Patent US4200609A successfully refreshed from Google Patents.
US4200609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ozone removal filter containing manganese dioxide and ceric oxide catalysts
Assignee: McDonnell Douglas Corp
•
Filing: 1978-04-03
•
Granted: 1980-04-29
•
Expires: 1998-04-03
Abstract
Abstract Production of a device or filter for removal of ozone from air, e.g. in aircraft cabins, by depositing an oxide film containing manganese dioxide on a substrate, particularly a light weight thermally stable substrate, e.g. polybenzimidazole, by treatment with a permanganate solution containing a soluble ceric salt such as ceric ammonium nitrate, and preferably also a dichromate such as sodium dichromate, to form a dense strongly adherent film or coating of MnO2, ceric oxide and preferably also chromic oxide, on the substrate. A solution containing an oxidizable organic component such as abietic acid can be first applied to the substrate, followed by treatment with the above permanganate solution.
Inventors
- 👤 Norman R. Byrd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:55
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8671; B01D53/8675; B01J; B01J23/00; B01J23/16; B01J23/32; B01J23/34
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
31 words
A device effective particularly for removing ozone from air, comprising a substrate containing a coating of manganese dioxide and ceric oxide, deposited from a permanganate solution containing a soluble ceric salt.
Claim 2
Independent Claim
31 words
A device effective particularly for removing ozone from air, comprising a substrate containing a coating of manganese dioxide and ceric oxide, deposited from a permanganate solution containing a soluble ceric salt.
Claim 3
Dependent Claim
21 words
The device as defined in claim 1, said substrate being selected from the group consisting of metals, glass, ceramics and plastics.
Claim 4
Dependent Claim
20 words
The device as defined in claim 1, said coating also containing chromic oxide, said permanganate solution also containing a dichromate.
Claim 5
Dependent Claim
21 words
The device as defined in claim 3, said substrate being selected from the group consisting of metals, glass, ceramics and plastics.
Claim 6
Dependent Claim
38 words
A filter effective particularly for removing ozone from air, comprising a substrate formed of a porous light weight material containing a coating of manganese dioxide and ceric oxide, deposited from a permanganate solution containing a soluble ceric salt.
Claim 7
Dependent Claim
38 words
A filter effective particularly for removing ozone from air, comprising a substrate formed of a porous light weight material containing a coating of manganese dioxide and ceric oxide, deposited from a permanganate solution containing a soluble ceric salt.
Claim 8
Dependent Claim
15 words
The filter as defined in claim 5, wherein said substrate is a thermally stable material.
Claim 9
Dependent Claim
28 words
The filter as defined in claim 5, said substrate being an organic substrate selected from the group consisting of glass, graphite and boron fibers, and woven metal fibers.
Claim 10
Dependent Claim
18 words
The filter as defined in claim 5, wherein said substrate is in the form of batting or cloth.
Claim 11
Dependent Claim
49 words
The filter as defined in claim 5, 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 and ceric oxide being impregnated into and coated on said batting and said outer cloth layers.
Claim 12
Dependent Claim
28 words
The filter as defined in claim 5, said substrate being a member selected from the group consisting of polybenzimidazole, a polyamide, a polyimide, a phenolic, polyethylene and cellulose.
Claim 13
Dependent Claim
12 words
The filter as defined in claim 10, wherein said substrate is polybenzimidazole.
Claim 14
Dependent Claim
14 words
The filter as defined in claim 10, wherein said substrate is a chlorinated polyamide.
Claim 15
Dependent Claim
20 words
The filter as defined in claim 10, wherein said substrate is in the form of phenolic fibers punched on polyester.
Claim 16
Dependent Claim
20 words
The filter as defined in claim 5, said coating also containing chromic oxide, said permanganate solution also containing a dichromate.
Claim 17
Dependent Claim
14 words
The filter as defined in claim 14, said substrate being an organic polymeric material.
Claim 18
Dependent Claim
28 words
The filter as defined in claim 14, said substrate being an inorganic substrate selected from the group consisting of glass, graphite and boron fibers, and woven metal fibers.
Claim 19
Dependent Claim
28 words
The filter as defined in claim 14, said substrate being a member selected from the group consisting of polybenzimidazole, a polyamide, a polyimide, a phenol, polyethylene and cellulose.
Claim 20
Dependent Claim
12 words
The filter as defined in claim 17, wherein said substrate is polybenzimidazole.
Claim 21
Dependent Claim
14 words
The filter as defined in claim 17, wherein said substrate is a chlorinated polyamide.
Claim 22
Dependent Claim
56 words
The filter as defined in claim 17, 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, ceric oxide and chromic oxide being impregnated into and coated on said batting and said outer cloth layers.
References Cited (Backward Citations)
US3019197A
Cited
US2739132A
Cited
US3269801A
Cited
US3295918A
Cited
US3407532A
Cited
JPS5036387A
Cited
US3993597A
Cited
US4003854A
Cited
JPS5154083A
Cited
US4111793A
Cited
US4007118A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |