US2658035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of drilling muds with barium starch
Assignee: NL Industries Inc
•
Filing: 1949-11-16
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Granted: 1953-11-03
•
Expires: 1969-11-16
Abstract
No abstract record available.
Inventors
- 👤 Harold E Bode
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:16
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/206
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
AN AQUEOUS WELL-DRILLING-FLUID CONTAINING A SMALL PERCENTAGE OF AN INSOLUBLE, ANION ACTIVATABLE, AMYLOPECTIN COMPLEX OF A METAL OF A GROUP CONSISTING OF BARIUM, ALUMINUM AND ZINC IN AN AMOUNT SUFFICIENT ATTAIN A LOW WATER-LOSS.
Claim 2
Dependent Claim
34 words
AN AQUEOUS WELL-DRILLING-FLUID CONTAINING A SMALL PERCENTAGE OF AN INSOLUBLE, ANION ACTIVATABLE, AMYLOPECTIN COMPLEX OF A METAL OF A GROUP CONSISTING OF BARIUM, ALUMINUM AND ZINC IN AN AMOUNT SUFFICIENT ATTAIN A LOW WATER-LOSS.
References Cited (Backward Citations)
US2270006A
Cited
US2200710A
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US2417307A
Cited
US2481545A
Cited
US2554214A
Cited
US2557473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |