Filter for use in a cartridge for the preparation of a beverage
US5008013A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1988 |
| Grant date | Apr 16, 1991 |
| Priority date | — |
| Expiry date | Sep 16, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2201/184
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A filter employed for the extraction of beverages is formed of a piece of material having two planar surfaces and a plurality of uniformly distributed openings extending through the piece. A plurality of nipples, equal in number to the number of openings, project from and out of at least one of the planar surfaces and extend for a distance substantially equal to the thickness between the planar surfaces of the piece of material, each nipple being associated with one of the openings through the piece of material, and each opening extends through each nipple. The openings have a shape of a truncated cone, a truncated pyramid, or a truncated tetrahedron, and each opening at the end of each nipple, which is disposed away from the planar surface from which the nipple projects, forms a minor base of the opening shape and each opening at the other planar surface forms a major base of the opening shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.