Reusable coffee brewing filter

A coffee filter comprising:

• (a) a cylindrical coffee retaining ring having an upper end, a lower end, an outer surface, and having an inner surface;
• (b) a cylindrical sleeve having an upper end, a lower end, an outer surface, and having an inner surface, the cylindrical sleeve being sized and fitted so that it may be slidably mounted upon the cylindrical coffee retaining ring so that the inner surface of the cylindrical sleeve is in close proximity with the outer surface of the cylindrical coffee retaining ring;
• (c) a sleeve and filter retaining means, such means being fixedly attached to or being a homogeneous part of the cylindrical coffee retaining ring and of the cylindrical sleeve, such means being capable, upon such slidable mounting of the cylindrical sleeve, of fixedly attaching the cylindrical sleeve to the cylindrical coffee retaining ring, and such means being capable of retaining filter paper so that such paper underlies and spans across the lower end of the cylindrical coffee retaining ring, the sleeve and filter retaining means so fixedly attaching the cylindrical sleeve to the cylindrical coffee retaining ring;
• the sleeve and filter retaining means comprising an annular filter paper receiving channel and an annular filter paper compressing ridge, the interior space of such channel and the outer surface of such ridge each extending outwardly from the outer and inner surfaces of the cylindrical coffee retaining ring and cylindrical sleeve, such channel and such ridge being fitted and positioned so that upon such slidable mounting of the cylindrical sleeve upon the cylindrical coffee retaining ring, and upon positioning of filter paper between the inner surface of the cylindrical sleeve and the outer surface of the cylindrical coffee retaining ring, such ridge may extend into such channel, such ridge there compressing and fixedly attaching such paper to the coffee filter so that such paper forms a coffee filtering membrane spanning across the lower end of the cylindrical coffee retaining ring;
• the sleeve and filter retaining means further comprising a plurality of second annular filter paper receiving channels, each such channel opening inwardly and the interior space of each such channel extending radially outward from the inner surface of the cylindrical sleeve;
• and each such channel being capable of selectively and adjustably receiving and retaining the annular filter paper compressing ridge of the cylindrical coffee retaining ring.