Performance monitoring of gas-phase air filters
US5856198A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1996 |
| Grant date | Jan 5, 1999 |
| Priority date | — |
| Expiry date | Apr 29, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/15
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A scheme for monitoring the performance of a gas-phase filter in which upstream and downstream detection surfaces are exposed to upstream and downstream air so that molecular contamination may respectively form non-volatile residue thereon, and the performance of the air filter is determined based on the ratio of the amount of non-volatile residue respectively forming on the upstream and downstream detection surfaces. In another embodiment, a first electrical signal is provided representative of the amount of non-volatile residue forming on the upstream detection surface, a second electrical signal is provided representative of the amount of non-volatile residue forming on the downstream detection surface, and the performance of the air filter is determined in real-time based on the first and second electrical signals that are provided. The detection surfaces of the upstream and downstream detectors may be selected so that the mass of non-volatile residue forming thereon may be determined, either in real-time or by subsequent chemical analysis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.