Patent US4207291A successfully refreshed from Google Patents.
US4207291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ozone removal filter having manganese dioxide coated thereon
Assignee: McDonnell Douglas Corp
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Filing: 1978-04-03
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Granted: 1980-06-10
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Expires: 1998-04-03
Abstract
Abstract Filter for removal of ozone from air, e.g. in aircraft cabins, comprising a porous and preferably light weight and thermally stable substrate, particularly an organic polymer such as polybenzimidazole, containing a film or coating of manganese dioxide. The article can be formed by treating the substrate with a permanganate solution under conditions to reduce the permanganate to MnO 2 .
Inventors
- 👤 Norman R. Byrd
- 👤 Reino E. Luoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:04
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8671; B01D53/8675; B01J; B01J31/00; B01J31/02; B01J31/06
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
58 words
A filter effective particularly for removing ozone from air, comprising a substrate formed of a porous light weight material containing a manganese dioxide coating deposited on said substrate from a permanganate solution, said substrate being a member selected from the group consisting of polybenzimidazole, a polyamide, a polyimide, a phenolic polymer, polyethylene, cellulose and derivatives and mixtures thereof.
Claim 2
Dependent Claim
58 words
A filter effective particularly for removing ozone from air, comprising a substrate formed of a porous light weight material containing a manganese dioxide coating deposited on said substrate from a permanganate solution, said substrate being a member selected from the group consisting of polybenzimidazole, a polyamide, a polyimide, a phenolic polymer, polyethylene, cellulose and derivatives and mixtures thereof.
Claim 3
Dependent Claim
18 words
A filter as defined in claim 1, wherein said substrate is in the form of batting or cloth.
Claim 4
Dependent Claim
46 words
A filter as defined in claim 1, said substrate being comprised of one or more layers of batting of said material positioned between outer layers of cloth of said material, said manganese dioxide being impregnated into and coated on said batting and said outer cloth layers.
Claim 5
Dependent Claim
15 words
A filter as defined in claim 1, wherein said substrate is a thermally stable material.
Claim 6
Dependent Claim
12 words
A filter as defined in claim 4, wherein said substrate is polybenzimidazole.
Claim 7
Dependent Claim
14 words
A filter as defined in claim 2, wherein said substrate is a chlorinated polyamide.
Claim 8
Dependent Claim
20 words
A filter as defined in claim 4, wherein said substrate is in the form of phenolic fibers punched on polyester.
Claim 9
Dependent Claim
51 words
A filter as defined in claim 1, said substrate being comprised of one or more layers of batting of said material stitched between outer layers of cloth of said material, and formed into a bag, said manganese dioxide being impregnated into and coated on said batting and said outer cloth layers.
Claim 10
Dependent Claim
13 words
A filter as defined in claim 8, wherein said bag is conically shaped.
Claim 11
Dependent Claim
12 words
A filter as defined in claim 8, wherein said substrate is polybenzimidazole.
Claim 12
Dependent Claim
14 words
A filter as defined in claim 8, wherein said substrate is a chlorinated polyamide.
Claim 13
Dependent Claim
20 words
A filter as defined in claim 8, wherein said substrate is in the form of phenolic fibers punched on polyester.
Claim 14
Dependent Claim
89 words
Apparatus for removing ozone from air which comprises in combination, an air duct, a filter positioned in said air duct, said filter comprising a substrate formed of a porous lightweight thermally stable material containing a manganese dioxide coating deposited on said substrate from a permanganate solution, said substrate being a member selected from the group consisting of polybenzimidazole, a polyamide, a polyimide, a phenolic polymer, and derivatives and mixtures thereof and means for mounting said filter in said air duct for passage of air containing ozone through said filter.
Claim 15
Dependent Claim
89 words
Apparatus for removing ozone from air which comprises in combination, an air duct, a filter positioned in said air duct, said filter comprising a substrate formed of a porous lightweight thermally stable material containing a manganese dioxide coating deposited on said substrate from a permanganate solution, said substrate being a member selected from the group consisting of polybenzimidazole, a polyamide, a polyimide, a phenolic polymer, and derivatives and mixtures thereof and means for mounting said filter in said air duct for passage of air containing ozone through said filter.
Claim 16
Dependent Claim
22 words
Apparatus as defined in claim 13, including a filter housing in said air duct, said mounting means being disposed in said housing.
Claim 17
Dependent Claim
15 words
Apparatus as defined in claim 13, wherein said substrate is in the form of batting.
Claim 18
Dependent Claim
50 words
Apparatus as defined in claim 13, said substrate being comprised of one or more layers of batting of said material stitched between outer layers of cloth of said material, and formed into a bag, said manganese dioxide being impregnated into and coated on said batting and said outer cloth layers.
Claim 19
Dependent Claim
18 words
Apparatus as defined in claim 16, said bag being conically shaped, and positioned axially in said air duct.
Claim 20
Dependent Claim
17 words
Apparatus as defined in claim 17, wherein said batting and said cloth of said bag are polybenzimidazole.
Claim 21
Dependent Claim
19 words
Apparatus as defined in claim 17, wherein said batting and said cloth of said bag are a chlorinated polyamide.
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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) | 1983-06-10 | 1983-12-10 | 1984-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-10 | 1987-12-10 | 1988-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-10 | 1991-12-10 | 1992-06-10 | $7700.00 | Window Closed / Lapsed |