01), None
patent: 2252514 (1992-08-01), None
patent: 2271106 (1994-04-01), None
patent: 2358789 (2001-08-01), None
patent: 2387229 (2003-10-01), None
patent: WO 95/04705 (1995-02-01), None
patent: WO 95/29131 (1995-11-01), None
patent: WO 96/13318 (1996-05-01), None
patent: WO 96/21621 (1996-07-01), None
patent: WO 98/05401 (1998-02-01), None
patent: WO 98/17582 (1998-04-01), None
patent: WO 98/30139 (1998-07-01), None
patent: WO 98/32705 (1998-07-01), None
patent: WO 00/66245 (2000-11-01), None
patent: WO 03/028848 (2003-04-01), None
Schwarz et al., “Electrical Engineering: An Introduction,” second edition, Oxford University Press, New York, 1993, cover page, pp. 45-51, 64-67, 146-152, 184-188.
Chai John Y.
Chai Sunny N.
Ko Derek C.
Fitzgerald John
Fook Tin Technologies Ltd.
Jenner & Block LLP
Williams Hezron
LandOfFree
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