US3774623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for removing polynuclear aromatic hydrocarbons from burning tobacco gas-smoke
Assignee: Boston Children's Hospital
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Filing: 1972-03-13
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Granted: 1973-11-27
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Expires: 1992-03-13
Abstract
Abstract Polynuclear Aromatic Hydrocarbons (PAH) can be absorbed and thereby removed from tobacco gas-smoke by polysiloxane compositions. The polysiloxane may be present in the tobacco to absorb the PAH at or near the combustion zone. Endothermic fillers in the polysiloxane and high polysiloxane to tobacco ratios are effective to reduce the combustion temperature and minimize desorption of previously absorbed PAH.
Inventors
- 👤 E Merrill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:19
CPC Classifications
A; A24; A24B; A24B15/00; A24B15/18; A24B15/24; A24B15/241; A24B15/246; A24B15/28; A24B15/30; A24D; A24D3/00; A24D3/06; A24D3/08; C; C08; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/14; C08G77/20; C08G77/70
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
26 words
The composition of claim 1 wherein the lipophilic absorbent is mixed with the tobacco in an amount between 0.5 and 3.0 times the weight of tobacco.
Claim 2
Dependent Claim
17 words
The composition of claim 1 wherein the filler endothermically liberates water vapor when the tobacco is burned.
Claim 3
Dependent Claim
17 words
The composition of claim 2 wherein the filler endothermically liberates water vapor when the tobacco is burned.
Claim 4
Dependent Claim
17 words
The composition of claim 1 wherein the filler endothermically liberates carbon dioxide when the tobacco is burned.
Claim 5
Dependent Claim
17 words
The composition of claim 2 wherein the filler endothermically liberates carbon dioxide when the tobacco is burned.
Claim 6
Dependent Claim
122 words
In a smoking device wherein tobacco is arranged to be smoked with a passage of tobacco gas-smoke therethrough, tobacco, a lipophilic absorbent mixed with said tobacco comprising an organic polysiloxane in the stream of said gas-smoke, said polysiloxane having a molecular weight greater than 100,000 and being capable of absorbing hydrocarbon constituents without evolving toxic materials when heated and containing admixed therewith from about 50 to about 300 parts of filler per 100 parts polysiloxane, said filler being selected from the group consisting of hydrates and carbonates endothermically dissociable to release water or carbon dioxide at a temperature less than about 350*C to limit the temperature rise of the absorbent during smoking to prevent substanial desorption of hydrocarbons absorbed by said polysiloxane.
Claim 7
Dependent Claim
20 words
The device of claim 7 wherein the absorbent comprises particles having a major dimension less than about one quarter inch.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |