Patent US2935473A successfully refreshed from Google Patents.
US2935473A
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Drilling fluid composition and process
Assignee: Puget Sound Pulp and Timber Co
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Filing: 1959-05-25
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Granted: 1960-05-03
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Expires: 1979-05-25
Abstract
No abstract record available.
Inventors
- 👤 King Ellis Gray
- 👤 Adolphson Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:47
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/203; Y; Y10; Y10S; Y10S71/00; Y10S71/903
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
48 words
A DRILLING FLUID COMPOSITION COMPRISING A SUSPENSION OF A CLAYEY MATERIAL IN AN AQUEOUS MEDIUM CONTAINING AN EFFECTIVE DISPERSING AMOUNT OF A SOLUBLE, OXIDIZED SALT OF A SULFONATED LIGNIN-CONTAINING MATERIAL, SAID SALT HAVING A CATION SELECTED FROM THE GROUP CONSISTING OF IRON, ALUMINUM, CHROMIUM, COPPER AND MIXTURES THEREOF.
Claim 2
Dependent Claim
48 words
A DRILLING FLUID COMPOSITION COMPRISING A SUSPENSION OF A CLAYEY MATERIAL IN AN AQUEOUS MEDIUM CONTAINING AN EFFECTIVE DISPERSING AMOUNT OF A SOLUBLE, OXIDIZED SALT OF A SULFONATED LIGNIN-CONTAINING MATERIAL, SAID SALT HAVING A CATION SELECTED FROM THE GROUP CONSISTING OF IRON, ALUMINUM, CHROMIUM, COPPER AND MIXTURES THEREOF.
Claim 3
Dependent Claim
89 words
A DRILLING FLUID COMPOSITION COMPRISING AN AQUEOUS SUSPENSION OF A CLAYEY MATERIAL THINNED BY A SOLUBLE ADDITIVE PREPARED FROM SULFONATED LIGNIN-CONTAINING MATERIAL OBTAINED FROM SPENT SULFITE LIQUOR BY A PROCESS WHICH COMPRISES TRATING SAID SULFONATED LIGNIN-CONTAINING MATERIAL IN AQUEOUS SOLUTION WITH A METAL ION SELECTED FROM THE GROUP CONSISTING OF IRON, ALUMINUM, CHROMIUM, COPPER AND MIXTURES THEREOF SAID METAL ION BEING ADDED IN AN AMOUNT EFFECTIVE TO PRODUCE SAID THINNING, AND SAID METAL ION AND SAID SULFONATED LIGNIN CONTAINING MATERIAL BEING CAPABLE UPON DRYING THEREOF OF FORMING A SALT.
Claim 4
Dependent Claim
89 words
A DRILLING FLUID COMPOSITION COMPRISING AN AQUEOUS SUSPENSION OF A CLAYEY MATERIAL THINNED BY A SOLUBLE ADDITIVE PREPARED FROM SULFONATED LIGNIN-CONTAINING MATERIAL OBTAINED FROM SPENT SULFITE LIQUOR BY A PROCESS WHICH COMPRISES TRATING SAID SULFONATED LIGNIN-CONTAINING MATERIAL IN AQUEOUS SOLUTION WITH A METAL ION SELECTED FROM THE GROUP CONSISTING OF IRON, ALUMINUM, CHROMIUM, COPPER AND MIXTURES THEREOF SAID METAL ION BEING ADDED IN AN AMOUNT EFFECTIVE TO PRODUCE SAID THINNING, AND SAID METAL ION AND SAID SULFONATED LIGNIN CONTAINING MATERIAL BEING CAPABLE UPON DRYING THEREOF OF FORMING A SALT.
Claim 5
Dependent Claim
50 words
A DRILLING FLUID COMPOSITION COMPRISING A SUSPENSION OF A CLAYEY MATERIAL IN AN AQUEOUS MEDIUM CONTAINING AN EFFECTIVE DISPERSING AMOUNT OF A SOLUBLE ADDITIVE PREPARED BY A PROCESS WHICH COMPRISES OXIDIZING A SULFONATED LIGNIN-CONTAINING MATERIAL WITH AN OXIDIZING AGENT HAVING AN OXIDIZING POWER STRONGER THAN AN OXIDATION POTENTIAL OF ABOUT-1.3.
Claim 6
Dependent Claim
50 words
A DRILLING FLUID COMPOSITION COMPRISING A SUSPENSION OF A CLAYEY MATERIAL IN AN AQUEOUS MEDIUM CONTAINING AN EFFECTIVE DISPERSING AMOUNT OF A SOLUBLE ADDITIVE PREPARED BY A PROCESS WHICH COMPRISES OXIDIZING A SULFONATED LIGNIN-CONTAINING MATERIAL WITH AN OXIDIZING AGENT HAVING AN OXIDIZING POWER STRONGER THAN AN OXIDATION POTENTIAL OF ABOUT-1.3.
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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) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |