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:
Jul. 18, 1978
Filed:
Sep. 02, 1975
Applicant:
Inventors:
Yang J Kim, Villa Park, IL (US);
Belton R Williams, Naperville, IL (US);
Assignee:
Unitech Chemical Inc., Chicago, IL (US);
Primary Examiner:
Int. Cl.
CPC ...
C10G / ; C10M / ;
U.S. Cl.
CPC ...
208 18 ; 208 19 ; 208184 ; 208185 ;
Abstract
Screened and drained used lubricating oil stock is predistilled in a steam stripping still for about 4 hours or more. The thus predistilled used oil then flows to an evaporator for a vacuum distillation at a temperature below the cracking temperature of the stock, about 480.degree.-650.degree. F., to effect an evaporation of the used lubricating oil and its separation from a concentrate by-product of heavy lube hydrocarbons and additives.