US2783201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing a dry composition containing an alkali metal hydroxide and a tannin containing material
Assignee: Columbia Southern Chemical Corp
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Filing: 1953-07-27
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Granted: 1957-02-26
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Expires: 1973-07-27
Abstract
No abstract record available.
Inventors
- 👤 Henry W Rahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:36
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/03; C09K8/035; Y; Y10; Y10S; Y10S507/00; Y10S507/904
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A METHOD OF PREPARING A COMPOSITION WHICH COMPRISES HEATING A NATURALLY OCCURRING MATERIAL WHICH CONTAINS AT LEAST 10 PERCENT BY WEIGHT OF AN ACID OF THE GROUP CONSISTING OF TANNIC ACID AND HUMIC ACID UNTIL THE WATER CONTENT IS BELOW ABOUT 8 PERCENT BY WEIGHT AND MIXING THE DRIED PRODUCT WITH SODIUM HYDROXIDE WHICH CONTAINS LESS THAN 20 PERCENT BY WEIGHT OF WATER BEFORE THE HEATED TANNIN-CONTAINING MATERIAL CAN ABSORB SUBSTANTIAL MOISTURE, THE PROPORTION OF SODIUM HYDROXIDE TO SAID DRIED MATERIAL BEING SUBSTANTIALLY 0.1 TO 3 PARTS OF SODIUM HYDROXIDE PER PART OF SAID MATERIAL
Claim 2
Independent Claim
95 words
A METHOD OF PREPARING A COMPOSITION WHICH COMPRISES HEATING A NATURALLY OCCURRING MATERIAL WHICH CONTAINS AT LEAST 10 PERCENT BY WEIGHT OF AN ACID OF THE GROUP CONSISTING OF TANNIC ACID AND HUMIC ACID UNTIL THE WATER CONTENT IS BELOW ABOUT 8 PERCENT BY WEIGHT AND MIXING THE DRIED PRODUCT WITH SODIUM HYDROXIDE WHICH CONTAINS LESS THAN 20 PERCENT BY WEIGHT OF WATER BEFORE THE HEATED TANNIN-CONTAINING MATERIAL CAN ABSORB SUBSTANTIAL MOISTURE, THE PROPORTION OF SODIUM HYDROXIDE TO SAID DRIED MATERIAL BEING SUBSTANTIALLY 0.1 TO 3 PARTS OF SODIUM HYDROXIDE PER PART OF SAID MATERIAL
References Cited (Backward Citations)
US2560930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-26 | 1960-08-27 | 1961-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-26 | 1964-08-27 | 1965-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-26 | 1968-08-27 | 1969-02-26 | $7700.00 | Window Closed / Lapsed |