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US 5,902,276 AGranted
Two-shot molded plunger
AssigneeLiebel-Flarsheim Company
InventorDavid Namey, Jr.
Life of this patent
Estimating the term…
Abstract
A syringe plunger is formed by a two-shot molding process. A hard plastic core is formed in a first mold, and the distal portion of the hard plastic core is subsequently overmolded with soft rubber. The result is a fully automated manufacturing process increasing quality and lowering costs, and a unique plunger having a hard plastic core and soft rubber exterior which are molecularly and permanently bonded together.
Claims16
A syringe plunger comprising:
- a hard core, and
- a soft exterior molded over said hard core by a two-shot process while said hard core is cooling and incompletely cured,
- wherein said soft exterior is molecularly bonded to said hard core as a consequence of said two-shot process.
A syringe comprising:
- a hollow cylindrical body including an open rearward end and a closed open end having a discharge opening, and
- a plunger inserted in said open rearward end, the plunger comprising a hard core and a soft exterior molded over said hard core by a two-shot process while said hard core is cooling and incompletely cured, wherein said soft exterior is molecularly bonded to said hard core as a consequence of said two-shot process.
Dependencies are inferred from the claim text.