Gas filter apparatus
US4652285A · kind A · utility
Inventor
Key dates
| Filing date | Oct 19, 1983 |
| Grant date | Mar 24, 1987 |
| Priority date | — |
| Expiry date | Oct 19, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2201/127
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A filter apparatus includes a filter element. The filter element is formed of a sheet of gas-porous filter material which has been folded into accordian pleats. Alternate pleat-folds are of tight, near knife-edge definition, and arcuate form definition. Hence, all folds on one side of the accordian-folded material are of the knife-edge form, and all folds on the other side are of the arcuate. The pleated material is turned into a cylindrical conformation, with the arcuate folds confronting the central axis of the cylinder, and the tight, knife-edge folds outwardly directed. An adhesive-backed band circumscribes the cylinder to hold the accordian-folded material in such form. Ends caps, one with a central aperture formed therein, are fixed to the ends of the cylinder. The latter is then positioned and secured under a venturi section or pipe. The venturi section or pipe, in any cross-section thereof, is of rectilinear shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.