DRILLING SPECIALTIES COMPANY, A CORP. OF DE

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4923516 Well cement slurries and dispersants thereforExpiredJan 23, 89May 08, 90[C04B]
4876030 Organophilic clay suspension mediumExpiredNov 12, 87Oct 24, 89[C09K, C10M, B01J]
4842770 Drilling fluid thinnerExpiredMar 02, 88Jun 27, 89[C09K]
4775010 Methods and compositions for acid treating subterranean formationsExpiredJan 06, 88Oct 04, 88[E21B]
4752404 Blends of water soluble polymersExpiredMar 04, 87Jun 21, 88[E21B]
4743383 Drilling fluid additives for use in hard brine environmentsExpiredNov 24, 86May 10, 88[C09K]
4741868 Production of sulfonated asphaltExpiredMar 04, 85May 03, 88[C07C]
4735659 Compositions and a process for preparing water dispersible polymersExpiredAug 18, 86Apr 05, 88[C08J, C08L]
4726912 Stable suspensions of carboxymethyl cellulose and their preparationExpiredAug 27, 86Feb 23, 88[B01J]
4704214 Drilling fluidExpiredOct 11, 84Nov 03, 87[C09K]
4690219 Acidizing using n-vinyl lactum/unsaturated amide copolymersExpiredDec 05, 85Sep 01, 87[E21B]
4645609 Sulfonated asphalt/causticized lignite blendExpiredMay 23, 85Feb 24, 87[C09K]
4618433 Drilling fluids and thinners thereforExpiredJul 30, 84Oct 21, 86[C09K]
4604216 Drilling fluidsExpiredJun 11, 84Aug 05, 86[C09K]
4578201 N-vinyl lactam/unsaturated amide copolymers in thickened acid compositionsExpiredMar 05, 84Mar 25, 86[E21B]
4559149 Workover fluidExpiredJun 07, 84Dec 17, 85[E21B]
4548982 Drilling fluidsExpiredSep 02, 83Oct 22, 85[C08L]
4514308 Sulfonated asphaltExpiredJul 29, 83Apr 30, 85[C08L]
4502969 Workover and completion fluidsExpiredApr 12, 82Mar 05, 85[E21B]
4476033 Method and compositions for acidizing and fracturing wellsExpiredJul 30, 82Oct 09, 84[E21B]

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