Receptacles – Closures – Vent in closure
Patent
1979-12-17
1982-02-16
Shoap, Allan N.
Receptacles
Closures
Vent in closure
5585C, 98 6, 98 8, 137588, 220254, 220374, 280 5D, 280 50SE, B65D 5116, B65D 5118
Patent
active
043155790
ABSTRACT:
A venting and filtering system for minimizing pressure differentials between the interior and exterior of a liquid storage tank while precluding ingress of contaminants into such tank. More specifically, a closure assembly for closing the access manhole in a liquid storage tank--e.g., a tank trailer suitable for transporting a comestible liquid product such as milk--including an upstanding tubular wall defining a vertical passage extending through the closure assembly, a sheet of filter material seated on the wall and extending entirely across the passage, and a dome-shaped cover seated on the upstanding wall and projecting rearwardly therefrom so as to define a downwardly facing vent with the vent, dome-shaped cover and passage defining a tortuous path extending entirely through the closure assembly, and wherein the dome-shaped cover is removably or pivotally secured to the closure assembly so as to permit ease of replacement of the sheet of filter material.
REFERENCES:
patent: 2092925 (1937-09-01), Lithson
patent: 2786091 (1957-03-01), Spellier
patent: 2825276 (1958-03-01), Porter
patent: 2878743 (1959-03-01), Trunnell
patent: 3611905 (1971-10-01), Brinks
patent: 3694566 (1972-09-01), Thompson et al.
patent: 4081107 (1978-03-01), Martin, Jr. et al.
patent: 4127216 (1978-11-01), Martin, Jr. et al.
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