US3635226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tobacco-smoke filters
Assignee: British American Tobacco Investments Ltd
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Filing: 1969-06-16
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Granted: 1972-01-18
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Expires: 1989-06-16
Abstract
Abstract The invention concerns a multicomponent filter for tobaccosmoking articles, such as cigarettes. A three-component filter has at least an absorbent filter section, an aqueous humidifying means and a poorly absorbent section. The humidifying means is to enhance the filtering action and/or serve as a flavorant or flavor-enhancing agent.
Inventors
- 👤 Henry George Horsewell
- 👤 Thomas William Charles Tolman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:37
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/16; A24D3/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
The invention in accordance with claim 1, wherein the water-absorbent filter material is paper.
Claim 2
Dependent Claim
71 words
A tobacco-smoke filter assembly comprising: a tubular wrapper within which is disposed in sequential axial alignment, a filter plug of cellulose acetate abutting the mouth end of said assembly and a filter plug comprising a water-absorbent filter material having deposited thereon from about 5 to 15 percent by weight based on the absorbent material of a polyalkyleneimine, said filter assembly having from about 50 to 150 milligrams of water associated therewith.
Claim 3
Dependent Claim
69 words
A tobacco smoke filter assembly comprising: a tubular wrapper within which is disposed in sequential axial alignment, a filter plug of cellulose acetate abutting the mouth end of said assembly, a frangible capsule containing from about 50 to 150 milligrams of water and a filter plug of water absorbent material having deposited thereon a polyalkyleneimine present in amounts from about 5 to 15 percent by weight of absorbent material.
Claim 4
Dependent Claim
14 words
The invention in accordance with claim 3 wherein the water-absorbent filter material is paper.
References Cited (Backward Citations)
US2808057A
Cited
US2863461A
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US3061479A
Cited
US3251365A
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US3250280A
Cited
US3366121A
Cited
US3390686A
Cited
US3340879A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |