Patent US3232870A successfully refreshed from Google Patents.
US3232870A
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US
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Process of drilling a well
Assignee: NL Industries Inc
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Filing: 1962-12-17
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Granted: 1966-02-01
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Expires: 1982-12-17
Abstract
No abstract record available.
Inventors
- 👤 Jack C Cowan
- 👤 Jr Augustus Earl Beasley
- 👤 Robert O Stearns
- 👤 John W Jordan
- 👤 Finlayson Claude Malcolm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:02
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/32; Y; Y10; Y10S; Y10S507/00; Y10S507/91; Y10S516/00; Y10S516/01; Y10S516/03; Y10S516/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A PROCESS OF DRILLING A WELL BY A ROTARY METHOD IN WHICH AN OIL-BASE DRILLING FLUID IS CIRCULATED FROM THE SURFACE OF THE WELL DOWN TO THE BOTTOM OF A DRILLING STRING AND UPWARDLY WITHIN THE BORE HOLE TO THE SURFACE, IN WHICH THE SAID FLUID HAS A CONTINUOUS PHASE OF OIL, IN WHICH AN ALKYL AMMONIUM LIGNOSULFONATE HAVING A HYDROCARBON CHAIN OF 12 TO 22 CARBON ATOMS IN A STRAIGHT CHAIN IS ADDED TO SAID LIQUID DURING THE COURSE OF SAID DRILLING SO AS TO REDUCE THE FILTRABILITY OF SAID LIQUID TO A PREDETERMINED VALUE AND TO MAINTAIN IT BELOW SAID PREDETERMINED VALUE BY REPEATED ADDITIONS DURING THE COURSE OF SAID DRILLING.
Claim 2
Dependent Claim
113 words
A PROCESS OF DRILLING A WELL BY A ROTARY METHOD IN WHICH AN OIL-BASE DRILLING FLUID IS CIRCULATED FROM THE SURFACE OF THE WELL DOWN TO THE BOTTOM OF A DRILLING STRING AND UPWARDLY WITHIN THE BORE HOLE TO THE SURFACE, IN WHICH THE SAID FLUID HAS A CONTINUOUS PHASE OF OIL, IN WHICH AN ALKYL AMMONIUM LIGNOSULFONATE HAVING A HYDROCARBON CHAIN OF 12 TO 22 CARBON ATOMS IN A STRAIGHT CHAIN IS ADDED TO SAID LIQUID DURING THE COURSE OF SAID DRILLING SO AS TO REDUCE THE FILTRABILITY OF SAID LIQUID TO A PREDETERMINED VALUE AND TO MAINTAIN IT BELOW SAID PREDETERMINED VALUE BY REPEATED ADDITIONS DURING THE COURSE OF SAID DRILLING.
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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) | 1969-01-31 | 1969-08-02 | 1970-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-31 | 1973-08-02 | 1974-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-31 | 1977-08-02 | 1978-02-01 | $7700.00 | Window Closed / Lapsed |