Invention Grant
- Patent Title: Drilling fluid composition
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Application No.: US25797239Application Date: 1939-02-23
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Publication No.: US2214366APublication Date: 1940-09-10
- Inventor: FREELAND JOHN W , BYCK HAROLD T
- Applicant: SHELL DEV
- Assignee: Shell Development Co
- Current Assignee: Shell Development Co
- Priority: US25797239 1939-02-23
- Main IPC: E21B21/00
- IPC: E21B21/00
Information query
