US3347788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of products used for the control of viscosity and water absorption of drilling fluids
Assignee: ZELLSTOFFFABRICK WALDHOF
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Filing: 1966-12-20
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Granted: 1967-10-17
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Expires: 1986-12-20
Abstract
No abstract record available.
Inventors
- 👤 Sohn August Wilhelm
- 👤 Erasmus Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:59
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/03; C09K8/035; C09K8/20; C09K8/203
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A DRILLING FLUID CONSISTING ESSENTIALLY OF A HYDRATABLE SWELLING CLAY AND AN AMOUNT SUFFICIENT TO CONTROL VISCOSITY AND WATER ABSORPTION OF A PRETREATED SULFITE LIQUOR IN AQUEOUS DISPERSION, SAID PRETREATED SULFITE LIQUOR BEING THE PRODUCT FORMED BY REACTING WASTE SULFITE LIQUOR, SAID LIQUOR BEING FREED BY SUGARS BY FERMENTATION, AT TEMPERATURES OF BETWEEN ABOUT 50 AND 100*C., WITH 5 TO 12 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF SAID LIQUOR OF CHROMIUM-III SULFATES AND 0.5 TO 3 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF SAID LIQUOR OF A SULFATE SELECTED FROM THE GROUP CONSISTING OF IRON-II AND IRON-III SULFATES AND MIXTURES OF SAID IRON SULFATES, THE AMOUNT OF CATIONIC IRON IN THE SULFITE LIQUOR PRODUCT BEING 1 TO 2.7% FE2O3 BASED ON THE DRY PRODUCT, DRYING AND PULVERIZING SAID PRODUCT, AND REHEATING AT A TEMPERATURE BETWEEN ABOUT 100 AND 200*C.
Claim 2
Dependent Claim
144 words
A DRILLING FLUID CONSISTING ESSENTIALLY OF A HYDRATABLE SWELLING CLAY AND AN AMOUNT SUFFICIENT TO CONTROL VISCOSITY AND WATER ABSORPTION OF A PRETREATED SULFITE LIQUOR IN AQUEOUS DISPERSION, SAID PRETREATED SULFITE LIQUOR BEING THE PRODUCT FORMED BY REACTING WASTE SULFITE LIQUOR, SAID LIQUOR BEING FREED BY SUGARS BY FERMENTATION, AT TEMPERATURES OF BETWEEN ABOUT 50 AND 100*C., WITH 5 TO 12 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF SAID LIQUOR OF CHROMIUM-III SULFATES AND 0.5 TO 3 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF SAID LIQUOR OF A SULFATE SELECTED FROM THE GROUP CONSISTING OF IRON-II AND IRON-III SULFATES AND MIXTURES OF SAID IRON SULFATES, THE AMOUNT OF CATIONIC IRON IN THE SULFITE LIQUOR PRODUCT BEING 1 TO 2.7% FE2O3 BASED ON THE DRY PRODUCT, DRYING AND PULVERIZING SAID PRODUCT, AND REHEATING AT A TEMPERATURE BETWEEN ABOUT 100 AND 200*C.
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) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |