Process for the manufacture of lubricating base oils
Patent 5098551 Issued on March 24, 1992. Estimated Expiration Date: 
May 16, 2010. 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.
May 16, 2010. 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 3658689 3861005 Catalytic dewaxing process Three-step catalytic dewaxing and hydrofinishing Process for hydrodewaxing hydrocracked lube oil base stocks Patent #: 4822476 InventorsApplicationNo. 523806 filed on 05/16/1990US Classes:208/111.3, With group VI metal or metal oxide (i.e., Cr, Mo, W, Po, or oxide thereof)208/27, Chemical treatment (refining or modification except mere solvent extraction)208/31, With solvent208/46, CHEMICAL CONVERSION OF HYDROCARBONS208/111.35, With group VIII metal or metal oxide (i.e., iron, or platinum group metal, or oxide thereof)208/135, With Group III metal or metal oxide containing catalyst208/136, With Group VI metal or metal oxide208/137With Group VIII metal or metal oxideExaminersPrimary: Myers, HelaneForeign Patent References
International ClassesC10G 023/04C10G 047/00 Foreign Application Priority Data1989-05-30 FRAbstractLubricating base oils having a high viscosity index, preferably at least 135, are manufactured by catalytic hydroisomerization of a hydrocarbonaceous feedstock, derived from a waxy crude oil, which feedstock has not been treated to remove a lubricating base oil fraction and which feedstock contains at least 30% by weight wax and has at least 80% by weight boiling above 300° C. and at most 30% by weight boiling above 540° C.Other References
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