US3577997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tobacco treatment with citric acid and deuterium oxide
Assignee: American Chemosol Corp
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Filing: 1969-03-20
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Granted: 1971-05-11
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Expires: 1989-03-20
Abstract
Abstract Treatment of tobacco to render smoking of the same safer. Reduction of the quantity of various undesirable constituents, particularly benzo(a)pyrene, in smoke resulting from the pyrolysis of such tobaccos in cigarettes and the like is shown as well as biological studies indicating such smoke condensates to be physiologically less dangerous. A mixture of citric acid and deuterium oxide is utilized to effect the foregoing modification of the combustion products of tobacco treated therewith.
Inventors
- 👤 Max August Helmut Bindig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:20
CPC Classifications
A; A24; A24B; A24B15/00; A24B15/18; A24B15/24; A24B15/241; A24B15/246; A24B15/28; A24B15/42
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
40 words
The method of claim 1 wherein said material is an aqueous solution having a pH of between about 4 and 6, said deuterium oxide being present in from about 10 to about 100 percent by weight of said citric acid.
Claim 2
Dependent Claim
11 words
The method of claim 2 wherein said pH is about 5.
Claim 3
Dependent Claim
26 words
The method of claim 2 wherein said material, in aqueous solution, is sprayed onto said tobacco in quantities sufficient to impregnate said tobacco with said mixture.
Claim 4
Dependent Claim
88 words
The method of claim 1 wherein said material comprises an aqueous solution of about 1 gram of citric acid and 1 milliliter of deuterium oxide in 10 milliliters of water diluted to provide said solution with a pH of between about 4.5 and 5.5, further comprising the steps of initially adjusting said tobacco to a humidity of from about 50 to about 60 percent, an spraying said aqueous solution onto said tobacco in sufficient quantities to raise the humidity of said tobacco by at least aBout 20 percent.
Claim 5
Dependent Claim
18 words
The method of claim 5 wherein said spraying is effected at a temperature of about 20*- 30* C.
Claim 6
Dependent Claim
46 words
A smoking article including a tobacco charge adapted to be ignited and smoked, the tobacco composition in said charge including a sufficient amount of a mixture of citric acid and deuterium oxide to reduce the benzo(a)pyrene content in smoke resulting from pyrolysis of the tobacco composition.
Claim 7
Dependent Claim
31 words
A tobacco composition comprising tobacco and a sufficient amount of a mixture of citric acid and deuterium oxide to reduce the benzo(a)pyrene content in smoke resulting from pyrolysis of the tobacco.
Claim 8
Dependent Claim
34 words
The method of claim 2 wherein said tobacco is treated with said material in amounts sufficient to provide from about 1 mg. to 100 mg. of citric acid to each 5 kg. of tobacco.
Claim 9
Dependent Claim
62 words
The smoking article of claim 7 wherein said mixture of citric acid and deuterium oxide is present in amounts sufficient to provide a ration of citric acid to tobacco of about 1 mg. to 100 mg. citric acid per 5 kg. of tobacco, and said deuterium oxide is present in from about 10 to 100 percent by weight of said citric acid.
Claim 10
Dependent Claim
10 words
A cigarette having a tobacco composition according to claim 8.
Claim 11
Dependent Claim
62 words
A tobacco composition according to claim 8 wherein said mixture of citric acid and deuterium oxide is present in amounts sufficient to provide a ratio of citric acid to tobacco of about 1 mg. to 100 mg. citric acid per 5 kg. tobacco, and said deuterium oxide is present in from about 10 to 100 percent by weight of said citric acid.
References Cited (Backward Citations)
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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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |