Patent US2873251A successfully refreshed from Google Patents.
US2873251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-clay-reactive drilling fluid
Assignee: Pan American Petroleum Corp
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Filing: 1956-09-19
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Granted: 1959-02-10
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Expires: 1976-09-19
Abstract
No abstract record available.
Inventors
- 👤 Jr Frank O Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:08
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A DRILLING FLUID COMPRISING WATER, SUSPENDED SOLIDS, A MINOR AMOUNT OF A WATER-SOLUBLE SALT OF A WATER-SOLUBLE POLYAMINE SUFFICIENT TO RENDER THE DRILLING-FLUID FILTRATE SUBSTANTIALLY NON-CLAY-REACTIVE, AND A MINOR AMOUNT OF AT LEAST ONE CARBOXYLATED POLYMER SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL AND AMMONIUM CARBOXYMETHYLCELLULOSES AND POLYACRYLATES, SUFFICIENT TO RENDER THE FLUIDLOSS, VISCOSITY, AND GEL STRENGHT OF SAID FLUID SATISFACTORY FOR DRILLING.
Claim 2
Dependent Claim
64 words
A DRILLING FLUID COMPRISING WATER, SUSPENDED SOLIDS, A MINOR AMOUNT OF A WATER-SOLUBLE SALT OF A WATER-SOLUBLE POLYAMINE SUFFICIENT TO RENDER THE DRILLING-FLUID FILTRATE SUBSTANTIALLY NON-CLAY-REACTIVE, AND A MINOR AMOUNT OF AT LEAST ONE CARBOXYLATED POLYMER SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL AND AMMONIUM CARBOXYMETHYLCELLULOSES AND POLYACRYLATES, SUFFICIENT TO RENDER THE FLUIDLOSS, VISCOSITY, AND GEL STRENGHT OF SAID FLUID SATISFACTORY FOR DRILLING.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-09 | 1962-08-11 | 1963-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-09 | 1966-08-11 | 1967-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-09 | 1970-08-11 | 1971-02-10 | $7700.00 | Window Closed / Lapsed |