Espresso filter including hole uniformity enhancement region
US10349772B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 5, 2011 |
| Grant date | Jul 16, 2019 |
| Priority date | — |
| Expiry date | Nov 15, 2033 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D24/001
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A coffee filter includes a metallic member having a flat portion in which tapered exit regions are formed that extend from the bottom of the flat portion to vertices interior to the flat portion. The flat portion is provided with a hole uniformity enhancement region between the top of the flat portion and the exit region vertices that are interior to the flat portion. The top of the flat portion is micro-machined to remove a part of the hole uniformity enhancement region to a predetermined depth into the hole uniformity enhancement region. Holes are formed in the top of the flat portion extending from the micro-machined top of the flat portion through the hole uniformity enhancement region to the vertices of the tapered exit regions. The predetermined depth of the micro-machined top of the flat portion is selected to prevent the micro-machined top of the flat portion from meeting the tapered exit regions to promote and maintain uniformity of the holes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.