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Actor Marlon Brando has four patents, all named "Drumhead tensioning device and method."
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US Patent 4155410 - Method for correcting lost circulation
US Patent Issued on May 22, 1979
Estimated Patent Expiration Date:
June 26, 1998Estimated 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.
Estimated Patent Expiration Date:
June 26, 1998Estimated 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.AbstractLost circulation in a well occurring during drilling is reduced by aeration of clay-free, non-thixotropic, brine wellbore fluids comprising hydroxyalkyl cellulose and preferably magnesia as a stabilizer. The gas is easily and completely removed from the foam returned to surface with only a conventional degassing and gas busting equipment normally found in a solids removal system. The advantages of the clay-free, non-thixotropic, drilling fluids as known are preserved and the system allows rapid change from aerated to non-aerated fluid as required. | Inventor
AssigneeApplicationNo. 05/919142 filed on 06/26/1978US Classes:175/66, Treating spent or used fluid above ground175/69, Combined liquid and gaseous fluid175/72Prevention of lost circulation or cavingField of Search175/66, Treating spent or used fluid above ground175/69, Combined liquid and gaseous fluid175/71, Gaseous fluid or under gas pressure175/72, Prevention of lost circulation or caving175/24, AUTOMATIC CONTROL175/205WITH MEANS PROVIDING PRESSURIZED GAS CONTACT WITH DRILLING LIQUIDExaminersPrimary: Novosad, Stephen J.Attorney, Agent or FirmUS Patent References2726063, 2818230, 3040820, 3297098, 3303895, 3313362, 3387672, 3493059, 3844361, 3852201, 4013568Composition and method for drilling formations containing geothermal fluidIssued on: 03/22/1977 Inventor: Fischer , et al. International ClassesC09K 8/10 (20060101)C09K 8/02 (20060101) E21B 21/06 (20060101) E21B 21/00 (20060101) E21B 21/14 (20060101) |
