Aerosol dispenser
AssigneeLeafgreen Limited
InventorsKeith Laidler, Kevin Laidler
Life of this patent
Estimating the term…
Abstract
An aerosol dispenser has a canister to contain a liquid product to be dispensed together with a propellant present at least partly as a gas and valve to control the release of the liquid product from the canister. The dispenser also has a vapor phase tap for introducing a portion of the gaseous propellant into the liquid product as it is dispensed. The dispenser has a flow control device for varying the rate at which the propellant has is introduced into the liquid product through the vapor phase tape in dependence on the pressure of the contents of the canister. The flow control device can be used to reduce the amount of propellant gas bled into the liquid product, particularly when the dispenser is full and the pressure in the canister is high, as a way of conserving the propellant gas.
Claims27
An aerosol dispenser comprising a canister adapted to contain a liquid product to be dispensed and a propellant present in the canister at least partly as a gas, said dispenser having a valve for controlling the release of the liquid product from the canister and means for introducing a portion of the gaseous propellant into the liquid product as it is dispensed, the dispenser further comprising a flow control means for varying the rate at which the propellant gas is introduced into the liquid product in dependence on the pressure of the contents in the canister, characterised in that the flow control means is configured such that the ratio of propellant gas to liquid product dispensed is increased as the pressure in the dispenser decreases over the useful life of the dispenser.
An aerosol dispenser comprising a canister adapted to contain a liquid product to be dispensed and a propellant present in the canister at least partly as a gas, said dispenser having a valve for controlling the release of the liquid product from the canister and means for introducing a portion of the gaseous propellant into the liquid product as it is dispensed, characterised in that the dispenser further comprises a first flow control device for varying the rate at which the propellant gas is introduced into the liquid product in dependence on the pressure of the contents in the canister and a separate second flow control device for varying the rate at which the liquid flows through the valve in dependence on the pressure of the contents in the canister, the first and second flow control devices being configured such that the ratio of propellant gas to liquid product dispensed is increased as the pressure in the dispenser decreases over the useful life of the dispenser.
An aerosol dispenser comprising a canister adapted to contain a liquid product to be dispensed and a propellant present in the canister at least partly as a gas, said dispenser having a valve for controlling the release of the liquid product from the canister and means for introducing a portion of the propellant gas into the liquid product as it is dispensed, the dispenser being configured so that the portion of the propellant gas is introduced into the liquid product within the valve so that the combined liquid and propellant gas flow through the valve along a common flow path, characterised in that the dispenser further comprises a flow control means for varying the rate at which the propellant gas is introduced into the liquid product in dependence on the pressure of the contents in the canister, the flow control means being configured such that the ratio of propellant gas to liquid product dispensed is increased as the pressure in the dispenser decreases over the useful life of the dispenser.
Dependencies are inferred from the claim text.