US2749309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drilling fluids
Assignee: Weyerhaeuser Timber Co
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Filing: 1951-08-16
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Granted: 1956-06-05
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Expires: 1971-08-16
Abstract
No abstract record available.
Inventors
- 👤 Clark C Heritage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:33
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/203; C09K8/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
AN AQUEOUS DRILLING MUD MADE OF UP A MAJOR PROPORTION OF A SUSPENSION OF WATER INSOLUBLE CLAYEY MATERIAL IN WATER AND AN AMOUNT OF A MIXTURE OF AN ALKALI METAL HYDROXIDE AND A SEPARATED COMPONENT OF THE BARK OF A CONIFFEROUS TREE OF THE PINE, TSUGA, PSEUDOTSUGA AND FIR FAMILIES SELECTED FROM THE GROUP CONSISTING OF SCLERENCHYMA TISSUE, PARENCHYMA TISSUE, CORK AND ADMIXTURES THEREOF, THE BARK COMPONENT BEING PRESENT IN THE RANGE OF FROM 0.35 POUND TO ABOUT 10 POUNDS PER BARREL OF FLUID.
Claim 2
Dependent Claim
84 words
AN AQUEOUS DRILLING MUD MADE OF UP A MAJOR PROPORTION OF A SUSPENSION OF WATER INSOLUBLE CLAYEY MATERIAL IN WATER AND AN AMOUNT OF A MIXTURE OF AN ALKALI METAL HYDROXIDE AND A SEPARATED COMPONENT OF THE BARK OF A CONIFFEROUS TREE OF THE PINE, TSUGA, PSEUDOTSUGA AND FIR FAMILIES SELECTED FROM THE GROUP CONSISTING OF SCLERENCHYMA TISSUE, PARENCHYMA TISSUE, CORK AND ADMIXTURES THEREOF, THE BARK COMPONENT BEING PRESENT IN THE RANGE OF FROM 0.35 POUND TO ABOUT 10 POUNDS PER BARREL OF FLUID.
References Cited (Backward Citations)
US1999766A
Cited
US2109858A
Cited
US2280995A
Cited
GB605173A
Cited
US2549142A
Cited
US2601050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |