Filter and retaining device

Claim 1

A FILTER AND COFFEE GROUND RETAINER DEVICE FOR INSTALLATION WITHIN A COFFEE GROUND RETAINER DEVICE FOR INAND A CENTRALLY LOCATED FLUID DELIVERY PERCOLATOR TUBE THEREIN CONSISTING IN ITS ENTIRETY OF A SHEET OF POROUS FILTER MATERIAL, SAID SHEET HVING A HIGH DEGREE OF WET STRENGTH AND BEING FOLDABLE TO DEFINE AN ENCLOSURE CAPABLE OF HOLDING AND RETAINING GROUND COFFEE WHICH ENCLOSURE AND GROUND COFFEE MAY BE DISPOSED OF AS A UNIT, SAID SHET HAVING A SMOOTH, FLAT PLANAR SURFACE THROUGHOUT AND BEING OF SUBSTANTIALLY SQUARE CONFIGURATION WITH AN OPENING IN THE CENTER THEREOF, EACH CORNER OF SAID SHEET TERMINATING IN A ROUNDED EDGE PORTION TO ELIMINATE EXCESS MATERIAL FROM SAID SHEET IN FORMING SAID ENCLOSURE, EACH CORNER HAVING AN APERTURE FORMED THEREIN SPACED INWARDLY FROM SAID ROUNDED EDGE TOWARDS SAID CENTER OPENING, EACH OF SAID CORNERS PROVIDED WITH A MULTIPLICITY OF PIERCED PERFORATIONS SURROUNDING SAID APERTURE WITH THE GREATEST NUMBER OF SAID PERFORATIONS BEING BETWEEN SAID APERTURE AND CENTER OPENING, SAID SHEET BEING POSITIONABLE WITHIN SAID STRAINER WITH SAID TUBE EXTENDING THROUGH SAID CENTER OPENING, SAID CORNERS BEING FOLDABLE TOWARDS SAID TUBE TO FORM AN ENCLOSURE FOR COFFEE GROUNDS WITH SAID TUBE BEING THREADED THROUGH SAID APERTURES AND SAID CORNERS OVERLAPPING ONE ANOTHER WITH THE ROUNDED EDGE OF ONE CORNER OVERLAPPING ONLY A PORTION OF THE PERFORATIONS BETWEEN THE APERTURE AND THE CENTER OPENING OF THE DIAMETRICALLY OPPOSITE CORNER TO IMPROVE THE POROSITY OF THE OVERLAPPING PORTION OF SAID SHEET OF MATERIAL AND PERMITTING THE READY PASSAGE THERETHROUGH OF THE FLUID FROM SAID TUBE WHEREBY A SMOOTH AND EVEN DISTRIBUTION OF THE FLUID IS OBTAINED OVER THE COFFEE GROUNDS IN SAID ENCLSOURE.