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Patent US3028333A successfully refreshed from Google Patents.
US3028333A
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Drilling fluid
Assignee: Phillips Petroleum Co
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Filing: 1958-04-03
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Granted: 1962-04-03
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Expires: 1978-04-03
Abstract
No abstract record available.
Inventors
- 👤 Charles A Stratton
- 👤 Armin C Pitchford
- 👤 Jr Homer J Sarrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:58
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/03; C09K8/035
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
IN A PROCESS OF DRILLING A WELL WITH WELL DRILLING TOOLS THE STEP OF CIRCULATING IN SAID WELL A DRILLING FLUID CONTAINING A SALT SELECTED FROM THE GROUP CONSISTING OF THE AMMONIUM AND ALKALI METAL SALTS OF SULFONATED ASPHALT IN AN AMOUNT SUFFICIENT TO REDUCE THE FILTRATION RATE OF SAID DRILLING FLUID.
Claim 2
Dependent Claim
52 words
IN A PROCESS OF DRILLING A WELL WITH WELL DRILLING TOOLS THE STEP OF CIRCULATING IN SAID WELL A DRILLING FLUID CONTAINING A SALT SELECTED FROM THE GROUP CONSISTING OF THE AMMONIUM AND ALKALI METAL SALTS OF SULFONATED ASPHALT IN AN AMOUNT SUFFICIENT TO REDUCE THE FILTRATION RATE OF SAID DRILLING FLUID.
References Cited (Backward Citations)
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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) | 1965-04-02 | 1965-10-02 | 1966-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-02 | 1969-10-02 | 1970-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-02 | 1973-10-02 | 1974-04-03 | $7700.00 | Window Closed / Lapsed |