Patent US2590814A successfully refreshed from Google Patents.
US2590814A
Expired / Lapsed
US
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Deep well treatment
Assignee: Dow Chemical Co
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Filing: 1949-04-21
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Granted: 1952-03-25
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Expires: 1969-04-21
Abstract
No abstract record available.
Inventors
- 👤 Paul H Cardwell
- 👤 Jr Albert W Coulter
- 👤 Harry H Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:45
CPC Classifications
E; E21; E21B; E21B43/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
IN THE TREATMENT OF A DEEP WELL, PROVIDED WITH THE USUAL TUBING STRING AND HAVING A COLUMN OF LIQUID IN THE SAID TUBING STRING, WITH A LIQUID AGENT WHICH IS IMMISCIBLE WITH AND OF HIGHER SPECIFIC GRAVITY THAN THE LIQUID OF THE SAID COLUMN OF LIQUID AND CAPABLE OF PENETRATING AN EARTH FORMATION, THE METHOD OF PREVENTING THE LIQUID AGENT FROM DESCENDING THROUGH AND MIXING WITH THE LIQUID OF THE SAID COLUMN OF LIQUID ON BEING DEPOSITED IN THE SAID TUBING STRING WHICH CONSISTS IN DEPOSITING UPON THE SAID COLUNM OF LIQUID, ANOTHER LIQUID WHICH IS MISCIBLE WITH THE LIQUID OF THE SAID COLUMN OF LIQUID AND OF HIGHER SPECIFIC GRAVITY THAN THE LIQUID AGENT IN AMOUNT SUFFICIENT TO INCREASE THE SPECIFIC GRAVITY OF AT LEAST THE UPPER PORTION OF THE SAID COLUMN OF LIQUID TO A VALUE ABOUT THAT OF THE SAID LIQUID AGENT, AND THEREAFTER INTRODUCING INTO THE TUBING STRING, THE SAID LIQUID AGENT.
Claim 2
Dependent Claim
156 words
IN THE TREATMENT OF A DEEP WELL, PROVIDED WITH THE USUAL TUBING STRING AND HAVING A COLUMN OF LIQUID IN THE SAID TUBING STRING, WITH A LIQUID AGENT WHICH IS IMMISCIBLE WITH AND OF HIGHER SPECIFIC GRAVITY THAN THE LIQUID OF THE SAID COLUMN OF LIQUID AND CAPABLE OF PENETRATING AN EARTH FORMATION, THE METHOD OF PREVENTING THE LIQUID AGENT FROM DESCENDING THROUGH AND MIXING WITH THE LIQUID OF THE SAID COLUMN OF LIQUID ON BEING DEPOSITED IN THE SAID TUBING STRING WHICH CONSISTS IN DEPOSITING UPON THE SAID COLUNM OF LIQUID, ANOTHER LIQUID WHICH IS MISCIBLE WITH THE LIQUID OF THE SAID COLUMN OF LIQUID AND OF HIGHER SPECIFIC GRAVITY THAN THE LIQUID AGENT IN AMOUNT SUFFICIENT TO INCREASE THE SPECIFIC GRAVITY OF AT LEAST THE UPPER PORTION OF THE SAID COLUMN OF LIQUID TO A VALUE ABOUT THAT OF THE SAID LIQUID AGENT, AND THEREAFTER INTRODUCING INTO THE TUBING STRING, THE SAID LIQUID AGENT.
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) | 1955-03-25 | 1955-09-24 | 1956-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-25 | 1959-09-24 | 1960-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-25 | 1963-09-24 | 1964-03-25 | $7700.00 | Window Closed / Lapsed |