US3741894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemically modified organic polymers
Assignee: ExxonMobil Upstream Research Co
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Filing: 1970-06-08
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Granted: 1973-06-26
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Expires: 1990-06-08
Abstract
Abstract LONG CHAIN WATER-SOLUBLE ORGANIC POLYMERS HAVING HYDROXYL GROUPS LOCATED AT B POSITIONS WITH RESPECT TO ONE ANOTHER ARE REACTED WITH A-KETO CARBOXYLIC ACIDS UNDER AQUEOUS CONDITIONS TO FORM MODIFIED POLYMERS USEFUL IN THE PREPARATION OF AILFIELD DRILLING FLUIDS AND SIMILAR COMPOSITIONS.
Inventors
- 👤 S Storfer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:58
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0024; C08B37/006; C08B37/0087; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24; Y; Y10; Y10S; Y10S507/00; Y10S507/903; Y10S507/904; Y10S507/925
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |