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US4561452A
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US
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Procedure for producing low nicotine tobacco by means of high pressure extraction
Assignee: Kohlensaure-Werke Rud Buse & Co GmbH
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Filing: 1984-08-27
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Granted: 1985-12-31
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Expires: 2004-08-27
Abstract
Abstract High pressure of nicotine with a compressed gaseous solvent is used for producing low nicotine tobacco. A mixture of nitrogen and carbon dioxide with the nitrogen being 50-80 percent of the mixture is used. The extraction is carried out at pressures between 250 and 600 bar at temperatures above 50 DEG C.
Inventors
- 👤 Hans J. Gahrs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:16
CPC Classifications
A; A24; A24B; A24B15/00; A24B15/18; A24B15/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
59 words
In a procedure for producing low nicotine tobacco by means of high pressure extraction of the nicotine by means of a compressed gaseous solvent, the improvement being in mixing nitrogen and carbon dioxide with a proportion of 50 to 80 percent nitrogen, and extracting the nicotine at pressures between 250 and 600 bar and at temperatures above 50° C.
Claim 2
Dependent Claim
59 words
In a procedure for producing low nicotine tobacco by means of high pressure extraction of the nicotine by means of a compressed gaseous solvent, the improvement being in mixing nitrogen and carbon dioxide with a proportion of 50 to 80 percent nitrogen, and extracting the nicotine at pressures between 250 and 600 bar and at temperatures above 50° C.
Claim 3
Dependent Claim
35 words
Procedure according to claim 1, characterized thereby that the content of nitrogen in the solvent amounts to 70 to 80 percent and that the extraction is carried out at pressures from 300 to 600 bar.
Claim 4
Dependent Claim
29 words
Procedure according to claim 2, characterized thereby that the nicotine is separated from the solvent by changing the composition of the solvent after it has left the extraction container.
Claim 5
Dependent Claim
42 words
Procedure according to claim 3, characterized thereby that in order to increase the fill volume of the tobacco, the tobacco is released after the extraction of the nicotine and is subjected to a thermal after-treatment at temperatures between 100° and 300° C.
Claim 6
Dependent Claim
21 words
Procedure according to claim 4, characterized thereby that the thermal after-treatment is carried out at temperatures between 150° and 300° C.
Claim 7
Dependent Claim
42 words
Procedure according to claim 2, characterized thereby that in order to increase the fill volume of the tobacco, the tobacco is released after the extraction of the nicotine and is subjected to a thermal after-treatment at temperatures between 100° and 300° C.
Claim 8
Dependent Claim
29 words
Procedure according to claim 1, characterized thereby that the nicotine is separated from the solvent by changing the composition of the solvent after it has left the extraction container.
Claim 9
Dependent Claim
42 words
Procedure according to claim 1, characterized thereby that in order to increase the fill volume of the tobacco, the tobacco is released after the extraction of the nicotine and is subjected to a thermal after-treatment at temperatures between 100° and 300° C.
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) | 1988-12-30 | 1989-07-01 | 1989-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-30 | 1993-07-01 | 1993-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-30 | 1997-07-01 | 1997-12-31 | $7700.00 | Window Closed / Lapsed |