Patent CA857170A successfully refreshed from Google Patents.
CA857170A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Double walled concentric drill pipe
Assignee: Becker Drilling Alberta Ltd
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Filing: —
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Granted: 1970-12-01
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Expires: 1987-12-01
Abstract
No abstract record available.
Inventors
- 👤 Floyd W. Becker
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-11-09 09:56
CPC Classifications
—
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