The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 07, 1999
Filed:
May. 30, 1996
Applicant:
Inventors:
Gary R Haefele, Littleton, CO (US);
Peter A Allen, Calistoga, CA (US);
Gary L Dunkel, Redwood City, CA (US);
Paul C Wegner, San Carlos, CA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
554 12 ; 554-8 ; 554 15 ; 554 16 ; 554 20 ; 208 13 ; 208 30 ; 208 31 ; 208 45 ; 196 1452 ; 426312 ;
Abstract
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.