Patent ID: 7600936

Claim:
A dual dispenser pen for dispensing two alternative products, said dispenser pen comprising a barrel having two open ends, a septum dividing the interior of the barrel into first and second chambers, a first product dispenser disposed at least partially within the first chamber, and a second product dispenser disposed at least partially within the second chamber, wherein one of the product dispenser is a screw-type dispenser comprising a sleeve having an open mouth, a piston within the sleeve adapted to push product out of the sleeve, the piston and sleeve having interacting structure which allow the piston to move axially within the sleeve, while preventing relative rotation between the piston and the sleeve, and a screw fixed within the barrel and having threads engaging corresponding threads in the piston to move the piston axially as the sleeve is turned with respect to the barrel, and further comprising a tab extending from the septum into a slot formed in the head of the screw to prevent the screw from rotating with respect to the barrel.