US3072569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling fluid compositions
Assignee: Wyeth Holdings LLC
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Filing: 1960-08-15
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Granted: 1963-01-08
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Expires: 1980-08-15
Abstract
No abstract record available.
Inventors
- 👤 Siegele Frederick Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:53
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A DRILLING FLUID COMPRISING A MAJOR AMOUNT OF AN AQUEOUS CLAY DISPERSION OF A HIGH CALCIUM CONTENT CONTAINING AT LEAST 500 PARTS PER MILLION IN THE FORM OF CALCIUM IONS AND, AS FLUID LOSS CONTROL AGENT, A MINOR AMOUNT OF A SUBSTANTIALLY HOMOGENEOUS LINEAR HYDROCARBON CHAIN POLYMER HAVING A SPECIFIC VISCOSITY VALUE OF FROM ABOUT 0.4 TO 2.0 AND CONTAINING HYDROXYL AND CARBOXYLIC ACID GROUPS IN A MOLAR RATIO OF FROM ABOUT 70-90 TO 30-10, RESPECTIVELY, WHEREBY WATERLOSS DUE TO THE USE OF ELEVATED TEMPERATURES ABOVE 300*F. AND A HIGH CALCIUM CONTENT MUD IS MARKEDLY REDUCED.
Claim 2
Dependent Claim
96 words
A DRILLING FLUID COMPRISING A MAJOR AMOUNT OF AN AQUEOUS CLAY DISPERSION OF A HIGH CALCIUM CONTENT CONTAINING AT LEAST 500 PARTS PER MILLION IN THE FORM OF CALCIUM IONS AND, AS FLUID LOSS CONTROL AGENT, A MINOR AMOUNT OF A SUBSTANTIALLY HOMOGENEOUS LINEAR HYDROCARBON CHAIN POLYMER HAVING A SPECIFIC VISCOSITY VALUE OF FROM ABOUT 0.4 TO 2.0 AND CONTAINING HYDROXYL AND CARBOXYLIC ACID GROUPS IN A MOLAR RATIO OF FROM ABOUT 70-90 TO 30-10, RESPECTIVELY, WHEREBY WATERLOSS DUE TO THE USE OF ELEVATED TEMPERATURES ABOVE 300*F. AND A HIGH CALCIUM CONTENT MUD IS MARKEDLY REDUCED.
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) | 1966-01-07 | 1966-07-09 | 1967-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-07 | 1970-07-09 | 1971-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-07 | 1974-07-09 | 1975-01-08 | $7700.00 | Window Closed / Lapsed |