Drop counter

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system

Reexamination Certificate

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Details

C250S574000, C356S410000, C073S861060, C604S065000

Reexamination Certificate

active

07414255

ABSTRACT:
The present invention relates to a Drop Counter for counting a succession of falling liquid drops. The Drop Counter includes a light emitting diode for providing a light beam directed to a falling liquid drop. A photo diode sensor is positioned in side-by-side relation with the light emitting diode and detects reflected light from the falling liquid drop. The photo diode sensor provides an output signal when reflected light is detected and further includes a counter for receiving the output signal and counting the number of times the output signals are received.

REFERENCES:
patent: 3563090 (1971-02-01), Deltour
patent: 3734622 (1973-05-01), Adler
patent: 4181130 (1980-01-01), Bailey
patent: 4314484 (1982-02-01), Bowman
patent: 4509943 (1985-04-01), Hanzawa
patent: 4533350 (1985-08-01), Danby et al.
patent: 4673820 (1987-06-01), Kamen
patent: 4786800 (1988-11-01), Kamen
patent: 4820281 (1989-04-01), Lawler, Jr.
patent: 4936828 (1990-06-01), Chiang
patent: 5045069 (1991-09-01), Imparato
patent: 5152424 (1992-10-01), Weinreb et al.
patent: 5331309 (1994-07-01), Sakai
patent: 5411052 (1995-05-01), Murray
patent: 5982289 (1999-11-01), Kingsley et al.
patent: 6599282 (2003-07-01), Burko

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