US2525783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of well-drilling fluids
Assignee: NL Industries Inc
•
Filing: 1946-04-06
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Granted: 1950-10-17
•
Expires: 1966-04-06
Abstract
No abstract record available.
Inventors
- 👤 John R Farrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:31
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
A COMPOSITION FOR THE TREATMENT OF AMYLACEOUS-COLLOID-LADEN WELL-DRILLING FLUIDS, CONSISTING OF AS ESSENTIAL INGREDIENTS, SUBSTANTIALLY 50 PARTS OF FORMALDEHYDE OF A CLASS CONSISTING OF PARAFORMALDEHYDE AND TRIOXYMETHYLENE AND 40 PARTS OF A WATER-SOLUBLE BORATE.
Claim 2
Dependent Claim
34 words
A COMPOSITION FOR THE TREATMENT OF AMYLACEOUS-COLLOID-LADEN WELL-DRILLING FLUIDS, CONSISTING OF AS ESSENTIAL INGREDIENTS, SUBSTANTIALLY 50 PARTS OF FORMALDEHYDE OF A CLASS CONSISTING OF PARAFORMALDEHYDE AND TRIOXYMETHYLENE AND 40 PARTS OF A WATER-SOLUBLE BORATE.
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) | 1953-10-16 | 1954-04-17 | 1954-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-16 | 1958-04-17 | 1958-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-16 | 1962-04-17 | 1962-10-17 | $7700.00 | Window Closed / Lapsed |