US4088142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cigarettes
Assignee: British American Tobacco Investments Ltd
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Filing: 1976-09-30
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Granted: 1978-05-09
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Expires: 1996-09-30
Abstract
Abstract The invention is concerned with a wrapped cigarette and a method of producing the wrapper. A very highly porous wrapping paper, with an air porosity within the range from 2,450 to 20,000cm 3 min -1 10cm -2 10cmWG -1 is produced by perforation from a base paper having a tensile breaking strength of not less than 85 g per mm width of paper. The means number of perforations is suitably within the range from 10 to 150 per cm 2 of the paper and the mean diameter within the range from 30 to 200 microns. A cigarette wrapped in the highly porous paper may advantageously be provided with a tobacco-smoke filter having a filtration efficiency for nicotine within the range of 15 to 30%.
Inventors
- 👤 Henry G. Horsewell
- 👤 Robin A. Crellin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:03
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/12; D21H5/14; D21H5/16; A; A24; A24D; A24D1/00; A24D1/02; A24D1/027; D21H5/02; D21H5/025; D21H27/00; D21H27/002; D21H27/004; D21H27/005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
86 words
A cigarette comprising; a rod of tobacco wrapped in a material consisting of a very highly porous paper, with an air porosity within the range from 2,450 to 20,000cm 3 min -1 10cm -2 10cmWG -1 produced from a base paper having a tensile breaking strength of not less than 85 g per mm width of paper by perforation of the paper wherein upon combustion the effect of said material is to produce a low ratio of carbon monoxide to nicotine content in the smoke stream.
Claim 2
Dependent Claim
86 words
A cigarette comprising; a rod of tobacco wrapped in a material consisting of a very highly porous paper, with an air porosity within the range from 2,450 to 20,000cm 3 min -1 10cm -2 10cmWG -1 produced from a base paper having a tensile breaking strength of not less than 85 g per mm width of paper by perforation of the paper wherein upon combustion the effect of said material is to produce a low ratio of carbon monoxide to nicotine content in the smoke stream.
Claim 3
Dependent Claim
40 words
A cigarette according to claim 1, wherein the mean number of perforations is within the range from 10 to 150 per cm 2 of the paper and the mean diameter thereof is within the range from 30 to 200 microns.
Claim 4
Dependent Claim
24 words
A cigarette according to claim 1, wherein the wrapping material, in the form of a strip, has a non-perforated margin at each longitudinal edge.
Claim 5
Dependent Claim
24 words
A cigarette according to claim 1, provided with a tobacco-smoke filter having a filtration efficiency for nicotine within the range of 15 to 30%.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |