Patent US3396735A successfully refreshed from Google Patents.
US3396735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous process of removing nicotine from tobacco
Assignee: Eresta Warenhandels GmbH
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Filing: 1966-04-13
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Granted: 1968-08-13
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Expires: 1986-04-13
Abstract
No abstract record available.
Inventors
- 👤 Bethmann Max Freiherr Von
- 👤 Lipp Gerhard
- 👤 Bayer Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:25
CPC Classifications
A; A24; A24B; A24B15/00; A24B15/18; A24B15/24; A24B15/241; A24B15/243; A24B15/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A CONTINUOUS PROCESS OF REMOVING NICOTINE FROM TOBACCO WHICH COMPRISES: (A) MOVING TOBACCO AND AN ORGANIC SOLVENT IN COUNTER FLOW RELATION ALONG THE SAME FLOW PATH, SAID ORGANIC SOLVENT BEING CAPABLE OF DISSOLVING NICOTINE AND EXHIBITING POOR MISCIBILITY WITH WATER, WHEREBY A NICOTINE-CONTAINING SOLUTION IS OBTAINED; (B) EXTRACTING THE NICOTINE-CONTAINING SOLUTION IN COUNTER FLOW RELATION WITH AN ACIDIC AQUEOUS SOLUTION HAVING A PH VALUE OF BELOW 2.5, WHEREBY NICOTINE PASSES FROM THE ORGANIC SOLVENT PHASE TO THE AQUEOUS SOLUTION; (C) RECYCLING THEREAFTER THE ORGANIC SOLVENT FOR EXTRACTION OF A FRESH AMOUNT OF NICOTINE FROM TOBACCO; (D) WITHDRAWING A PORTION OF THE AQUEOUS SOLUTION WHEN THE NICOTINE CONTENT THEREIN HAS REACHED A VALUE OF AT LEAST 5.0% BY WEIGHT; AND (E) REPLACING THE WITHDRAWN PORTION OF AQUEOUS SOLUTION WITH A FRESH AMOUNT OF ACIDIC AQUEOUS SOLUTION HAVING AN ACIDITY SUFFICIENT TO MAINTAIN THE PH IN THE AQUEOUS SOLUTION AT A VALUE BELOW 2.5.
Claim 2
Dependent Claim
152 words
A CONTINUOUS PROCESS OF REMOVING NICOTINE FROM TOBACCO WHICH COMPRISES: (A) MOVING TOBACCO AND AN ORGANIC SOLVENT IN COUNTER FLOW RELATION ALONG THE SAME FLOW PATH, SAID ORGANIC SOLVENT BEING CAPABLE OF DISSOLVING NICOTINE AND EXHIBITING POOR MISCIBILITY WITH WATER, WHEREBY A NICOTINE-CONTAINING SOLUTION IS OBTAINED; (B) EXTRACTING THE NICOTINE-CONTAINING SOLUTION IN COUNTER FLOW RELATION WITH AN ACIDIC AQUEOUS SOLUTION HAVING A PH VALUE OF BELOW 2.5, WHEREBY NICOTINE PASSES FROM THE ORGANIC SOLVENT PHASE TO THE AQUEOUS SOLUTION; (C) RECYCLING THEREAFTER THE ORGANIC SOLVENT FOR EXTRACTION OF A FRESH AMOUNT OF NICOTINE FROM TOBACCO; (D) WITHDRAWING A PORTION OF THE AQUEOUS SOLUTION WHEN THE NICOTINE CONTENT THEREIN HAS REACHED A VALUE OF AT LEAST 5.0% BY WEIGHT; AND (E) REPLACING THE WITHDRAWN PORTION OF AQUEOUS SOLUTION WITH A FRESH AMOUNT OF ACIDIC AQUEOUS SOLUTION HAVING AN ACIDITY SUFFICIENT TO MAINTAIN THE PH IN THE AQUEOUS SOLUTION AT A VALUE BELOW 2.5.
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) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |