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Joe D. Ellard and Lee Bone received US Patent No. 3,618,680 on November 9, 1971, filed May 15, 1970.
The patent's abstract:
A method for drilling a well bore through a permafrost zone and a drilling fluid for use in that method wherein the drilling fluid contains oil, limited amounts of asbestos and/or silica, a limited tolerable amount of water, and the drilling fluid is cooled before use in the drilling method.
- Author
- Joe D. Ellard; Lee Bone
- Published by
- US Patent Office
- Series
- US Patent No. 3,618,680
- Date
- November 9, 1971
- Library no.
- ACL Doc 23021 · asbestosclaims.law/library/23021
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 4 pages · 375 KB
Where it was listed
- Asbestos, March 1972, in its patents department (the year's issues)
Cited on this site
Cite this document
Joe D. Ellard, Lee Bone. “Method for drilling in permafrost (US Patent 3,618,680, 1971).” November 9, 1971. US Patent No. 3,618,680. US Patent Office. AsbestosClaims.Law Library, ACL Doc 23021. https://asbestosclaims.law/library/23021.
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