US4407308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smoking articles
Assignee: BRITISH-AMERICAN TOBACCO Co Ltd A CORP OF GREAT BRITAIN
•
Filing: 1982-03-01
•
Granted: 1983-10-04
•
Expires: 2002-03-01
Abstract
Abstract A smoking article such as a cigarette has a rod of smoking material wrapped in a wrapper of which the substantially uniform air permeability due to viscous flow is not more than 3 and preferably not more than 2 Coresta Units and of which the Do/t value is in the range of 0.08 to 0.65 cm sec-1, preferably 0.15 to 0.25 cm sec-1. The length of the rod of smoking material may suitably be within a range of 25 to 55 mm. A reduction in sidestream TPM delivery of 40% or more can be obtained. The invention is also concerned with a smoking-article wrapper material which satisfies the above permeability and Do/t value requirements.
Inventors
- 👤 Richard R. Baker
- 👤 Federick J. Dashley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:56
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/12; D21H5/14; D21H5/16; A; A24; A24D; A24D1/00; A24D1/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
53 words
A smoking article comprising a rod of smoking material wrapped in a wrapper of which the air permeability due to viscous flow is substantially uniform and is, substantially, not more that 3 Coresta Units and of which the Do/t value is, substantially, in the range of 0.08 to 0.65 cm sec -1 .
Claim 2
Dependent Claim
53 words
A smoking article comprising a rod of smoking material wrapped in a wrapper of which the air permeability due to viscous flow is substantially uniform and is, substantially, not more that 3 Coresta Units and of which the Do/t value is, substantially, in the range of 0.08 to 0.65 cm sec -1 .
Claim 3
Dependent Claim
24 words
A smoking article according to claim 1, wherein the Do/t value of the said wrapper is not lower than 0.15 cm sec -1 .
Claim 4
Dependent Claim
26 words
A smoking article according to claim 1 or 2, wherein the Do/t value of the said wrapper is not more than 0.25 cm sec -1 .
Claim 5
Dependent Claim
17 words
A smoking article according to claim 1 or 2, wherein the said wrapper is a paper wrapper.
Claim 6
Dependent Claim
21 words
A smoking article according to claim 1 or 2, wherein the said air permeability is not more than 2 Coresta Units.
Claim 7
Dependent Claim
28 words
A smoking article according to claim 1 or 2, wherein the length of the said rod of smoking material is within a range of 25 to 55 mm.
Claim 8
Dependent Claim
33 words
A smoking article according to claim 1 or 2, wherein, on smoking of the said article, the rate of production of sidestream TPM is not more than about 2 mg min -1 .
Claim 9
Dependent Claim
39 words
A smoking article according to claim 1, wherein, on smoking of the said article, a sidestream TPM delivery reduction of at least 40% is obtained compared, on an equal puff-number basis, with a cigarette having a conventional cigarette paper.
Claim 10
Dependent Claim
18 words
A smoking article according to claim 8, wherein the said sidestream TPM delivery reduction is 60% or more.
Claim 11
Dependent Claim
36 words
A smoking-article wrapper material of which the air permeability is, substantially, not more than 3 Coresta Units and the Do/t value of which is, substantially, in the range of 0.08 to 0.65 cm sec -1 .
Claim 12
Dependent Claim
36 words
A smoking-article wrapper material of which the air permeability is, substantially, not more than 3 Coresta Units and the Do/t value of which is, substantially, in the range of 0.08 to 0.65 cm sec -1 .
Claim 13
Dependent Claim
20 words
A wrapper material according to claim 10, wherein the Do/t value is not lower than 0.15 cm sec -1 .
References Cited (Backward Citations)
US3744496A
Cited
US3911932A
Cited
US4088142A
Cited
US4238283A
Cited
US4231377A
Cited
US4225636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |