Patent US3159218A successfully refreshed from Google Patents.
US3159218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater drilling method
Assignee: Shaffer Tool Works
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Filing: 1958-04-22
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Granted: 1964-12-01
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Expires: 1978-04-22
Abstract
No abstract record available.
Inventors
- 👤 Arthur E Wilde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:25
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/12; E21B7/128
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A METHOD FOR DRILLING INTO AN UNDERWATER FORMATION, INCLUDING THE STEPS OF: DEPOSITING AN ANCHOR ON THE SURFACE OF THE FORMATION, SAID ANCHOR HAVING AN OPENING THERETHROUGH AND HAVING GUIDE MEANS ATTACHED TO THE ANCHOR AND EXTENDING TO A SURFACE SUPPORT; ASSEMBLING A PIPE STRING ON THE SUPPORT; SECURING THE LOWER END OF THE PIPE STRING TO THE GUIDE MEANS; LOWERING THE PIPE STRING ALONG THE GUIDE MEANS THROUGH THE HOLE IN THE ANCHOR TO THE SURFACE OF THE FORMATION; DRILLING A HOLE IN THE FORMATION UNDER THE ANCHOR; REMOVING FROM SAID HOLE THE PIPE STRING; ASSEMBLING A CONDUCTOR CASING; ATTACHING A BREAKABLE LINK BETWEEN THE LOWER END OF THE CASING AND THE GUIDE MEANS; LOWERING THE CASING TO THE SURFACE OF THE FORMATION; BREAKING THE LINK; LOWERING THE CASING INTO THE HOLE AND CEMENTING THE CASING IN THE HOLE.
Claim 2
Independent Claim
140 words
A METHOD FOR DRILLING INTO AN UNDERWATER FORMATION, INCLUDING THE STEPS OF: DEPOSITING AN ANCHOR ON THE SURFACE OF THE FORMATION, SAID ANCHOR HAVING AN OPENING THERETHROUGH AND HAVING GUIDE MEANS ATTACHED TO THE ANCHOR AND EXTENDING TO A SURFACE SUPPORT; ASSEMBLING A PIPE STRING ON THE SUPPORT; SECURING THE LOWER END OF THE PIPE STRING TO THE GUIDE MEANS; LOWERING THE PIPE STRING ALONG THE GUIDE MEANS THROUGH THE HOLE IN THE ANCHOR TO THE SURFACE OF THE FORMATION; DRILLING A HOLE IN THE FORMATION UNDER THE ANCHOR; REMOVING FROM SAID HOLE THE PIPE STRING; ASSEMBLING A CONDUCTOR CASING; ATTACHING A BREAKABLE LINK BETWEEN THE LOWER END OF THE CASING AND THE GUIDE MEANS; LOWERING THE CASING TO THE SURFACE OF THE FORMATION; BREAKING THE LINK; LOWERING THE CASING INTO THE HOLE AND CEMENTING THE CASING IN THE HOLE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |