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Patent US4246910A successfully refreshed from Google Patents.
US4246910A
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US
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Cigarette filter material comprising compounds of iron in high oxidation states
Assignee: Philip Morris USA Inc
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Filing: 1977-08-01
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Granted: 1981-01-27
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Expires: 1997-08-01
Abstract
Abstract Inert gas-permeable granular support materials impregnated with alkali ferrates wherein the ferrates are iron compounds having an oxidation state of +4, +5, or +6 are disclosed. When they are used as a granular filter material in combination with a tobacco product, hydrogen cyanide can be significantly reduced in the smoke obtained from the tobacco product. Activated carbon or alumina impregnated with sodium permanganate and a basic sodium compound may also be combined with the granular filter material.
Inventors
- 👤 Norman B. Rainer
- 👤 Cynthia V. Bailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:46
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/16; B; B01; B01J; B01J20/00; B01J20/02; B01J20/0203; B01J20/0222; B01J20/0225; B01J20/0229; B01J20/04; B01J20/041; B01J20/043; B01J20/06; B01J20/08; B01J20/10; B01J20/16; B01J20/18; B01J20/186; B01J20/20; B01J20/28; B01J20/28002; B01J20/28004; B01J20/28054; B01J20/28057; B01J20/28078; B01J20/2808; B01J20/30; B01J20/3085; B01J20/3092; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3206; B01J20/3208; B01J20/321; B01J20/3231; B01J20/3234; B01J20/3236; B01J2220/00; B01J2220/40; B01J2220/42; B01J2220/50; B01J2220/66
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
48 words
An article comprising a smoking material and in smoke filtering relationship therewith a filter element containing an inert gas-permeable granular support material impregnated with alkali or alkaline earth, ferrate, said ferrate being present in an amount from about 15 to about 50% by weight of said impregnated material.
Claim 2
Dependent Claim
48 words
An article comprising a smoking material and in smoke filtering relationship therewith a filter element containing an inert gas-permeable granular support material impregnated with alkali or alkaline earth, ferrate, said ferrate being present in an amount from about 15 to about 50% by weight of said impregnated material.
Claim 3
Dependent Claim
25 words
The article of claim 1 in which said granular support material has admixed therewith from about 30 to about 50% by weight of activated charcoal.
Claim 4
Dependent Claim
15 words
The article of claim 1 in which said granular support comprises a zeolite molecular sieve.
Claim 5
Dependent Claim
18 words
The article of claim 1 in which said ferrate is potassium ferrate VI in admixture with potassium hydroxide.
Claim 6
Dependent Claim
41 words
The article of claim 1 in which said granular support material has admixed therewith about 25 to about 50% by weight of granules of essentially silica-free alumina impregnated with a solution of sodium permanganate in combination with a basic sodium compound.
Claim 7
Dependent Claim
63 words
An inert gas-permeable granular support material impregnated with alkali or alkaline earth ferrate, said ferrate being present in an amount from about 15 to about 50% by weight of said impregnated material, in admixture with from about 30 to about 50% by weight of activated carbon having a surface area of from about 800 m 2 /gm to about 1600 m 2 /gm.
Claim 8
Dependent Claim
63 words
An inert gas-permeable granular support material impregnated with alkali or alkaline earth ferrate, said ferrate being present in an amount from about 15 to about 50% by weight of said impregnated material, in admixture with from about 30 to about 50% by weight of activated carbon having a surface area of from about 800 m 2 /gm to about 1600 m 2 /gm.
Claim 9
Dependent Claim
63 words
An inert gas-permeable granular support material impregnated with alkali or alkaline earth ferrate, said ferrate being present in an amount from about 15 to about 50% by weight of said impregnated material, in admixture with from about 25 to about 50% by weight of granules of essentially silica-free alumina impregnated with a solution of sodium permanganate in combination with a basic sodium compound.
Claim 10
Dependent Claim
63 words
An inert gas-permeable granular support material impregnated with alkali or alkaline earth ferrate, said ferrate being present in an amount from about 15 to about 50% by weight of said impregnated material, in admixture with from about 25 to about 50% by weight of granules of essentially silica-free alumina impregnated with a solution of sodium permanganate in combination with a basic sodium compound.
Claim 11
Dependent Claim
69 words
A filter element for tobacco smoke containing an inert gas-permeable granular support material impregnated with alkali or alkaline earth ferrate, said ferrate being present in an amount from about 15 to about 50% by weight of said impregnated material, in admixture with from about 30 to about 50% by weight of activated carbon having a surface area from about 800 m 2 /gm to about 1600 m 2 /gm.
Claim 12
Dependent Claim
69 words
A filter element for tobacco smoke containing an inert gas-permeable granular support material impregnated with alkali or alkaline earth ferrate, said ferrate being present in an amount from about 15 to about 50% by weight of said impregnated material, in admixture with from about 30 to about 50% by weight of activated carbon having a surface area from about 800 m 2 /gm to about 1600 m 2 /gm.
Claim 13
Dependent Claim
71 words
A filter element for tobacco smoke containing an inert gas-permeable granular support material impregnated with an alkali or alkaline earth ferrate, said ferrate being present in an amount from about 15 to about 50% by weight of said impregnated material, in admixture with from about 25 to about 50% by weight of granules of essentially silica-free alumina impregnated with a solution of sodium permanganate in combination with a basic sodium compound.
Claim 14
Dependent Claim
71 words
A filter element for tobacco smoke containing an inert gas-permeable granular support material impregnated with an alkali or alkaline earth ferrate, said ferrate being present in an amount from about 15 to about 50% by weight of said impregnated material, in admixture with from about 25 to about 50% by weight of granules of essentially silica-free alumina impregnated with a solution of sodium permanganate in combination with a basic sodium compound.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |