US3046221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally stable attapulgite-base drilling mud
Assignee: Pure Oil Co
•
Filing: 1958-12-22
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Granted: 1962-07-24
•
Expires: 1978-12-22
Abstract
No abstract record available.
Inventors
- 👤 Charles G Dodd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:43
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/26; C09K8/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
AN OIL-EMULSION BASE, ATTAPULGITE CLAY, DRILLING MUD FOR USE AT HIGH TEMPERATURES COMPRISING AN ALKALINE OILIN-WATER EMULSION PHASE, AND ATTAPULGITE CLAY DISPERSED IN SAID EMULSION PHASE AND A DISPERSING AGENT FOR SAID CLAY, A SMALL AMOUNT OF A HIGH MOLECULAR WEIGHT, NON-IONIC, POLYSACCHARIDE SUFFICIENT TO RESTRICT WATER LOSS TO A VALUE LESS THAN 30 ML. PER 30 MINUTES MEASURED IN ACCORDANCE WITH API CODE #29, SAID POLYSACCHARIDE HAVING A MOLECULAR WEIGHT IN EXCESS OF ABOUT 50,000 AND BEING WATER SOLUBLE AND A MAGNESIUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM OXIDE, MAGNESIUM HYDROXIDE, AND MAGNESIUM CARBONATE IN AN AMOUNT SUFFICCIENT TO INHIBIT DECOMPOSITION OF THE CLAY AT ELEVATED TEMPERATURES.
Claim 2
Dependent Claim
110 words
AN OIL-EMULSION BASE, ATTAPULGITE CLAY, DRILLING MUD FOR USE AT HIGH TEMPERATURES COMPRISING AN ALKALINE OILIN-WATER EMULSION PHASE, AND ATTAPULGITE CLAY DISPERSED IN SAID EMULSION PHASE AND A DISPERSING AGENT FOR SAID CLAY, A SMALL AMOUNT OF A HIGH MOLECULAR WEIGHT, NON-IONIC, POLYSACCHARIDE SUFFICIENT TO RESTRICT WATER LOSS TO A VALUE LESS THAN 30 ML. PER 30 MINUTES MEASURED IN ACCORDANCE WITH API CODE #29, SAID POLYSACCHARIDE HAVING A MOLECULAR WEIGHT IN EXCESS OF ABOUT 50,000 AND BEING WATER SOLUBLE AND A MAGNESIUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM OXIDE, MAGNESIUM HYDROXIDE, AND MAGNESIUM CARBONATE IN AN AMOUNT SUFFICCIENT TO INHIBIT DECOMPOSITION OF THE CLAY AT ELEVATED TEMPERATURES.
References Cited (Backward Citations)
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Cited
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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) | 1965-07-23 | 1966-01-22 | 1966-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-23 | 1970-01-22 | 1970-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-23 | 1974-01-22 | 1974-07-24 | $7700.00 | Window Closed / Lapsed |