Patent ID: 8240934

Claim:
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.