Patent US2918819A successfully refreshed from Google Patents.
US3228151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling apparatus for deep oil wells
Assignee: Lee C Moore Corp
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Filing: 1962-02-15
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Granted: 1966-01-11
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Expires: 1982-02-15
Abstract
No abstract record available.
Inventors
- 👤 Joseph R Woolslayer
- 👤 Jenkins Cecil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:32
CPC Classifications
E; E21; E21B; E21B15/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
DEEP OIL WELL DRILLING APPARATUS COMPRISING A TALL STRUCTURE HAVING FRONT AND REAR ENDS, A ROTARY TABLE MOUNTED ON THE FRONT END OF THE STRUCTURE, A FLOOR ON TOP OF THE SUBSTRUCTURE, SURROUNDING SAID TABLE, A MAST HAVING REAR LEGS EXTENDING UPWARD FROM THE SUBSTRUCTURE AT OPPOSITE SIDES OF SAID FLOOR AND SPACED THEREFROM, THE MAST HAVING FRONT LEGS EXTENDING DOWNWARD IN FRONT OF THE SUBSTRUCTURE, PIVOTAL MEANS SUPPORTING THE LOWER ENDS OF THE FRONT LEGS, AND A FLOOR MOUNTED IN THE MAST ABOVE THE SUBSTRUCTURE AND RECESSED TO RECEIVE SAID FIRST-MENTIONED FLOOR IN SUBSTANTIALLY COPLANAR RELATION, THE MAST BEING SWINGABLE ON SAID PIVOTAL MEANS WITH ITS FLOOR FORWARD AWAY FROM THE SUBSTRUCTURE AND DOWN TO A RECLINING POSITION IN FRONT OF IT.
Claim 2
Dependent Claim
123 words
DEEP OIL WELL DRILLING APPARATUS COMPRISING A TALL STRUCTURE HAVING FRONT AND REAR ENDS, A ROTARY TABLE MOUNTED ON THE FRONT END OF THE STRUCTURE, A FLOOR ON TOP OF THE SUBSTRUCTURE, SURROUNDING SAID TABLE, A MAST HAVING REAR LEGS EXTENDING UPWARD FROM THE SUBSTRUCTURE AT OPPOSITE SIDES OF SAID FLOOR AND SPACED THEREFROM, THE MAST HAVING FRONT LEGS EXTENDING DOWNWARD IN FRONT OF THE SUBSTRUCTURE, PIVOTAL MEANS SUPPORTING THE LOWER ENDS OF THE FRONT LEGS, AND A FLOOR MOUNTED IN THE MAST ABOVE THE SUBSTRUCTURE AND RECESSED TO RECEIVE SAID FIRST-MENTIONED FLOOR IN SUBSTANTIALLY COPLANAR RELATION, THE MAST BEING SWINGABLE ON SAID PIVOTAL MEANS WITH ITS FLOOR FORWARD AWAY FROM THE SUBSTRUCTURE AND DOWN TO A RECLINING POSITION IN FRONT OF IT.
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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) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |