US2813826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation and use of drilling fluid treating agents
Assignee: Gulf Research and Development Co
•
Filing: 1953-12-29
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Granted: 1957-11-19
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Expires: 1973-12-29
Abstract
No abstract record available.
Inventors
- 👤 Edgar I Crowley
- 👤 Norman W Franke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:23
CPC Classifications
C; C08; C08H; C08H6/00; C09; C09K; C09K8/00; C09K8/02; C09K8/03; C09K8/032
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
THE PROCESS OF PREPARING DRILLING FLUID TREATING AGENTS COMPRISING REACTING A LIGNITIC MATERIAL WITH MOLECULAR OXYGEN AND AN AQUEOUS ALKALINE SOLUTION AT AN ELEVATED TEMPERATURE AND SUPERATMOSPHERIC PRESSURE, REMOVING SOLIDS FROM THE LIQUID PRODUCTS OF SUCH REACTION, ACIDIFYING SAID LIQUID PRODUCTS OF SUCH REACTION TO PRECIPITATE SOLID ACIDS, REMOVING THE PRECIPITATED SOLID ACIDS FROM THE RESULTING SOLUTION AS THE FIRST TREATING AGENT, EXTRACTING SAID RESULTING SOLUTION WITH AN ETHER CONTAINING 4 TO 10 CARBON ATOMS, THEN EXTRACTING THE RESULTING RAFFINATE WITH A SOLVENT SELECTED FROM THE GROUP CONSISTING OF ALCOHOLS AND KETONES HAVING 4 TO 10 CARBON ATOMS, AND SEPARATELY RECOVERING THE SUBSTANCES EXTRACTED BY THE ETHER AND THE SOLVENT AS SECOND AND THIRD TREATING AGENTS RESPECTIVELY..
Claim 2
Dependent Claim
117 words
THE PROCESS OF PREPARING DRILLING FLUID TREATING AGENTS COMPRISING REACTING A LIGNITIC MATERIAL WITH MOLECULAR OXYGEN AND AN AQUEOUS ALKALINE SOLUTION AT AN ELEVATED TEMPERATURE AND SUPERATMOSPHERIC PRESSURE, REMOVING SOLIDS FROM THE LIQUID PRODUCTS OF SUCH REACTION, ACIDIFYING SAID LIQUID PRODUCTS OF SUCH REACTION TO PRECIPITATE SOLID ACIDS, REMOVING THE PRECIPITATED SOLID ACIDS FROM THE RESULTING SOLUTION AS THE FIRST TREATING AGENT, EXTRACTING SAID RESULTING SOLUTION WITH AN ETHER CONTAINING 4 TO 10 CARBON ATOMS, THEN EXTRACTING THE RESULTING RAFFINATE WITH A SOLVENT SELECTED FROM THE GROUP CONSISTING OF ALCOHOLS AND KETONES HAVING 4 TO 10 CARBON ATOMS, AND SEPARATELY RECOVERING THE SUBSTANCES EXTRACTED BY THE ETHER AND THE SOLVENT AS SECOND AND THIRD TREATING AGENTS RESPECTIVELY..
References Cited (Backward Citations)
US2545169A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-18 | 1961-05-20 | 1961-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-18 | 1965-05-20 | 1965-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-18 | 1969-05-20 | 1969-11-19 | $7700.00 | Window Closed / Lapsed |