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US4805644A Expired / Lapsed US ⏱️ 0.0 years remaining

Sidestream reducing cigarette paper

Assignee: Kimberly Clark Corp
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Filing: 1986-06-30
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Granted: 1989-02-21
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Expires: 2006-06-30
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Abstract

Abstract Sheet material especially useful in forming wrappers for smokeable articles such as cigarettes that results in reduced sidestream smoke. The sheet is formed by incorporating as a filler in a cellulosic web an amount of high (at least about 20 M 2 /g) superficial surface area filler in the range generally of about 5 to 50 percent by weight in the finished sheet resulting in a web superficial surface area of at least about 80 M 2 per square meter of web. The cellulosic material may be flax fiber or other natural cellulosic fibers conventionally used for such wrappers. Additional fillers may be used up to a total of about 50 percent, and burn modifier salts included. Examples of salts include the sodium or potassium salts of acids such as carbonic, formic, acetic, propionic, malic, lactic, glycolic, citric, tartaric, fumaric, oxalic, malonic, succinic, nitric, and phosphoric. The sheet can be formed by any conventional papermaking method. When such papers are used as cigarette wrappers, they effect a reduction of the total particulate matter in sidestream smoke of up to about 70 percent without serious deterioration of other desirable properties. In addition the sheet of the invention provides normal ash appearance in a smoking article.

Inventors

  • 👤 Vladimir Hampl, Jr.
  • 👤 Robert D. Fields
  • 👤 Edward P. Bullwinkel

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 19:18
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/12; D21H5/14; D21H5/16; A; A24; A24D; A24D1/00; A24D1/02

Claims Analysis

Total Claims: 21
Claim 1
Independent Claim 78 words
In a web material adapted for use as a wrapper for smoking articles, said material comprising a cellulosic base web having a substantially water insoluble and thermally stable filler having a superficial surface area in the range of at least about twenty M 2 /g providing a superficial surface area in the web of at least eighty square meters per square meter of web and containing up to about 15 percent by weight of an alkali metal salt.
Claim 2
Dependent Claim 78 words
In a web material adapted for use as a wrapper for smoking articles, said material comprising a cellulosic base web having a substantially water insoluble and thermally stable filler having a superficial surface area in the range of at least about twenty M 2 /g providing a superficial surface area in the web of at least eighty square meters per square meter of web and containing up to about 15 percent by weight of an alkali metal salt.
Claim 3
Dependent Claim 24 words
The material of claim 1 wherein the filler has a superficial surface area in the range of at least about 25 m 2 /g.
Claim 4
Dependent Claim 27 words
The material of claim 1 wherein the filler is selected from the group consisting of substantially water insoluble clays, oxides, peroxides, carbonates, phosphates, sulphates, aluminates and silicates.
Claim 5
Dependent Claim 11 words
The material of claim 1 wherein the filler is attapulgite clay.
Claim 6
Dependent Claim 11 words
The material of claim 1 wherein the filler is fumed alumina.
Claim 7
Dependent Claim 51 words
The material of claim 1 wherein the alkali metal salt is selected from the group consisting of sodium and potassium salts of carbonic acid, formic acid, acetic acid, propionic acid, malic acid, lactic acid, glycolic acid, citric acid, tartaric acid, fumaric acid, oxalic acid, malonic acid, nitric acid, and phosphoric acid.
Claim 8
Dependent Claim 20 words
The material of claim 6 wherein the salt is selected from the group consisting of sodium citrate and potassium citrate.
Claim 9
Dependent Claim 12 words
The material of claim 1 wherein the base web comprises flax fibers.
Claim 10
Dependent Claim 14 words
The material of claim 8 having a porosity of up to about 30 cm/min.
Claim 11
Dependent Claim 23 words
The material of claim 9 wherein the amount of filler is in the range of from about 5 to 50 percent by weight.
Claim 12
Dependent Claim 13 words
The material of claim 1 wherein the web also contains an inorganic filler.
Claim 13
Dependent Claim 13 words
The material of claim 11 wherein the additional inorganic filler is calcium carbonate.
Claim 14
Dependent Claim 18 words
The material of claim 1 wherein the base web has a permeability of up to about 30 cm/min.
Claim 15
Dependent Claim 63 words
The material of claim 1 wherein the filler is selected from the group consisting of attapulgite clay, fumed silica and alumina, peroxides of magnesium, calcium and strontium, carbonates of magnesium, calcium, strontium and barium, phosphates of magnesium, strontium and barium, sulphates of calcium, strontium and barium, aluminates of magnesium, calcium, strontium and barium, and silicates of magnesium, calcium, strontium, barium, sodium and potassium.
Claim 16
Dependent Claim 74 words
A smoking article comprising a tobacco rod surrounded by a wrapper wherein the wrapper comprises a cellulosic base web having a substantially water insoluble and thermally stable filler having a superficial surface area in the range of at least about twenty M 2 /g providing a superficial surface area of at least eighty square meters per square meter of paper and containing up to about 15 percent by weight of an alkali metal salt.
Claim 17
Dependent Claim 74 words
A smoking article comprising a tobacco rod surrounded by a wrapper wherein the wrapper comprises a cellulosic base web having a substantially water insoluble and thermally stable filler having a superficial surface area in the range of at least about twenty M 2 /g providing a superficial surface area of at least eighty square meters per square meter of paper and containing up to about 15 percent by weight of an alkali metal salt.
Claim 18
Dependent Claim 26 words
A smoking article as in claim 15 wherein the filler has a superficial surface area in the range of at least about 25 m 2 /g.
Claim 19
Dependent Claim 65 words
A smoking article as in claim 16 wherein the filler is selected from the group consisting of attapulgite clay, fumed silica and alumina, peroxides of magnesium calcium and strontium, carbonates of magnesium, calcium, strontium and barium, phosphates of magnesium, strontium and barium, sulphates of calcium, strontium and barium aluminates of magnesium, calcium, strontium and barium, and silicates of magnesium, calcium, strontium, barium, sodium and potassium.
Claim 20
Dependent Claim 13 words
A smoking article as in claim 17 wherein the filler is attapulgite clay.
Claim 21
Dependent Claim 13 words
A smoking article as in claim 19 wherein the filler is fumed alumina.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-02-21 1992-08-22 1993-02-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-02-21 1996-08-22 1997-02-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-02-21 2000-08-22 2001-02-21 $7700.00 Window Closed / Lapsed

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