Patent US2002952A successfully refreshed from Google Patents.
Patent US3216514A successfully refreshed from Google Patents.
US3216514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary drilling apparatus
Assignee: Individual
•
Filing: 1962-02-23
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Granted: 1965-11-09
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Expires: 1982-02-23
Abstract
No abstract record available.
Inventors
- 👤 Fred B Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:58
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/18; E21B6/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
IN A ROTARY DRILLING APPARATUS, THE COMBINATION WITH A TUBULAR STRING ADAPTED TO BE LOWERED INTO A WELL BORE, A DRILLING BIT BODY ATTACHED TO THE LOWER END OF THE STRING FOR ROTATION THEREWITH AND CUTTER MEANS ROTATABLY MOUNTED ON THE BODY IN POSITION FOR ENGAGEMENT WITH THE BOTTOM ON THE BORE TO PERFORM A CUTTING OPERATION IN RESPONSE TO ROTATION OF THE STRING TO FORM AN ANNULUS ABOUT THE STRING, SAID BODY HAVING A PASSAGEWAY THERETHROUGH THROUGH WHICH FLUID MAY FLOW DOWNWARDLY THROUGH THE STRING AND UPWARDLY IN THE ANNULUS, OF MEANS ROTATABLY MOUNTED ON THE BODY FOR ROTATION INTO AND OUT OF A POSITION TO RESTRICT THE FLOW OF FLUID THROUGH THE BODY TO CAUSE AN INCREASE IN THE DOWNWARD FORCE EXERTED BY THE FLUID ON THE BODY AND MEANS ON SAID CUTTER MEANS AND SAID ROTATABLE MEANS POSITIONED FOR COACTION TO ROTATE SAID ROTATABLE MEANS IN RESPONSE TO ROTATIONAL MOVEMENT OF SAID CUTTER MEANS.
Claim 2
Dependent Claim
157 words
IN A ROTARY DRILLING APPARATUS, THE COMBINATION WITH A TUBULAR STRING ADAPTED TO BE LOWERED INTO A WELL BORE, A DRILLING BIT BODY ATTACHED TO THE LOWER END OF THE STRING FOR ROTATION THEREWITH AND CUTTER MEANS ROTATABLY MOUNTED ON THE BODY IN POSITION FOR ENGAGEMENT WITH THE BOTTOM ON THE BORE TO PERFORM A CUTTING OPERATION IN RESPONSE TO ROTATION OF THE STRING TO FORM AN ANNULUS ABOUT THE STRING, SAID BODY HAVING A PASSAGEWAY THERETHROUGH THROUGH WHICH FLUID MAY FLOW DOWNWARDLY THROUGH THE STRING AND UPWARDLY IN THE ANNULUS, OF MEANS ROTATABLY MOUNTED ON THE BODY FOR ROTATION INTO AND OUT OF A POSITION TO RESTRICT THE FLOW OF FLUID THROUGH THE BODY TO CAUSE AN INCREASE IN THE DOWNWARD FORCE EXERTED BY THE FLUID ON THE BODY AND MEANS ON SAID CUTTER MEANS AND SAID ROTATABLE MEANS POSITIONED FOR COACTION TO ROTATE SAID ROTATABLE MEANS IN RESPONSE TO ROTATIONAL MOVEMENT OF SAID CUTTER MEANS.
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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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |