Patent US3911932A successfully refreshed from Google Patents.
US3911932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of smoking delivery through cigarette paper porosity
Assignee: Philip Morris USA Inc
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Filing: 1974-07-31
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Granted: 1975-10-14
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Expires: 1994-07-31
Abstract
Abstract A cigarette wrapper is provided with different levels of porosity therein, the porosity of the wrapper at the smoking end being lower than that along the remaining length and in the direction of the mouth end so that alteration of burn is achieved thereby to effect a leveling of the smoke delivery profile as smoking progresses.
Inventors
- 👤 Jr Willie G Houck
- 👤 Warren E Claflin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:07
CPC Classifications
A; A24; A24D; A24D1/00; A24D1/02; A24D1/025
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
164 words
A smoking article comprising an elongated cylinder of tobacco, and a paper wrapper closely encircling said cylinder of tobacco, said wrapper having inner and outer surfaces and being sufficiently porous to admit air stream flow therethrough into said cylinder of tobacco when said smoking article is puffed during smoking, said article having a mouth end and a smoking end, said paper wrapper being characterized by having a porosity of about 20 to about 60 seconds Griener and further by a length thereof extending from the smoking end a predetermined distance to a location intermediate said smoking and mouth ends having a coating on one of said wrapper inner and outer surfaces of a material which is effective to reduce the wrapper porosity in said length to between about 120 to about 400 seconds Griener, whereby during smoking of said article air stream flow through said first-mentioned length of said wrapper is substantially inhibited relative to air flow through the remaining length of said wrapper.
Claim 2
Dependent Claim
164 words
A smoking article comprising an elongated cylinder of tobacco, and a paper wrapper closely encircling said cylinder of tobacco, said wrapper having inner and outer surfaces and being sufficiently porous to admit air stream flow therethrough into said cylinder of tobacco when said smoking article is puffed during smoking, said article having a mouth end and a smoking end, said paper wrapper being characterized by having a porosity of about 20 to about 60 seconds Griener and further by a length thereof extending from the smoking end a predetermined distance to a location intermediate said smoking and mouth ends having a coating on one of said wrapper inner and outer surfaces of a material which is effective to reduce the wrapper porosity in said length to between about 120 to about 400 seconds Griener, whereby during smoking of said article air stream flow through said first-mentioned length of said wrapper is substantially inhibited relative to air flow through the remaining length of said wrapper.
Claim 3
Dependent Claim
48 words
The smoking article of claim 1 in which a portion of the remaining length of said wrapper has a porosity of less than about 20 to about 60 seconds Griener but greater than that of the first-mentioned wrapper length, said portion being disposed adjacent said first-mentioned wrapper length.
Claim 4
Dependent Claim
35 words
The smoking article of claim 1 in which said coating is present on said first-mentioned length of wrapper surface in a continuous film thereof along the full longitudinal and encircling expanse of said first-mentioned length.
Claim 5
Dependent Claim
35 words
The smoking article of claim 1 in which said coating comprises a film-forming material selected from the group consisting of sodium carboxymethyl cellulose, methyl cellulose, enzyme coated starch, ethylated starch, ethyl cellulose and cellulose acetate.
Claim 6
Dependent Claim
15 words
The smoking article of claim 4 in which said coating contains additionally a burn-promoting additive.
Claim 7
Dependent Claim
15 words
The smoking article of claim 5 in which said burn-promoting additive is sodium potassium citrate.
Claim 8
Dependent Claim
50 words
The smoking article of claim 2 in which said portion of said remaining length has a coating on one of said wrapper inner and outer surfaces of a material which is effective to reduce the wrapper porosity in said portion to between about 60 seconds to about 120 seconds Griener.
Claim 9
Dependent Claim
63 words
The smoking article of claim 7 in which the coating on said first-mentioned length of wrapper is present thereon in a continuous film thereof along the full longitudinal and encircling expanse of said first-mentioned length, the coating on said portion of said remaining length wrapper surface being present thereon in a discontinuous film thereof along the longitudinal and encircling expanse of said portion.
Claim 10
Dependent Claim
26 words
The smoking article of claim 1 further comprising a tobacco filtering element connected in alignment with said wrapper cylinder of tobacco at the mouth end thereof.
References Cited (Backward Citations)
US3667479A
Cited
US3805799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |