Treatment of hydrocarbon-contaminated particulate materials
Patent 5199997 Issued on April 6, 1993. Estimated Expiration Date: 
June 13, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 13, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2919898 3544369 3639172 3688781 3693733 3723309 3759324 3766997 3860019 Treatment of weighted drilling mud InventorAssigneeApplicationNo. 714651 filed on 06/13/1991US Classes:134/25.1, Work handled in bulk or groups134/10, Including regeneration, purification, recovery or separation of agent used134/26, Using sequentially applied treating agents134/40, Oils, grease, tar, or wax removal, by dissolving134/42MiscellaneousExaminersPrimary: Morris, TheodoreAssistant: El-Arini, Zeinab Attorney, Agent or FirmInternational ClassesB08B 003/00B08B 003/04 B08B 003/10 AbstractThis invention relates to methods and apparatus for cleansing oil-contaminated particulate materials. The invention is particularly applicable to the treatment of oil well drill sites and to methods and means for continuously cleansing drill cuttings found in used drilling muds. An initial step involves the use of an inclined tub equipped with an inclined spiral conveyor for continuous stripping of the oil and other contaminants from the drill cuttings, and a second step involves the use of a similar inclined tub and inclined spiral conveyor for continuous hot rinse water treatment of the stripped cuttings. An optional ambient or cold water final rinsing step is also disclosed.Other References
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