US2773670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling fluid composition and method
Assignee: Hughes Tool Co
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Filing: 1952-06-09
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Granted: 1956-12-11
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Expires: 1972-06-09
Abstract
No abstract record available.
Inventors
- 👤 Miller George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:46
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/003; C; C09; C09K; C09K8/00; C09K8/02; C09K8/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A DRILLING FLUID COMPOSITION COMPRISING AN OIL BASE DRILLING FLUID HAVING ADDED THERETO DISCRETE PARTICLES OF ASPHALT HAVING A PENETRATION AT 25* C. OF FROM 0 TO ABOUT 3 AND A MELTING POINT OF FROM ABOUT 250* F. TO ABOUT 320* F., SAID ASPHALT PARTICLES BEING SLOWLY SOLUBLE IN HYDROCARBONS AND ADAPTED TO BE BONDED TOGETHER TO FORM A MUDSHEATH WHEN EXPOSED TO THE TEMPERATURE AND PRESSURE CONDITIONS EXISTING IN A WELL HOLE.
Claim 2
Dependent Claim
73 words
A DRILLING FLUID COMPOSITION COMPRISING AN OIL BASE DRILLING FLUID HAVING ADDED THERETO DISCRETE PARTICLES OF ASPHALT HAVING A PENETRATION AT 25* C. OF FROM 0 TO ABOUT 3 AND A MELTING POINT OF FROM ABOUT 250* F. TO ABOUT 320* F., SAID ASPHALT PARTICLES BEING SLOWLY SOLUBLE IN HYDROCARBONS AND ADAPTED TO BE BONDED TOGETHER TO FORM A MUDSHEATH WHEN EXPOSED TO THE TEMPERATURE AND PRESSURE CONDITIONS EXISTING IN A WELL HOLE.
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) | 1959-12-11 | 1960-06-11 | 1960-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-11 | 1964-06-11 | 1964-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-11 | 1968-06-11 | 1968-12-11 | $7700.00 | Window Closed / Lapsed |