US4073866A
Expired / Lapsed
US
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Process for converting nitrogen dioxide into nitrogen monoxide
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1976-10-18
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Granted: 1978-02-14
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Expires: 1996-10-18
Abstract
Abstract A process for converting nitrogen dioxide into nitrogen monoxide which comprises bringing a gas containing nitrogen dioxide into contact at a temperature ranging from 50 DEG C. to 400 DEG C. with a carbide of a metal selected from the group consisting of chromium, molybdenum, tungsten, vanadium, titanium, tantalum, silicon and boron or a composite carbide of such metals, thereby reducing nitrogen dioxide contained in the gas to nitrogen monoxide.
Inventors
- 👤 Naoomi Yamaki
- 👤 Natsuko Futsuhara
- 👤 Kazue Masuda
- 👤 Koji Tsuchimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:59
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/20; C01B21/24; C01B21/26; C01B21/262; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628; Y; Y10; Y10T; Y10T436/00; Y10T436/17; Y10T436/177692; Y10T436/178459
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
63 words
A process for selectively and quantitatively reducing nitrogen dioxide in a gas to nitrogen monoxide which comprises bringing a gas containing nitrogen dioxide into contact at a temperature within the range of 50° -400° C with a carbide of a metal selected from the group consisting of chromium, molybdenum, tungsten, vanadium, titanium, tantalum, silicon and boron or a composite carbide of said metals.
Claim 2
Dependent Claim
63 words
A process for selectively and quantitatively reducing nitrogen dioxide in a gas to nitrogen monoxide which comprises bringing a gas containing nitrogen dioxide into contact at a temperature within the range of 50° -400° C with a carbide of a metal selected from the group consisting of chromium, molybdenum, tungsten, vanadium, titanium, tantalum, silicon and boron or a composite carbide of said metals.
Claim 3
Dependent Claim
14 words
The process according to claim 1 wherein said gas is NO 2 -polluted atmosphere.
Claim 4
Dependent Claim
17 words
The process according to claim 1, wherein said gas is an NO 2 -containing exhaust gaseous effluent.
Claim 5
Dependent Claim
20 words
The process according to claim 1 wherein said gas contains nitrogen monoxide and organonitrogen compounds in addition to nitrogen dioxide.
Claim 6
Dependent Claim
13 words
The process according to claim 1, wherein said temperature range is 100°-350° C.
References Cited (Backward Citations)
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Cited
US3730686A
Cited
US3816595A
Cited
US3870468A
Cited
US3919397A
Cited
US3973914A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |