US3086938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling mud removal
Assignee: Dow Chemical Co
•
Filing: 1958-09-02
•
Granted: 1963-04-23
•
Expires: 1978-09-02
Abstract
No abstract record available.
Inventors
- 👤 James O Means
- 👤 Jr Paul E Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:25
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/52; C09K8/528; Y; Y10; Y10S; Y10S507/00; Y10S507/927; Y10S507/928
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A METHOD OF REMOVING RESIDUAL DRILLING MUD FROM A WELLBORE AND THE PORTIONS OF THE FORMATION IMMEDIATELY ADJACENT THERETO CONSISTING OF INJECTING DOWN THE WELLBORE AND INTO CONTACT WITH SAID RESIDUAL DRILLING MUD THE COMPOSITION CONSISTING ESSENTIALLY OF AN ADMIXTURE OF (1) A HYDROCARBON OIL; (2) A CATIONIC NITROGENOUS COMPONENT SELECTED FROM THE CLASS CONSISTING OF (A) AN ALKYL QUATERNARY AMMONIUM HALIE SALT HAVING THE GENERAL FORMULA:
Claim 2
Independent Claim
67 words
A METHOD OF REMOVING RESIDUAL DRILLING MUD FROM A WELLBORE AND THE PORTIONS OF THE FORMATION IMMEDIATELY ADJACENT THERETO CONSISTING OF INJECTING DOWN THE WELLBORE AND INTO CONTACT WITH SAID RESIDUAL DRILLING MUD THE COMPOSITION CONSISTING ESSENTIALLY OF AN ADMIXTURE OF (1) A HYDROCARBON OIL; (2) A CATIONIC NITROGENOUS COMPONENT SELECTED FROM THE CLASS CONSISTING OF (A) AN ALKYL QUATERNARY AMMONIUM HALIE SALT HAVING THE GENERAL FORMULA:
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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) | 1966-04-22 | 1966-10-22 | 1967-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-22 | 1970-10-22 | 1971-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-22 | 1974-10-22 | 1975-04-23 | $7700.00 | Window Closed / Lapsed |