US3185227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drilling apparatus
Assignee: Individual
•
Filing: 1962-03-02
•
Granted: 1965-05-25
•
Expires: 1982-03-02
Abstract
No abstract record available.
Inventors
- 👤 Fred B Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:36
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
146 words
IN WELL DRILLING APPARATUS A TUBULAR DRILLING STRING ADAPTED TO BE LOWERED INTO A WELL BORE, A DRILLING BIT ATTACHED TO THE LOWER END OF THE STRING FOR ROTATION THEREWITH IN ENGAGEMENT WITH THE BOTTOM OF THE BORE TO FORM AN ANNULAR ABOUT THE STRING AND HAVNG A PASSAGEWAY THROUGH WHICH FLUID MAY FLOW DOWNWARDLY THROUGH THE STRING AND UPWARDLY IN THE ANNULUS, A TUBULAR MANDREL MOVABLY DISPOSED IN THE STRING FOR LONGITUDINAL MOVEMENT THEREIN, MEANS FORMING A SEAL BETWEEN THE EXTERNAL SURFACE OF THE MANDREL AND THE INTERNAL WALL OF THE STRING, VALVE MEANS MOVABLY POSITIONED IN STRING FOR LONGITUDINAL MOVEMENT THEREIN IN ONE DIRECTION TO POSITION THE VALVE MEANS TO RESTRICT THE FLOW OF FLUID THROUGH THE MANDREL AND IN THE OTHER DIRECTION TO POSITION THE VALVE MEANS TO OPEN THE MANDREL TO UNRESTRICTED FLOW OF FLUID THERETHROUGH, MEANS FOR RESISTING MOVEMENT OF MANDREL
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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) | 1968-05-24 | 1968-11-23 | 1969-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-24 | 1972-11-23 | 1973-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-24 | 1976-11-23 | 1977-05-25 | $7700.00 | Window Closed / Lapsed |