Patent attributes
A fluid dispenser contains and dispenses metered amounts of fluid, and in some embodiments comprises a reservoir for containing fluid; a chamber positioned substantially within the reservoir for containing a quantity of fluid; and a piston moveable within the chamber in a first direction to draw fluid into the chamber from the reservoir, and movable in a second direction to discharge a metered amount of fluid from the chamber. A user-manipulatable control can be coupled to the piston to move the piston with respect to the chamber, and in some cases to select the desired metered amount of fluid to be dispensed. Also, a pawl can be used to selectively permit and inhibit movement of the piston in the first and/or second directions to prevent partial doses from being dispensed from the fluid dispenser.
