US3805801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tobacco smoke filter
Assignee: Filtrona Richmond Inc
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Filing: 1972-06-12
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Granted: 1974-04-23
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Expires: 1992-06-12
Abstract
Abstract Tobacco smoke filter means, particularly for use with cigarettes and the like, having improved filtration efficiencies and/or reduced costs. One embodiment increases filtration efficiency by minimizing the crimped portion of the filtering material thereby maximizing the effective filtering area. Another embodiment reduces total weight of filtering material, and thereby costs of manufacture, while still producing high level filtration efficiency by utilizing a ''''double crimp'''' thereby forming an enclosed intermediate cavity means so that the smoke must pass through the filtering material twice.
Inventors
- 👤 R Berger
- 👤 E Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:13
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/02; A24D3/0275; A24D3/0283
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
280 words
A tobacco smoke filter means including a filter element comprising: a. an axially elongated, hollow, outer member; b. an axially elongated, hollow, inner member disposed within said outer member; c. said outer member including an inner surface and an outer surface and having spaced end portions; d. said inner member comprising a filtering material and including an inner surface and an outer surface and having spaced end portions; e. integral peripheral portions of said outer surface of said inner member intermediate said end portions of said inner member being juxtaposed to portions of said inner surface of said outer member to at least substantially preclude axial passage of smoke across the area therebetween; f. portions of said outer surface of said inner-member adjacent each of said end portions of said inner-member being spaced from said inner surface of said outer-member to define elongated end cavity means between said outer surface of said inner-member and said inner surface of said outer member adjacent each of said end portions of said inner member; g. integral portions of said inner member defining an area extending across the interior of said inner member adjacent each of said end portions of said inner member which offers at least as much resistance to passage of smoke as said filtering material; and, h. the interior of said inner member between said end portions of said inner member defining an enclosed intermediate cavity means, whereby smoke passing through said filter element between opposite ends thereof must travel through one said end cavity means, then through said filtering material, then through said intermediate cavity means, then through said filtering material again, and finally through the other end cavity means.
Claim 2
Dependent Claim
280 words
A tobacco smoke filter means including a filter element comprising: a. an axially elongated, hollow, outer member; b. an axially elongated, hollow, inner member disposed within said outer member; c. said outer member including an inner surface and an outer surface and having spaced end portions; d. said inner member comprising a filtering material and including an inner surface and an outer surface and having spaced end portions; e. integral peripheral portions of said outer surface of said inner member intermediate said end portions of said inner member being juxtaposed to portions of said inner surface of said outer member to at least substantially preclude axial passage of smoke across the area therebetween; f. portions of said outer surface of said inner-member adjacent each of said end portions of said inner-member being spaced from said inner surface of said outer-member to define elongated end cavity means between said outer surface of said inner-member and said inner surface of said outer member adjacent each of said end portions of said inner member; g. integral portions of said inner member defining an area extending across the interior of said inner member adjacent each of said end portions of said inner member which offers at least as much resistance to passage of smoke as said filtering material; and, h. the interior of said inner member between said end portions of said inner member defining an enclosed intermediate cavity means, whereby smoke passing through said filter element between opposite ends thereof must travel through one said end cavity means, then through said filtering material, then through said intermediate cavity means, then through said filtering material again, and finally through the other end cavity means.
Claim 3
Dependent Claim
35 words
A cigarette comprising, in combination, a tobacco rod and a filter means secured in end-to-end relationship to one end of said tobacco rod, said filter means including a filter element as defined in claim 5.
Claim 4
Dependent Claim
14 words
A filter means according to claim 1 wherein said filtering material comprises cellulose acetate.
Claim 5
Dependent Claim
61 words
A filter means according to claim 1 further including axially extending, circumferentially spaced, integral fin means surrounding said inner member in juxtaposition to each of said end portions thereof and extending from said end portions toward said integral peripheral portions of said inner member, said fin means including axially extending edge portions juxtaposed to said inner surface of said outer member.
Claim 6
Dependent Claim
22 words
A filter means according to claim 1 further including a quantity of a sorbent smoke-modifying material carried in said intermediate cavity means.
Claim 7
Dependent Claim
14 words
A filter means according to claim 5 wherein said smoke-modifying material comprises activated carbon.
References Cited (Backward Citations)
US3690326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-22 | 1977-10-22 | 1978-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-22 | 1981-10-22 | 1982-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-22 | 1985-10-22 | 1986-04-23 | $7700.00 | Window Closed / Lapsed |