Method and apparatus for reducing particulate generation caused by door or cover flexing on high vacuum equipment
US5219007A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 6, 1991 |
| Grant date | Jun 15, 1993 |
| Priority date | — |
| Expiry date | Dec 6, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J3/03
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.