Novel filter and method of making same
US4075107A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 14, 1976 |
| Grant date | Feb 21, 1978 |
| Priority date | — |
| Expiry date | Jul 14, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24455
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
The invention relates to filter cups adapted for use in Melitta style coffee makers made of a unitary sheet of filter paper having integral fluted sides flaring outwardly from a stationary bottom and to a method and apparatus for making the same. The apparatus comprises complementary die members adapted to cut and flute the filter discs having central apertures, one of which is affixed to a heating and drying tube having the same diameter as the aperture. A plunger having a stretching head is passed through the other aperture to push the cut and formed filter discs into the heating and drying tube and at the same time to stretch the central portion to form a dish-shaped bottom having integral fluted sides flaring outwardly therefrom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.