One-way valve stopper

Details One-way valve stopper One-way valve stopper

1978-11-15

1980-01-01

Norton, Donald F.

Bottles and jars

Closures

Self-sealing, piercable-type closure

215260, B65D 4736

Patent

active

041812336

ABSTRACT:
A one-way valve located anywhere on a stopper used in vacuum blood collection tubes, which permits venting or displacing any positive air pressure in a filled vacuum tube so that, when the pressure of the filled tube is greater than the pressure of the vein, the valve is actuated in the open position and when the pressures equalize, the valve closes. Such device also provides other advantages hereinafter set forth.

REFERENCES:
patent: 2153981 (1939-04-01), Heineman
patent: 3136440 (1964-06-01), Krug
patent: 3913781 (1975-10-01), Andreux

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