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US 5,007,556 AGranted
Metering dispenser
AssigneeBlock Drug Company, Inc.
InventorMyron J. Lover
Life of this patent
Estimating the term…
Abstract
A system accurately dispenses fluid by filling a metering chamber with fluid from a container. A barrier is used to pressurize the fluid so that substantially no vapor or gas remains within the metering chamber and so that substantially no vapor or gas exists within the containe. A metered dose is dispensed from the metering chamber through a valved outlet.
Claims10
A dispenser, comprising:
- (A) a container for containing fluid to be dispensed;
- (B) a metering valve connected to said container, said metering valve comprising:
- (a) a metering chamber;
- (b) a valved inlet for introducing a metered dose of the fluid into said metering chamber when said valved inlet is open;
- and
- (c) a valved outlet for dispensing the metered dose from said metering chamber when said valved inlet is closed;
- and
- (C) a barrier for pressurizing the fluid so that substantially no vapor or gas remains within said metering chamber when said valved inlet is open.
5 more elements
A dispenser, comprising:
- (A) a container containing fluid to be dispensed;
- (B) a metering valve connected to said container, said metering valve comprising:
- (a) a metering chamber;
- (b) a valve stem extending through said metering chamber;
- (c) a first passageway for introducing a metered dose of said fluid into said metering chamber when said valve stem is in a first position;
- (d) a second passageway for dispensing the metered dose from said metering chamber when said valve stem is in a second position;
- (e) means for closing said first passageway when said valve stem is in said second position;
- (f) means for closing said second passageway when said valve stem is in said first position;
- and
- (g) means for biasing said valve stem toward said first position;
- and
- (C) pressurizing means for pressurizing said fluid to be dispensed so that substantially no vapor or gas remains within said metering chamber when said valve stem is in said first position, said pressurizing means including pressurizing fluid and a barrier for separating said fluid to be dispensed from said pressurizing fluid, the pressure of said pressurizing fluid being greater than the vapor pressure of said fluid to be dispensed.
9 more elements
A method of dispensing fluid, said method comprising the steps of:
- filling a metering chamber with fluid to be dispensed from a chamber of a container to form a metered dose within said metering chamber, said fluid to be dispensed having propellant dissolved or mixed therein;
- pressurizing said fluid so that substantially no vapor or gas remains within said metering chamber and so that substantially no vapor or gas exists within said chamber of said container, said step of pressurizing said fluid including using pressurizing gas and a barrier for separating said fluid to be dispensed from said pressurizing gas, the pressure of said pressurizing gas being greater than the vapor pressure of said fluid to be dispensed;
- and
- dispensing said metered dose from said metering chamber through a valved outlet.
1 more element
Dependencies are inferred from the claim text.