Dispensing – Automatic control – Constant weight – volume or pressure control by output
Reexamination Certificate
2004-10-15
2009-02-24
Ngo, Lien T (Department: 3754)
Dispensing
Automatic control
Constant weight, volume or pressure control by output
C222S001000, C222S039000
Reexamination Certificate
active
07494028
ABSTRACT:
A fluid dispensing apparatus includes a pulse generator coupled to a pump that operates in discrete cycles. Each cycle includes a first part in which fluid is drawn into the pump through an inlet, and a second part in which fluid is expelled from the pump through an outlet. Each cycle results in a discrete, consistent volume of fluid being expelled. The pulse generator transmits discrete pulses to the pump, causing the pump to operate for a set number of cycles per pulse. The total number of cycles is a multiple of the number of pulses transmitted, so that the number of pulses determines the volume of fluid dispensed. Alternatively, the pump is driven through increments of the second part of the cycle, with the number of pulses supplied to the pump determining the proportion of the second part of the cycle completed, and therefore the volume of fluid dispensed.
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Compraelec, Brochure-Waterpumps-The MP 3 Series of Solenoid Pumps, Undated, p. 15,Strasbourg, France.
Fine Richard
Litterst Charles
Bereskin & Parr
Ngo Lien T
Zavida Coffee Company Inc.
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