Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition
Reexamination Certificate
2008-04-29
2010-10-19
Nagpaul, Jyoti (Department: 1797)
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
C422S091000, C422S105000, C422S105000, C222S181100, C222S548000, C436S180000
Reexamination Certificate
active
07815865
ABSTRACT:
A liquid dispensing device. The liquid dispensing device has a tray for holding a liquid at a relatively constant level. A syringe is used for drawing fluid from the tray. A liquid container containing a liquid is positioned upside-down in the tray. Atmospheric pressure on the liquid in the tray and a vacuum inside the liquid container prevents liquid from draining from the container except when the liquid level in the tray drops to a level sufficient to allow air into the liquid container and to allow fluid to flow from the liquid container into the tray. The fluid flows from the liquid container into the tray until the level of liquid in the tray returns to the relatively constant level. The positioning of the syringe for drawing fluid is simplified in that the level of fluid in the tray is maintained at an approximately constant level despite withdrawal of quantities of fluid from the tray.
REFERENCES:
patent: 7364702 (2008-04-01), Hoffman et al.
Adams John A.
Benjamin James A.
Ganz Brian L.
Hoffman John
Jewell David W
Nagpaul Jyoti
Rigaku Automation, Inc.
Ross John R.
Ross, III John R.
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