US2944018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition and process for preventing or restoring lost circulation
Assignee: Individual
•
Filing: 1956-10-22
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Granted: 1960-07-05
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Expires: 1976-10-22
Abstract
No abstract record available.
Inventors
- 👤 Borcherdt Bert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:37
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A DRILLING FLUID COMPRISING A LIQUID BASE, A LOSTCIRCULATION MATERIAL, AND A BRIDGE-INITIATING AGENT, SAID AGENT COMPRISING A PLURALITY OF WEDGE-LIKE PARTICLES OF A RUBBER-LIKE MATERIAL CAPABLE OF BEING SUSPENDED IN SAID DRILLING FLUID AND BEING CAPABLE OF BEING SUSPENDED IN SAID SHAPE WHEN EXPOSED TO SAID FLUID AND TO THE TEMPERATURE AND PRESSURE CONDITIONS OF USE, SAID WEDGE,LIKE PARTICLES HAVING AT LEAST ONE END PORTION DEFINED BY SURFACES CONVERGING TO FORM AN ACUTE ANGLE, SAID SURFACES OF SAID END PORTION CONVERGING FROM A PORTION HAVING A MINIMUM DIMENSION OF AT LEAST ABOUT ONE-QUARTER INCH, AND NO LESS THAN ABOT ONE-EIGHT OF SAID PARTICLES BEING OF SUBSTANTIALLY THE SAME SIZE AND SHAPE.
Claim 2
Dependent Claim
112 words
A DRILLING FLUID COMPRISING A LIQUID BASE, A LOSTCIRCULATION MATERIAL, AND A BRIDGE-INITIATING AGENT, SAID AGENT COMPRISING A PLURALITY OF WEDGE-LIKE PARTICLES OF A RUBBER-LIKE MATERIAL CAPABLE OF BEING SUSPENDED IN SAID DRILLING FLUID AND BEING CAPABLE OF BEING SUSPENDED IN SAID SHAPE WHEN EXPOSED TO SAID FLUID AND TO THE TEMPERATURE AND PRESSURE CONDITIONS OF USE, SAID WEDGE,LIKE PARTICLES HAVING AT LEAST ONE END PORTION DEFINED BY SURFACES CONVERGING TO FORM AN ACUTE ANGLE, SAID SURFACES OF SAID END PORTION CONVERGING FROM A PORTION HAVING A MINIMUM DIMENSION OF AT LEAST ABOUT ONE-QUARTER INCH, AND NO LESS THAN ABOT ONE-EIGHT OF SAID PARTICLES BEING OF SUBSTANTIALLY THE SAME SIZE AND SHAPE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-05 | 1964-01-04 | 1964-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-05 | 1968-01-04 | 1968-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-05 | 1972-01-04 | 1972-07-05 | $7700.00 | Window Closed / Lapsed |