Patent US4266561A successfully refreshed from Google Patents.
US4266561A
Expired / Lapsed
US
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Tobacco smoke filtering compositions
Assignee: Brown and Williamson Holdings Inc
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Filing: 1978-04-10
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Granted: 1981-05-12
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Expires: 1998-04-10
Abstract
Abstract The disclosure is of compositions useful for chemisorption of undesirable chemical compounds found in tobacco smoke. The compositions comprise a base of alumina (aluminum oxide) impregnated with various proportions of zinc acetate, acetic acid and polyethyleneimine. The compositions are usefully employed as chemical filter components and are particularly advantageous in that they have a capacity to remove large quantities of hydrogen cyanide and hydrogen sulfide from tobacco smoke while simultaneously removing acetaldehyde. Unexpectedly the smoking quality of cigarettes, to which the compositions may be associated, is not adversely affected. To the contrary, smoking quality of such cigarettes is improved.
Inventors
- 👤 Elmer F. Litzinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:22
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/16
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
67 words
In a filter structure, a composition, which comprises: alumina impregnated with polyethyleneimine, acetic acid and zinc acetate wherein the proportion of polyethyleneimine is from about 2 to 9 percent by weight of alumina, the proportion of zinc acetate is from about 0.5 to 5 percent by weight of alumina and the proportion of acetic acid being sufficient to give a final pH of from 6.0 to 7.6.
Claim 2
Dependent Claim
67 words
In a filter structure, a composition, which comprises: alumina impregnated with polyethyleneimine, acetic acid and zinc acetate wherein the proportion of polyethyleneimine is from about 2 to 9 percent by weight of alumina, the proportion of zinc acetate is from about 0.5 to 5 percent by weight of alumina and the proportion of acetic acid being sufficient to give a final pH of from 6.0 to 7.6.
Claim 3
Dependent Claim
32 words
The composition of claim 1 wherein the alumina has a pore size of from about 0.1 to 2.0 microns and a pore volume not less than about 0.3 cubic centimeters per gram.
Claim 4
Dependent Claim
27 words
The composition of claim 1 wherein the proportion of polyethyleneimine is about 5 percent and the proportion of zinc acetate is from about 1 to 2 percent.
Claim 5
Dependent Claim
15 words
The composition of claim 3 wherein the proportion of zinc acetate is about 1 percent.
Claim 6
Dependent Claim
14 words
The composition of claim 4 wherein the proportion of polyethyleneimine is about 5 percent.
Claim 7
Dependent Claim
24 words
The composition of claim 1 wherein the mole ratio of zinc acetate to polyethyleneimine is within the range of from about 1:10 to 1:20.
Claim 8
Dependent Claim
71 words
A chemisorptive composition for removal of tobacco smoke which comprises: alumina impregnated with from about 2 to 9 percent by weight of polyethyleneimine, from about 0.5 to 5 percent by weight zinc acetate and sufficient acetic acid to give a final pH of about 6.0 to 7.6, said alumina having a pore size of from about 0.1 to 2.0 microns and a pore volume of not less than about 0.3 cc/gm.
Claim 9
Dependent Claim
71 words
A chemisorptive composition for removal of tobacco smoke which comprises: alumina impregnated with from about 2 to 9 percent by weight of polyethyleneimine, from about 0.5 to 5 percent by weight zinc acetate and sufficient acetic acid to give a final pH of about 6.0 to 7.6, said alumina having a pore size of from about 0.1 to 2.0 microns and a pore volume of not less than about 0.3 cc/gm.
Claim 10
Dependent Claim
25 words
The composition of claim 7 wherein the proportion of polyethyleneimine is about 5 percent and the proportion of zinc acetate is 1 to 2 percent.
Claim 11
Dependent Claim
14 words
The composition of claim 8 wherein the proportion of zinc acetate is 1 percent.
Claim 12
Dependent Claim
14 words
The composition of claim 9 wherein the proportion of polyethyleneimine is about 5 percent.
Claim 13
Dependent Claim
23 words
The composition of claim 7 wherein the mole ratio of zinc acetate to polyethyleneimine is within the range of from 1:10 to 1:20.
Claim 14
Dependent Claim
99 words
A cigarette, which comprises: a tobacco rod enclosed by a cigarette wrapper; and a tobacco smoke filter attached to one end of said rod, said filter comprising a filter enclosure and enclosed within the enclosure a chemisorptive composition which comprises alumina impregnated with polyethyleneimine, zinc acetate and acetic acid wherein the proportion of polyethyleneimine is from about 2 to 9 percent by weight of alumina, the proportion of zinc acetate is from about 0.5 to 5 percent by weight of alumina and the proportion of acetic acid being sufficient to give a final pH of from 6.0 to 7.6.
Claim 15
Dependent Claim
99 words
A cigarette, which comprises: a tobacco rod enclosed by a cigarette wrapper; and a tobacco smoke filter attached to one end of said rod, said filter comprising a filter enclosure and enclosed within the enclosure a chemisorptive composition which comprises alumina impregnated with polyethyleneimine, zinc acetate and acetic acid wherein the proportion of polyethyleneimine is from about 2 to 9 percent by weight of alumina, the proportion of zinc acetate is from about 0.5 to 5 percent by weight of alumina and the proportion of acetic acid being sufficient to give a final pH of from 6.0 to 7.6.
Claim 16
Dependent Claim
15 words
The cigarette of claim 12 wherein said composition is dispersed onto a fibrous support material.
Claim 17
Dependent Claim
23 words
The cigarette of claim 12 wherein said enclosure comprises a filter wrapper, the ends of which are closed with cellulose acetate filter plugs.
Claim 18
Dependent Claim
14 words
The cigarette of claim 12 wherein said composition is in the form of granules.
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) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |