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Elmer E. Clear received US Patent No. 3,380,542 on April 30, 1968, filed February 21, 1966. It was assigned to Phillips Petroleum Co.
The patent's description opens:
This invention relates to a method for restoring lost circulation in a well being drilled with an oil-base drilling fluid which includes substantially water-free drilling fluids and water-in-oil emulsion drilling fluids.
- Author
- Elmer E. Clear
- Published by
- US Patent Office
- Series
- US Patent No. 3,380,542
- Date
- April 30, 1968
- Library no.
- ACL Doc 23561 · asbestosclaims.law/library/23561
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 2 pages · 203 KB
Where it was listed
- Asbestos, June 1968, in its patents department (the year's issues)
Cite this document
Elmer E. Clear. “Restoring lost circulation in a well drilled with an oil base drilling fluid (US Patent 3,380,542, 1968).” April 30, 1968. US Patent No. 3,380,542. US Patent Office. AsbestosClaims.Law Library, ACL Doc 23561. https://asbestosclaims.law/library/23561.
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