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A dispenser for dispensing a substance, such as a liquid lipstick or other cosmetic, pharmaceutical or cosmeceutical product, has a body with a variable-volume storage chamber for storing the product. A dispensing portion is connected with the body and a one-way valve for dispensing amounts of produ

A dispenser for dispensing a substance, such as a liquid lipstick or other cosmetic, pharmaceutical or cosmeceutical product, has a body with a variable-volume storage chamber for storing the product. A dispensing portion is connected with the body and a one-way valve for dispensing amounts of product therethrough. The dispensing portion defines a compression chamber in fluid communication with the storage chamber for receiving product therefrom, and an outlet aperture coupled in fluid communication with the compression chamber. The one-way valve has a valve seat, and a visco-elastic valve cover seated on the valve seat and defining a normally-closed, axially-extending seam therebetween forming a fluid-tight seal between the valve cover and valve seat. The flexible valve cover is movable relative to the valve seat, and the seam is connectable in fluid communication with the outlet aperture to allow the passage of product through the seam and out of the dispenser. An actuator is drivingly connected to the compression chamber for pressurizing product within the compression chamber and dispensing an amount of product within the compression chamber.

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1. A dispenser for dispensing a substance, comprising: a body including a variable-volume storage chamber for storing the substance therein;a dispensing portion connected with the body and defining a compression chamber connectable in fluid communication with the storage chamber for receiving substa

1. A dispenser for dispensing a substance, comprising: a body including a variable-volume storage chamber for storing the substance therein;a dispensing portion connected with the body and defining a compression chamber connectable in fluid communication with the storage chamber for receiving substance therefrom, and an outlet aperture coupled in fluid communication with the compression chamber;a one-way valve including a valve seat and a flexible valve cover overlying and forming an interference fit with the valve seat and defining a normally-closed, seam therebetween forming a fluid-tight seal between the valve cover and the valve seat, wherein the flexible valve cover is movable relative to the valve seat and the seam is connectable in fluid communication with the outlet aperture to allow passage of an amount of the substance through the seam and out of the dispenser;a manually engageable actuator defining a manually depressible portion movable between first and second positions and biased in the direction from the second position toward the first position;wherein (i) during movement of the manually depressible portion from the second position toward the first position the compression chamber is in fluid communication with the variable-volume storage chamber for permitting substance to flow from the variable-volume storage chamber into the compression chamber, and (ii) during movement of the manually depressible portion from the first position toward the second position the compression chamber is not in fluid communication with the variable-volume storage chamber and the substance within the compression chamber is pressurized above an opening pressure of the one-way valve and, in turn, the substance is dispensed through the normally closed seam of the one-way valve and out of the dispenser. 2. A dispenser as defined in claim 1, wherein the manually depressible portion is biased by a spring. 3. A dispenser as defined in claim 2, wherein the spring is an elastic spring. 4. A dispenser as defined in claim 3, wherein the elastic spring is dome shaped. 5. A dispenser as defined in claim 2, wherein the spring is connected to the actuator. 6. A dispenser as defined in claim 1, wherein the storage chamber is defined by a flexible bladder. 7. A dispenser as defined in claim 1, wherein the manually engageable actuator at least partially defines the compression chamber. 8. A dispenser as defined in claim 1, wherein the manually engageable actuator is adjacent to the compression chamber. 9. A dispenser as defined in claim 1, further comprising at least one cover for selectively covering and exposing at least one of the dispensing portion and an exterior of the valve. 10. A dispenser as defined in claim 9, wherein the at least one cover is movably mounted on the dispenser. 11. A dispenser as defined in claim 9, wherein the at least one cover is movable between a closed position covering the at least one of the dispensing portion and the exterior of the valve, and an open position exposing the at least one of the dispensing portion and the exterior of the valve. 12. A dispenser for dispensing a substance, comprising: a body including a variable-volume storage chamber for storing the substance therein;a one-way valve including a valve seat and a flexible valve cover overlying and forming an interference fit with the valve seat and defining a normally-closed seam therebetween forming a fluid-tight seal between the valve cover and the valve seat, wherein the flexible valve cover is movable relative to the valve seat and the seam is connectable in fluid communication with the variable-volume storage chamber to allow passage of an amount of the substance through the seam and out of the dispenser; anda pump coupled in fluid communication between the variable-volume storage chamber and the valve seam. 13. A dispenser as defined in claim 12, further comprising an actuator for actuating the pump and, in turn, for pressurizing the substance above a valve opening pressure of the one-way valve and, in turn, for dispensing the substance through the normally closed seam of the one-way valve and out of the dispenser. 14. A dispenser as defined in claim 13, wherein the actuator is a manually engageable actuator. 15. A dispenser for dispensing a substance, comprising: a body;a variable-volume storage chamber;first means connectible in fluid communication with the variable-volume storage chamber for receiving substance from the variable-volume storage chamber and compressing therein the substance;second means connectible in fluid communication with the first means (i) for normally sealing the first means along a seam and preventing the dispensing of substance below a threshold pressure through the second means, and (ii) for substantially sequentially opening the seam to allow the passage of substance at a pressure greater than the threshold pressure through the second means and out of the dispenser; andthird means (i) for manual engagement and movement from a first position toward a second position, for preventing fluid communication between the first means and the variable-volume storage chamber during movement from the first position toward the second position, and for pressurizing the substance in the first means above the threshold pressure of the second means and dispensing the substance through the second means and out of the dispenser, and (ii) for movement from the second position toward the first position, for allowing fluid communication between the first means and the variable-volume storage chamber during movement from the second position toward the first position, and for permitting substance to flow from the variable-volume storage chamber into the first means;wherein the second means comprises a one-way valve including a valve seat and a flexible valve cover seated on the valve seat forming an interference fit therewith and defining a normally-closed seam therebetween forming a fluid-tight seal between the valve cover and valve seat. 16. A dispenser as defined in claim 15, wherein the first means is a dispensing portion defining a compression chamber, and the third means is an elastic actuator defining a manually depressible portion. 17. A dispenser as defined in claim 15, further comprising fourth means for reducing the volume of the storage chamber in an amount approximately equal to the volume of the substance dispensed. 18. A dispenser as defined in claim 17, wherein the fourth means is a flexible bladder. 19. A method for storing and dispensing a substance with a dispenser including a variable-volume storage chamber, a dispensing valve including a valve seat, and a flexible valve cover overlying and forming an interference fit with the valve seat and forming a valve seam therebetween, a compression chamber coupled in fluid communication between the variable-volume storage chamber and the valve seam, and a manually engageable actuator defining a manually depressible portion movable between first and second positions and normally biased towards the first position, the method comprising the following steps: storing substance in the variable-volume storage chamber;normally sealing the dispensing valve along the valve seam and preventing both the dispensing of substance below a threshold pressure through the valve seam and external contamination of the substance in the variable-volume storage chamber through the valve seam;manually depressing the manually depressible portion between the first and second positions, wherein (i) during movement of the manually depressible portion from the second position toward the first position, substance is permitted to flow from the variable-volume storage chamber into the compression chamber, and (ii) during movement of the manually engageable portion from the first position toward the second position, substance in the compression chamber is pressurized to a pressure greater than the threshold pressure and, in turn, opening the valve seam to allow the passage of substance at a pressure greater than the threshold pressure through the valve seam and out of the dispenser; anddecreasing the volume of the variable-volume storage chamber in an amount approximately equal to the volume of the substance dispensed. 20. A dispenser as defined in claim 1, wherein an energy required to open portions of the one-way valve decreases in a direction from an interior toward an exterior thereof. 21. A dispenser for dispensing a substance, comprising: a body including a variable-volume storage chamber for storing the substance therein;a dispensing portion connected with the body and defining a compression chamber connectable in fluid communication with the storage chamber for receiving substance therefrom, and an outlet aperture coupled in fluid communication with the compression chamber;a one-way valve including a valve seat and a flexible valve cover overlying and forming an interference fit with the valve seat and defining a normally-closed, seam therebetween forming a fluid-tight seal between the valve cover and the valve seat, wherein the flexible valve cover is movable relative to the valve seat and the seam is connectable in fluid communication with the outlet aperture to allow passage of an amount of the substance through the seam and out of the dispenser;a manually engageable actuator defining a manually depressible portion movable between first and second positions and biased in the direction from the second position toward the first position;wherein (i) during movement of the manually depressible portion from the second position toward the first position the compression chamber is in fluid communication with the variable-volume storage chamber for permitting substance to flow from the variable-volume storage chamber into the compression chamber, and (ii) during movement of the manually depressible portion from the first position toward the second position the compression chamber is not in fluid communication with the variable-volume storage chamber and the substance within the compression chamber is pressurized above an opening pressure of the one-way valve and, in turn, the substance is dispensed through the normally closed seam of the one-way valve and out of the dispenser, wherein at least a segment of the valve cover engages the valve seat substantially throughout dispensing of the substance. 22. A dispenser as defined in claim 1, wherein during dispensing of the substance, segments of the valve cover progressively open and then close after passage of substance therethrough in a direction from an the interior toward an exterior of the one-way valve.