Structure of filter members
US3937663A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 5, 1974 |
| Grant date | Feb 10, 1976 |
| Priority date | — |
| Expiry date | Jun 5, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2201/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A filter structure comprising a support and a porous folded sheet having a plurality of cooperating groups of corrugations, wherein the folds of one group overlap at least in part the folds of the adjacent group and have a uniform thickness, length and substantially parallel fold apex lines. On opposed sides, the folded sheet has at least two borders each of which borders has a single group of folds terminating in a frontal edge located in a plane substantially perpendicular to the apex lines of the folds. The borders extend outwardly of the cooperating groups of the corrugations to form an area for contact with the support wherein the borders may be embedded by seal means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.