US4022223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smoking article
Assignee: Philip Morris USA Inc
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Filing: 1973-07-26
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Granted: 1977-05-10
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Expires: 1993-07-26
Abstract
Abstract Selected heavy metal compounds, particularly copper or nickel in the form of their salts, may be complexed with selected aliphatic or aromatic amines and deposited on a solid support or substrate to provide a material for the detection and/or removal of HCN from a mixture of gases; removal from tobacco smoke being particularly desirable. Certain novel compositions are also provided.
Inventors
- 👤 Norman B. Rainer
- 👤 Charles B. Hoelzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:41
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
134 words
A smoking article comprising a tobacco or tobacco-substitute portion and a smoke filtering portion therefor, said smoke filtering portion containing a filtering element and a metal salt-amine complex wherein the amine of the complex is a non-volatile amine having a molecular weight of from about 450 to about 60,000 and having a vapor pressure below about 0.01 mm. Hg. at 20° C., said metal salt being soluble in water or aqueous ammonia and said metal salt-amine complex exhibiting a mole ratio of metal cation to co-ordinated amine radical of about 1:1 to about 1:4, said complex being incorporated in said smoke filtering portion in an amount from about 0.1% to 40% by weight thereof, the cation of said metal being selected from the group consisting of copper, nickel, iron, cobalt, manganese and mixtures thereof.
Claim 2
Dependent Claim
134 words
A smoking article comprising a tobacco or tobacco-substitute portion and a smoke filtering portion therefor, said smoke filtering portion containing a filtering element and a metal salt-amine complex wherein the amine of the complex is a non-volatile amine having a molecular weight of from about 450 to about 60,000 and having a vapor pressure below about 0.01 mm. Hg. at 20° C., said metal salt being soluble in water or aqueous ammonia and said metal salt-amine complex exhibiting a mole ratio of metal cation to co-ordinated amine radical of about 1:1 to about 1:4, said complex being incorporated in said smoke filtering portion in an amount from about 0.1% to 40% by weight thereof, the cation of said metal being selected from the group consisting of copper, nickel, iron, cobalt, manganese and mixtures thereof.
Claim 3
Dependent Claim
25 words
The article of claim 1, wherein the filtering portion comprises a filter base carrier having a surface area greater than 0.4 square meter per gram.
Claim 4
Dependent Claim
41 words
The article of claim 1, wherein the anionic portion of the metal salt is selected from the group consisting of chloride, sulfate, nitrate, phosphate, and hydroxl ions, organic acid ions having from 1 to about 12 carbon atoms, and mixtures thereof.
Claim 5
Dependent Claim
43 words
The article of claim 3, wherein the metal salt of the complex is selected from the group consisting of cuprous chloride, cupric chloride and nickelous chloride and the amine is a polyalkylenimine having a molecular weight of from about 450 to about 60,000.
Claim 6
Dependent Claim
14 words
The article of claim 1, wherein the cation of said metal salt is copper.
Claim 7
Dependent Claim
14 words
The article of claim 1, wherein the cation of said metal salt is nickel.
Claim 8
Dependent Claim
24 words
The article of claim 1, wherein the cation of said metal salt is selected from the group consisting of copper, nickel and mixtures thereof.
Claim 9
Dependent Claim
34 words
The article of claim 2, wherein the metal salt of the complex has a cation selected from the group consisting of divalent ion of copper, of nickel, monovalent ion of copper, and mixtures thereof.
References Cited (Backward Citations)
US2815760A
Cited
US3046994A
Cited
NL6503794A
Cited
US3340879A
Cited
US3410282A
Cited
US3724469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |