US3897791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substitute smoking material employing degraded cellulose
Assignee: Asahi Kasei Corp
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Filing: 1972-08-08
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Granted: 1975-08-05
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Expires: 1992-08-08
Abstract
Abstract A substitute tobacco material obtained from degraded cellulose having a D.P. (degree of polymerization) distribution such that the average D.P. does not exceed 95 and the portion with D.P. in excess of 110 desirably accounts for not more than 10 percent of the whole composition. The said degraded cellulose can be obtained by converting cellulose into alkali cellulose through alkali treatment, adjusting the alkali cellulose to an average D.P. below 95, neutralizing the alkali cellulose, washing with water and drying. This degraded cellulose may be utilized in its unmodified state as a substitute tobacco material or as extender or carrier for tobacco products. A mixture of this degraded cellulose and at least one member selected from the group consisting of sodium cellulose glycolate, hydroxyethyl cellulose, methyl cellulose and ethyl cellulose provides a substitute tobacco material possessed of excellent film-forming property and proves useful for the manufacture of various tobacco products when the mixture contains the degraded cellulose by 75 percent or over. Tobacco products using such a substitute tobacco material enjoy an advantage that the contents of tars and nicotine liable to do harm to the human system at the time of smoking are lowered.
Inventors
- 👤 Koichi Yasui
- 👤 Shigeo Katsuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:08
CPC Classifications
C; C08; C08B; C08B1/00; C08B1/08; A; A24; A24B; A24B15/00; A24B15/10; A24B15/16; A24B15/165; C08B15/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
89 words
A SUBSTITUTE TABACCO MATERIAL COMPRISING A DEGRADED CELLULOSE HAVING AN AVERAGE D.P. OF UP TO 95 AND PREPARED BY TREATING A CELLULOSE WITH AM ALKALI FOLLOWED BY AGING OF THE RESULTING ALKALI CELLULOSE WITH AN OXYGEN-CONTAINING GAS, AND SODIUM CELLULOSE GLYCOLATE IN WHICH THE DEGREE OF SUBSTITUTION OF CARBOXYMETHOXY GROUP IS BETWEEN 0.6 AND 1.0 PERCENT AQUEOUS SOLUTION THEREOF HAS A VISCOSITY OF BETWEEN 80 AND 1,800 CENTIPOISES AT 20*C, THE SAID DEGRADED CELLULOSE BEING CONTAINED THEREIN IN AN AMOUNT AT LEAST 75 PERCENT BY WEIGHT OF SAID MATERIAL.
Claim 2
Dependent Claim
89 words
A SUBSTITUTE TABACCO MATERIAL COMPRISING A DEGRADED CELLULOSE HAVING AN AVERAGE D.P. OF UP TO 95 AND PREPARED BY TREATING A CELLULOSE WITH AM ALKALI FOLLOWED BY AGING OF THE RESULTING ALKALI CELLULOSE WITH AN OXYGEN-CONTAINING GAS, AND SODIUM CELLULOSE GLYCOLATE IN WHICH THE DEGREE OF SUBSTITUTION OF CARBOXYMETHOXY GROUP IS BETWEEN 0.6 AND 1.0 PERCENT AQUEOUS SOLUTION THEREOF HAS A VISCOSITY OF BETWEEN 80 AND 1,800 CENTIPOISES AT 20*C, THE SAID DEGRADED CELLULOSE BEING CONTAINED THEREIN IN AN AMOUNT AT LEAST 75 PERCENT BY WEIGHT OF SAID MATERIAL.
Claim 3
Dependent Claim
79 words
A substitute tobacco material comprising a degraded cellulose having an average D.P. of up to 95 and prepared by treating a cellulose with an alkali followed by aging of the resulting alkali cellulose with an oxygen-containing gas, and hydroxyethyl cellulose, a 2 percent agueous solution of which hydroxyethyl cellulose has a viscosity of between 70 and 4,000 centipoises at 20*C., the said degraded cellulose being contained therein in an amount at least 75 percent by weight of said material.
Claim 4
Dependent Claim
79 words
A substitute tobacco material comprising a degraded cellulose having an average D.P. of up to 95 and prepared by treating a cellulose with an alkali followed by aging of the resulting alkali cellulose with an oxygen-containing gas, and hydroxyethyl cellulose, a 2 percent agueous solution of which hydroxyethyl cellulose has a viscosity of between 70 and 4,000 centipoises at 20*C., the said degraded cellulose being contained therein in an amount at least 75 percent by weight of said material.
Claim 5
Dependent Claim
90 words
A substitute tobacco material comprising a degraded cellulose having an average D.P. of up to 95 and prepared by treating a cellulose with an alkali followed by aging of the resulting alkali cellulose with an oxygen-containing gas, and methylcellulose in which the degree of substitution of methoxyl group is between 1.6 and 2.0 and a 2 percent aqueous solution thereof has a viscosity of between 500 and 6,000 centipoises at 20*C., the said degraded cellulose being contained therein in an amount at least 75 percent by weight of said material.
Claim 6
Dependent Claim
90 words
A substitute tobacco material comprising a degraded cellulose having an average D.P. of up to 95 and prepared by treating a cellulose with an alkali followed by aging of the resulting alkali cellulose with an oxygen-containing gas, and methylcellulose in which the degree of substitution of methoxyl group is between 1.6 and 2.0 and a 2 percent aqueous solution thereof has a viscosity of between 500 and 6,000 centipoises at 20*C., the said degraded cellulose being contained therein in an amount at least 75 percent by weight of said material.
Claim 7
Dependent Claim
73 words
A substitute tobacco material comprising a degraded cellulose having an average D.P. of up to 95 and prepared by treating a cellulose with an alkali followed by aging of the resulting alkali cellulose with an oxygen-containing gas, and ethyl cellulose in which the degree of substitution of ethoxyl group is between 0.6 and 1.5, the said degraded cellulose being contained therein in an amount at least 75 percent by weight of said material.
Claim 8
Dependent Claim
73 words
A substitute tobacco material comprising a degraded cellulose having an average D.P. of up to 95 and prepared by treating a cellulose with an alkali followed by aging of the resulting alkali cellulose with an oxygen-containing gas, and ethyl cellulose in which the degree of substitution of ethoxyl group is between 0.6 and 1.5, the said degraded cellulose being contained therein in an amount at least 75 percent by weight of said material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |