US3685523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tobacco smoke filter
Assignee: Molins Machine Co Ltd
•
Filing: 1970-06-05
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Granted: 1972-08-22
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Expires: 1990-06-05
Abstract
Abstract A cigarette filter is provided with axially extending channels divided by axially extending walls of filtering material through which smoke is induced to pass from one channel to another, different channels being blocked at different ends so that smoke enters the filter by one channel and leaves by another. In the preferred embodiment, the filter comprises a core having a resistance to compression from which arms of filtering material extend to the covering wrapper. These arm define smoke passageways alternate ones of which are blocked at opposite ends so that the smoke is constrained to pass from one channel or passageway through a filtering arm to at least one of the adjacent channels.
Inventors
- 👤 Francis A M Labbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:58
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/04; A24D3/045
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
107 words
A cigarette filter comprising a tubular wrapper, a filter element disposed within said wrapper, said filter element being comprised of an axial core member from which a plurality of radially directed arms extend so as to contact the wrapper, and which define a plurality of smoke passage ways, alternate passageways being blocked by smoke impervious means at opposite ends, the arms being constituted of a filter material so that smoke entering one passageway is constrained to pass through an adjacent passageway before exiting after coursing through a filter arm, the said core element being ineffective as a filter and having resistance to compression higher than the filter.
Claim 2
Dependent Claim
107 words
A cigarette filter comprising a tubular wrapper, a filter element disposed within said wrapper, said filter element being comprised of an axial core member from which a plurality of radially directed arms extend so as to contact the wrapper, and which define a plurality of smoke passage ways, alternate passageways being blocked by smoke impervious means at opposite ends, the arms being constituted of a filter material so that smoke entering one passageway is constrained to pass through an adjacent passageway before exiting after coursing through a filter arm, the said core element being ineffective as a filter and having resistance to compression higher than the filter.
Claim 3
Dependent Claim
42 words
A filter element according to claim 1, in which the filter element is enclosed in a thermoplastic skin located within the wrapper, the thermoplastic skin being deformed at localized spots to form seals by which the ends of the passages are closed.
References Cited (Backward Citations)
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Cited
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Cited
US3081776A
Cited
US3370594A
Cited
US3366123A
Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |