Dispensing – Resilient wall – With flow controllers or closures
Patent
1982-03-25
1985-05-28
Rolla, Joseph J.
Dispensing
Resilient wall
With flow controllers or closures
222214, 222571, B65D 3700
Patent
active
045195269
ABSTRACT:
An anti-drip system for a dispenser in the form of a deformable conduit adapted to dispense a liquid, such as a photoresist, from a dispensing tip located at one end of the conduit includes a rigid housing which surrounds an intermediate portion of the conduit. The housing is closed except for a port which permits pressurized air to be supplied to and exhausted from the housing. At the commencement of a dispensing operation, the liquid is transported through the conduit as the housing is simultaneously pressurized, thereby crimping the intermediate portion of the conduit. At the conclusion of the dispensing operation, air pressure in the housing is simultaneously reduced, thereby allowing the conduit to expand and assume its natural substantially uncrimped shape. Expansion of the conduit creates a vacuum sufficient to suck back liquid which is being dispensed from the conduit. A pair of anti-drip systems may be utilized in combination with a pair of valves to actually meter liquid which is being dispensed through a deformable conduit.
REFERENCES:
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patent: 3511468 (1970-05-01), Young
patent: 3895748 (1975-07-01), Klingenberg
patent: 3982724 (1976-09-01), Citrin
patent: 3985268 (1976-10-01), Wood
patent: 3998103 (1976-12-01), Bjorklund et al.
patent: 4030640 (1977-06-01), Citrin et al.
patent: 4095722 (1978-06-01), Miller
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patent: 4369664 (1983-01-01), Bunce et al.
Cascio et al., IBM Technical Disclosure Bulletin, vol. 20, No. 1, (Jun. 1977).
Huppert Michael S.
Machine Technology, Inc.
Rolla Joseph J.
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