Method and apparatus for reducing particulate generation caused

Details Method and apparatus for reducing particulate generation caused Method and apparatus for reducing particulate generation caused

1991-12-06

1993-11-23

Recla, Henry J.

Fluent material handling, with receiver or receiver coacting mea

Processes

Gas or variation of gaseous condition in receiver

141 8, B65B 3100

Patent

active

052635180

ABSTRACT:
An inner lid is attached to a vacuum chamber, covering an inner region of the vacuum chamber. An outer lid, also attached to the vacuum chamber, covers the inner lid, leaving a region between the inner lid and the outer lid. A gas conduit allows gas to flow between the inner region of the vacuum chamber and the region between the inner lid and the outer lid. A filter is placed in or immediately outside the gas conduit to prevent particles from entering the inner region of the vacuum chamber from the region between the inner lid and the outer lid. Since the pressure is the same on the top and bottom of the inner lid, the inner lid does not flex and thus does not rub against the vacuum chamber when the vacuum chamber is pumped down or vented up.

REFERENCES:
patent: 2387978 (1945-10-01), Casey
patent: 3800972 (1974-04-01), Raymond
patent: 4315579 (1982-02-01), Martin, Jr.
patent: 4945956 (1990-08-01), Bueyuekgueclue et al.
patent: 5096078 (1992-03-01), McQueeny

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