Patent ID: 7815865

Claim:
A liquid dispensing device, comprising: A. a tray for holding a liquid at a relatively constant level defining an approximately constant tray liquid level, B. a liquid container containing a liquid having an opening and positioned upside-down in said tray such that atmospheric pressure on the liquid in said tray and vacuum inside said container prevents liquid from draining from said container except when the liquid level in said tray drops to a level sufficient to allow air into said liquid container and to allow fluid to flow from said liquid container into said tray so that the level of the liquid in said tray returns to said approximately constant tray liquid level, and C. a syringe for drawing liquid from said tray, wherein positioning of said syringe for drawing fluid is simplified by reason of the fact that the level of fluid in said tray is maintained at said approximately constant level despite withdrawal of quantities of fluid from said tray.