Coffee filtering

• US 3,937,134 A
• Filed: 01/11/1974
• Issued: 02/10/1976
• Est. Priority Date: 12/15/1971
• Status: Expired due to Term

• Current Assignee: Douwe Egberts Koninklijke Tabaksfabriek-Koffiebranderijen-Theehandel BV
• Original Assignee: Douwe Egberts Koninklijke Tabaksfabriek-Koffiebranderijen-Theehandel BV
• Inventors: Molenaar, Albert Meijlom, Veenstra, Melle
• Primary Examiner(s): Miles, Tim R.
• Assistant Examiner(s): Greenblum, Neil F.
• Application Number:
  US05/432,522
• Time in Patent Office: 760 Days
• Field of Search: 426/77, 426/82, 426/79, 426/433, 99/295, 99/306, 99/316, 99/322, 99/323
• US Class Current: 99/295
• CPC Class Codes: A47J 31/02 Coffee-making machines with removable extraction cups, to be placed on top of drinking-vessels i.e. coffee-makers with removable brewing vessels, to be placed on top of beverage containers, into which hot water is poured, e.g. cafe filter filters A47J31/06
• CPC Class Codes: A47J 31/0642 specially adapted to cooperate with a cartridge, e.g. having grooves or protrusions to separate cartridge from the bottom of the brewing chamber A47J31/0668 takes precedence
• CPC Class Codes: B65D 85/8061 Filters

Abstract

A coffee filter for a single percolation having an extraction chamber incing a support for supporting a pressed coffee tablet, and locating an underlying filter, a predetermined distance range from the bottom of the coffee tablet.

Claims

1. An apparatus for making coffee by oncethrough percolation of preheated water, comprising a reservoir for receiving the water, an extraction chamber for ground coffee separated from said reservoir by a wall which is perforated in such a way that when the apparatus is used the water flows or trickles from said reservoir to said chamber through gravity, a coffee tablet disposed in said chamber, and furthermore the extraction chamber comprises a support for a filter, said support leaving the greater part of the filter surface clear, and wherein the extraction chamber comprises a continuous annular collar means for supporting said tablet of roasted and ground coffee thereon above said filter and so constructed and arranged that the bottom of the coffee tablet is approximately parallel to said filter and located at a distance within the range of approximately 0.5 to 4mm. from said filter, and including means for retaining the tablet against the said collar.

2. An apparatus in accordance with claim 1 wherein said retaining means comprises lugs depending from said perforated wall adapted for engagement with said tablet, said extraction chamber comprising interior side wall surfaces diverging in an upward direction commencing at the outer periphery of said collar, water from said reservoir being adapted to moisten the bottom of said tablet through capillary action, so that the tablet will disintegrate evenly before said percolation.

3. An apparatus in accordance with claim 2 including other lug means positioned between said perforated wall and said annular collar to space said perforated wall from said collar to provide a clearance for escape of gases and vapors from said chamber past said perforated wall.