Filters
US4200444A · kind A · utility
11Cited by
10References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 14, 1975 |
| Grant date | Apr 29, 1980 |
| Priority date | — |
| Expiry date | Mar 14, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S55/28
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Gas filtration apparatus comprises a filter element mounted in a casing having an inlet and an outlet so disposed that gas flowing from inlet to outlet is constrained to pass through the filter element, an audible warning device operable by gas flowing through the inlet and means responsive to the difference between the gas pressure at the inlet and the gas pressure at the outlet and arranged to cause the audible warning device to operate whenever said difference exceeds a predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.