US2739940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling fluid additive and methods for using the same
Assignee: Phillips Petroleum Co
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Filing: 1952-12-18
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Granted: 1956-03-27
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Expires: 1972-12-18
Abstract
No abstract record available.
Inventors
- 👤 Herbert M Barrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:15
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/003; Y; Y10; Y10S; Y10S507/00; Y10S507/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
A WELL DRILLING FLUID COMPRISING SUFFICIENT FLUID THAT THE WELL DRILLING FLUID IS PUMPABLE AND DUFFICIENT ROCK WOOL THAT THE LOSS OF THE DRILLING FLUID, WHEN CIRCULATED IN A WELL BORE, IS DECREASED.
Claim 2
Dependent Claim
33 words
A WELL DRILLING FLUID COMPRISING SUFFICIENT FLUID THAT THE WELL DRILLING FLUID IS PUMPABLE AND DUFFICIENT ROCK WOOL THAT THE LOSS OF THE DRILLING FLUID, WHEN CIRCULATED IN A WELL BORE, IS DECREASED.
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) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |