Patent ID: 7537406

Claim:
A dispensing device for a flowable composition comprising: a tubular container; a drive screw having an axial bore, the drive screw being disposed within the tubular container; a cap for closing the container; a first seal and a second seal on the drive screw, the first and second seals forming with the inner wall of the tubular container and the outer wall of the drive screw an annular compartment for containing the flowable composition; at least one channel providing fluid communication between the annular compartment and the bore of the drive screw; and a drive associated with the cap and a complementary drive associated with the drive screw, the drives cooperatively decreasing the volume of the compartment each time the container is opened; the second seal, normally closing the channel, opening the channel in response to the decrease in volume in the compartment and permitting composition to flow through the channel into the axial bore of the drive screw.