US2600404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of well-drilling fluids
Assignee: NL Industries Inc
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Filing: 1948-07-13
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Granted: 1952-06-17
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Expires: 1968-07-13
Abstract
No abstract record available.
Inventors
- 👤 Raymond W Hoeppel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:15
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
75 words
IN THE ART OF DRILLING WELLS BY THE EMPLOYMENT OF AN AQUEOUS CLAY-LADEN STARCHY DRILLING FLUID SUBJECT TO CONTAMINATION BY STARCH-DEGRADING CONSTITUENTS, THE PROCESS COMPRISING, SUBJECTING AN UNGELATINIZED STARCHY MATERIAL TO THE ACTION OF A WATER-SALT BRINE OF A CONCENTRATION OF AT LEAST 16% BETWEEN AND AT A TEMPERATURE SUBSTANTIALLY BELOW THAT REQUIRED FOR FRESH WATER, BUT BOTH SUFFICIENT TO GELATINIZE THE STARCHY MATERIAL AND TO INHIBIT DEGRADATION OF THE STARCH IN THE DRILLING FLUID.
Claim 2
Dependent Claim
75 words
IN THE ART OF DRILLING WELLS BY THE EMPLOYMENT OF AN AQUEOUS CLAY-LADEN STARCHY DRILLING FLUID SUBJECT TO CONTAMINATION BY STARCH-DEGRADING CONSTITUENTS, THE PROCESS COMPRISING, SUBJECTING AN UNGELATINIZED STARCHY MATERIAL TO THE ACTION OF A WATER-SALT BRINE OF A CONCENTRATION OF AT LEAST 16% BETWEEN AND AT A TEMPERATURE SUBSTANTIALLY BELOW THAT REQUIRED FOR FRESH WATER, BUT BOTH SUFFICIENT TO GELATINIZE THE STARCHY MATERIAL AND TO INHIBIT DEGRADATION OF THE STARCH IN THE DRILLING FLUID.
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) | 1955-06-17 | 1955-12-17 | 1956-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-17 | 1959-12-17 | 1960-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-17 | 1963-12-17 | 1964-06-17 | $7700.00 | Window Closed / Lapsed |