Phatoresist dispensing system

Details Phatoresist dispensing system Phatoresist dispensing system

1991-06-25

1992-12-08

Huson, Gregory L.

Dispensing

Processes of dispensing

222 25, 222145, 222155, 604260, B67B 700

Patent

active

051690284

ABSTRACT:
In a liquid dispensing system, two pouches containing a liquid to be dispensed are connected by tubing to a reservoir and positioned at different levels above the reservoir. As the liquid is dispensed from the reservoir, the higher of the two positions is emptied and replaced with a filled pouch. The pouches are then reversed, with the new pouch in a lower position. When the other pouch is empty, it is replaced and the positions of the two pouches are again reversed. As a result, a continuous supply of liquid is dispensed from the reservoir. Any bubbles which are introduced into the system when the pouches are changed are automatically allowed to escape the system via a liquid level indicator line. A second level indicator provides an alarm or other signal should the liquid fall to the level of the reservoir.

REFERENCES:
patent: 2689463 (1954-09-01), Arf
patent: 2757823 (1956-08-01), Blanchard et al.
patent: 3469574 (1969-09-01), Durkan
patent: 3677248 (1972-07-01), McPhee
patent: 3756237 (1973-09-01), Chittenden et al.
patent: 3965895 (1976-06-01), Dabney
patent: 4157717 (1979-06-01), Goldberg
patent: 4324238 (1982-04-01), Genese et al.
patent: 4946439 (1990-08-01), Eggers

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