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Patent US3766983A successfully refreshed from Google Patents.
US3766983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized nonionic polysaccharide thickened water
Assignee: Shell USA Inc
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Filing: 1972-05-15
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Granted: 1973-10-23
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Expires: 1992-05-15
Abstract
Abstract A reservoir oil displacing fluid that is relatively stable toward multivalent metal ions comprises an aqueous liquid solution of a viscosity enhancing amount of a water soluble nonionic polysaccharide and an effective amount of a water soluble metal salt adapted to clarify a calcium ion induced turbidity in that solution.
Inventors
- 👤 Y Chiu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:35
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/84; C09K8/86; C09K8/88; C09K8/90; C09K8/905
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
18 words
The process of claim 1 in which said turbidity clarifying salt is a salt of a trivalent metal.
Claim 2
Dependent Claim
13 words
The process of claim 2 in which said salt is an iron salt.
Claim 3
Dependent Claim
12 words
The process of claim 2 in which said salt is an aluminum.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |