Patent US3087923A successfully refreshed from Google Patents.
US3087923A
Expired / Lapsed
US
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Drilling fluid composition and process
Assignee: Puget Sound Pulp and Timber Co
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Filing: 1960-04-01
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Granted: 1963-04-30
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Expires: 1980-04-01
Abstract
No abstract record available.
Inventors
- 👤 King Ellis Gray
- 👤 Adolphson Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:07
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/203; C09K8/03; C09K8/035
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
78 words
A PROCESS FOR PRODUCING USEFUL PRODUCTS FROM SULFONATED LIGNIN-CONTAINING MATERIAL COMPRISING THE STEP OF FORMING A SOLUBLE SALT OF A SULFONATED LIGNIN-CONTAINING MATERIAL WHICH HAS BEEN HEAT TREATED AT A TEMPERATURE BETWEEN ABOUT 170*C. AND 210*C. AND HIGHER TEMPERATURES, SAID SOLUBE SALT HAVING A CATION SELECTED FROM THE GROUP CONSISTING OF IRON, ALUMINUM, CHROMIUM, COPPER AND COMBINATIONS THEREOF, AND OXIDIZING SAID SALT WITH AN AXIDIZING AGENT HAVING AN OXIDIZING POWER STRONGER THAN AN OXIDATION POTENTIAL OF ABOUT -1.3.
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) | 1966-04-29 | 1966-10-29 | 1967-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-29 | 1970-10-29 | 1971-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-29 | 1974-10-29 | 1975-04-30 | $7700.00 | Window Closed / Lapsed |