Patent US4062657A successfully refreshed from Google Patents.
Patent US3398186A successfully refreshed from Google Patents.
US3398186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of humic acid
Assignee: FMC Corp
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Filing: 1963-12-23
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Granted: 1968-08-20
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Expires: 1983-12-23
Abstract
No abstract record available.
Inventors
- 👤 Nelson N Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:32
CPC Classifications
C; C08; C08H; C08H99/00; C05; C05F; C05F11/00; C05F11/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
PROCESS OF EXTRACTING HUMIC ACID VALUES FROM A SOURCE THEREOF WITH COMPRISES, USING AS THE EXTRACTING SOLUTION AN AQUEOUS SOLUTION OF A SULFIET SALT SELECTED FROM THE GROUP CONSISTING OF SODIUM SULFITE, POTASSIUM SULFITE AND AMMONIUM SULFITE, SAID SOLUTION HAVING A PH OF AT LEAST ABOUT 6, AND SEPARATING THE EXTRACTING SOLUTION CONTAINING HUMIC ACID VALUES FROM THE INSOLUABLE RESIDUES.
Claim 2
Dependent Claim
60 words
PROCESS OF EXTRACTING HUMIC ACID VALUES FROM A SOURCE THEREOF WITH COMPRISES, USING AS THE EXTRACTING SOLUTION AN AQUEOUS SOLUTION OF A SULFIET SALT SELECTED FROM THE GROUP CONSISTING OF SODIUM SULFITE, POTASSIUM SULFITE AND AMMONIUM SULFITE, SAID SOLUTION HAVING A PH OF AT LEAST ABOUT 6, AND SEPARATING THE EXTRACTING SOLUTION CONTAINING HUMIC ACID VALUES FROM THE INSOLUABLE RESIDUES.
References Cited (Backward Citations)
US2815329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |