05998640 is referenced by 33 patents and cites 12 patents.

A method and apparatus for continuously removing oil from oil-bearing solids such as tar sands, vegetables or other solid materials using a solvent is provided. By providing a pressure differential between the exterior and interior of an oil extraction chamber, substantially oil free solids may be removed from the oil extraction chamber through a solids extraction channel without removing any substantial volume of solvent through the solids extraction channel.

Title
Method for recovering oil from an oil-bearing solid material
Application Number
8/655723
Publication Number
5998640
Application Date
May 30, 1996
Publication Date
December 7, 1999
Inventor
Paul C Wegner
1340 Eaton Ave., San Carlos, 94070
CA, US
Gary L Dunkel
3794 Jefferson Ave., Redwood City, 94062
CA, US
Peter A Allen
8655 Franz Valley School Rd., Calistoga, 94545
CA, US
Gary R Haefele
6337 S. Jackson St., Littleton, 80121
CO, US
IPC
C07C 1/00
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