Process for making drilling fluid additives containing lignosulfonates
Patent 4755307 Issued on July 5, 1988. Estimated Expiration Date: 
August 22, 2006. 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.
August 22, 2006. 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 2935504 3544460 3634387 Water base drilling mud composition Drilling fluid additives Oil well drilling clay conditioners and method of their preparation Oil well drilling clay conditioners and method of their preparation Patent #: 4457853 InventorsAssigneeApplicationNo. 06/899509 filed on 08/22/1986US Classes:507/109, Includes metal compound other than an alkali or alkaline earth metal compound (e.g., Al, Cr, Fe, Mn, Cu, etc.)530/506Heavy metal, aluminum, silicon or phosphorus containingExaminersPrimary: Guynn, Herbert B.Attorney, Agent or FirmInternational ClassesC09K 8/20 (20060101)C09K 8/02 (20060101) AbstractAn improved process for making drilling fluid additives. The drilling fluid additives generally comprise titanium and/or zirconium lignosulfonates. The improved process of this invention can be performed without any delays caused by plugging during filtration. Filtration plugging problems are eliminated by adding only stoichiometric amounts of zirconium and/or titanium lignosulfonate to the lignosulfonate mixture prior to filtration.Other References
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