US 4,201,209 A · Molded hypodermic plunger with integral shaft and elastomeric head

Abstract

Articles having portions of materials with different properties are integrally formed by injection of two different thermoplastic materials simultaneously through separate gates into the same mold wherein the materials fuse or bond together. A plunger for a syringe formed by the process has a rigid shaft and an elastomeric head.

Claims1

Dependent claims

A molded plunger for a hypodermic syringe having a rigid thermoplastic shaft and a head portion made of a thermoplastic polymer having elastomeric properties compatible with the material of said shaft and integrally united therewith by co-injection molding the materials of said shaft and said head.

Dependencies are inferred from the claim text.

Facts

Application

05/908,945Filed 24 May 1978

Granted

6 May 1980

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

A61M 5/31511
Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing…:…
B29C 45/164
Making multilayered or multicoloured articles: the moulding materials being injected simultaneously
B29C 45/1676
Making multilayered or multicoloured articles: using a soft material and a rigid material, e.g. making articles with a sealing part
B29C 2045/1659
Using means for adhering or bonding the layers or parts to each other: fusion bonds

Abstract

Claims1

Dependent claims

Dependencies are inferred from the claim text.

Molded hypodermic plunger with integral shaft and elastomeric head

Life of this patent

Abstract

Claims1

Molded hypodermic plunger with integral shaft and elastomeric head

Life of this patent

Abstract

Claims1