M-I DRILLING FLUIDS COMPANY

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Patent Activity in the Last 10 Years

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Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5639715 Aqueous based drilling fluid additive and compositionMar 24, 94Jun 17, 97[C09K]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5707939 Silicone oil-based drilling fluidsExpiredSep 21, 95Jan 13, 98[C09K]
4802502 Purge air control systemExpiredFeb 20, 87Feb 07, 89[B65D]
4740319 Oil base drilling fluid compositionExpiredJan 29, 86Apr 26, 88[C09K]
4710586 Fluid loss additives for oil base muds and low fluid loss compositions thereofExpiredOct 17, 84Dec 01, 87[C07C]
4696751 Vibratory screening apparatus and method for removing suspended solids from liquidExpiredAug 04, 86Sep 29, 87[B07B, B01D]
4647859 Method for effecting electric well logging with introduction of a fluid composition to minimize the effect of interfering ionsExpiredJun 27, 85Mar 03, 87[C09K, G01V]
4637883 Fluid loss additives for oil base muds and low fluid loss compositions thereofExpiredApr 07, 86Jan 20, 87[C09K]
4625548 Hydrostatic head pressure sensors for a system to determine fluid level and weightExpiredApr 12, 85Dec 02, 86[G01L, G01N, G01F]
4625553 System to determine the level and weight of liquid in a tank or the likeExpiredApr 12, 85Dec 02, 86[G01N]
4615841 Process for making alkaline-earth metal salts of alkaryl sulfonic acidsExpiredApr 25, 85Oct 07, 86[C07C]
4610005 Video borehole depth measuring systemExpiredJun 19, 80Sep 02, 86[B21B]
4596662 Compositions for use in drilling, completion and workover fluidsExpiredJun 13, 84Jun 24, 86[C09K, E21B]
4595736 Thermally stable drilling fluid additive comprised of a copolymer of catechol-based monomerExpiredDec 28, 84Jun 17, 86[C09K, C08F]
4579927 Copolymers of flavanoid tannins and acrylic monomersExpiredSep 26, 83Apr 01, 86[C08H]
4544756 Zwiterionic 2-alkyl imidazolines as emulsifying agents for oil based drilling fluidsExpiredNov 17, 83Oct 01, 85[C07D]
4539122 Corrosion inhibitor for heavy brinesExpiredFeb 21, 84Sep 03, 85[E21B]
4536297 Well drilling and completion fluid compositionExpiredJan 19, 84Aug 20, 85[C09K]
4526693 Shale and salt stabilizing drilling fluidExpiredMay 16, 83Jul 02, 85[C09K]
4525285 Method of preventing loss of an oil-base drilling fluid during the drilling of an oil or gas well into a subterranean formationExpiredAug 31, 83Jun 25, 85[C09K]
4525562 Thermally stable drilling fluid additiveExpiredJun 07, 83Jun 25, 85[C09K, C08F]

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