Patents Assigned to U.S. Filter Recovery Services (Mid-Altantic, Inc.)
  • Process to remove ash-forming contaminants from wet used oil
    Patent number: 6090273
    Abstract: Used lubricating oil containing unacceptable levels of moisture and ash-forming contaminants is dried and clarified by a process that includes flash drying, heat treating at a temperature within the range of 600.degree.-700.degree. F. for 2-5 hours, and cooling the heat treated oil. Optional internal recycle of the product from each of these steps can help enhance the clarification process.
    Type: Grant
    Filed: December 3, 1997
    Date of Patent: July 18, 2000
    Assignee: U.S. Filter Recovery Services (Mid-Altantic, Inc.)
    Inventor: Geza L. Kovacs