Dispensing – With discharge assistant – Container with follower
Reexamination Certificate
2011-03-29
2011-03-29
Bomberg, Kenneth (Department: 3754)
Dispensing
With discharge assistant
Container with follower
C222S386000, C092S204000, C604S219000, C277S434000, C277S436000
Reexamination Certificate
active
07913881
ABSTRACT:
A piston assembly for use in a viscous material dispenser is disclosed. The assembly has a main body with an axial bore for receipt of a push rod. The body has a face including an annular recess and an endless lip surrounding the recess. A camming washer is disposed at least in part in the recess. The washer includes a perimeteral camming surface engageable with the lip. The body and washer are connected together for limited relative axial movement when the piston assembly is advanced against material in a cartridge to dispense such material. The relative movement is effective to cause the camming surface to force the lip outwardly into tight engagement with a wall of such a cartridge.
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Bomberg Kenneth
Meritool LLC
Nichols II Robert K
Tarolli, Sundheim Covell & Tummino LLP
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