04823685 is referenced by 13 patents and cites 8 patents.

An apparatus for making coffee or other hot drinks from finely divided material and hot water including a space for receiving the water and the material, a filter and a discharge conduit positioned below the filter. A source of gas under pressure is connected to the discharge conduit such that during a selected time the mixture of water and material inside the space can be agitated from below in counterflow to the natural flow of the extract.

Title
Apparatus for preparing hot drinks
Application Number
948342
Publication Number
4823685
Application Date
May 14, 1987
Publication Date
April 25, 1989
Inventor
Hendrik J J Sobczak
Achter de Kerk 7, 6365 Schinnen
NL
Peter M Boumans
De Bongerd 7, 6151 Br Munstergeleen
NL
Agent
Vorys Sater Seymour and Pease
IPC
A47J 31/00
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