Filter medium layered between supporting layers
US4011067A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 11, 1975 |
| Grant date | Mar 8, 1977 |
| Priority date | — |
| Expiry date | Sep 11, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S55/35
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A new filter medium, which can remove a high percentage of fine particles from a gas stream while causing a relatively low pressure drop in the gas stream, comprises a base porous web, one or more lightweight non-self-supporting layers of microfibers collected and carried on the base porous web, and a top porous web. A new aerosol filter apparatus incorporates the new filter medium to provide economical consistent filtering of air in a home, office, or industrial environment. In this new filter apparatus, a web of the filter medium extends from a supply roll across a stream of the air being cleaned to a take-up roll; and the filter medium is advanced from the supply roll to the take-up roll to gradually provide a fresh length of filter medium in the air stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.