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Clarence O. Walker received US Patent No. 3,989,630 on November 2, 1976, filed December 9, 1974. It was assigned to Texaco Inc.
The patent's abstract:
An aqueous low solids drilling fluid especially suitable for drilling sloughing, mud yielding shale formations. The drilling fluid has an A.P.I. filtration rate in excess of 100 milliliters, a soluble calcium level in excess of 200 and preferably in excess of 1000 parts per million, a filtrate alkalinity greater than 0.1 milliliters of .02 N sulfuric acid per milliliter of filtrate, at least one pound per barrel excess or undissolved calcium hydroxide, a salinity of at least 50,000 parts per million and a ratio of plastic viscosity to yield point not greater than one.
- Author
- Clarence O. Walker
- Published by
- US Patent and Trademark Office
- Series
- US Patent No. 3,989,630
- Date
- November 2, 1976
- Library no.
- ACL Doc 22877 · asbestosclaims.law/library/22877
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 9 pages · 1.1 MB
Where it was listed
- Asbestos, March 1977, in its patents department (the year's issues)
Cite this document
Clarence O. Walker. “Low solids shale controlling drilling fluid (US Patent 3,989,630, 1976).” November 2, 1976. US Patent No. 3,989,630. US Patent and Trademark Office. AsbestosClaims.Law Library, ACL Doc 22877. https://asbestosclaims.law/library/22877.
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