Grounded centering ring for inhibiting polymer build-up on the diaphragm of a manometer
US6451159B1 · kind B1 · utility
13Cited by
3References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2000 |
| Grant date | Sep 17, 2002 |
| Priority date | — |
| Expiry date | Oct 18, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C16/52
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A grid protects a manometer diaphragm from plasma. A plasma chamber is used to generate a plasma. A manometer is used to measure the pressure in the plasma chamber. A grounded electrically conductive grid is used to screen out ions in the plasma before they reach a diaphragm in the manometer. The grid may be formed in a centering ring. A pipe may be used to connect the manometer to the plasma chamber. The centering ring may be placed in the joint in the pipe, with the centering ring and grid being grounded to the pipe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.