Check valve, pouch with the check valve, and manufacturing appar

Details Check valve, pouch with the check valve, and manufacturing appar Check valve, pouch with the check valve, and manufacturing appar

1996-05-29

1999-07-27

Ferensic, Denise L.

Fluid handling

Line condition change responsive valves

Direct response valves

383103, F16K 1514

Patent

active

059273364

ABSTRACT:
A check-valved pouch has a main pouch body, and a check valve attached to the main pouch body. The main pouch body is formed of plastic film and defines an opening for receiving a substance. The check valve is formed of plastic film also, and includes a flat valve body defining an upper opening, with opposte sides and a lower end closed, and an inner passage for discharging gases toward the upper opening. A check piece formed of plastic film is disposed in an upper half of the valve body. The check valve further includes a porous filtering film disposed on one surface in a lower half of the valve body. The filtering film includes a filter surface, and a releasing film formed on the filter surface. The check valve is attached to the main pouch body, with the filtering film inserted into the main pouch body and the upper opening exposed to ambient air, whereby an interior of the main pouch body is communicable with an exterior through the filter surface, inner passage and upper opening.

REFERENCES:
patent: 3949934 (1976-04-01), Goglio
patent: 4290253 (1981-09-01), Domke et al.
patent: 4724657 (1988-02-01), Roovers et al.
patent: 4780378 (1988-10-01), McCartney, Jr. et al.
patent: 4842007 (1989-06-01), Kurtz
patent: 4890637 (1990-01-01), Lamparter
patent: 4975028 (1990-12-01), Schultz
patent: 5048846 (1991-09-01), Ichikawa
patent: 5332095 (1994-07-01), Wu
patent: 5388910 (1995-02-01), Koyanagi
patent: 5558441 (1996-09-01), Morrison et al.

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