US4076606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of decomposing nitrogen oxide (NOx)
Assignee: Pollution Preventing Res Labs KK
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Filing: 1976-08-02
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Granted: 1978-02-28
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Expires: 1996-08-02
Abstract
Abstract A method of decomposing NO x which includes exciting effluent gas containing nitrogen and NO x , or nitrogen, NO x and oxygen and/or carbon dioxide, and so on, with microwave irradiation.
Inventors
- 👤 Shin Suzuki
- 👤 Kazuo Matsumoto
- 👤 Ichiro Nakaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:54
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/54; B01D53/56; B01J; B01J19/00; B01J19/08; B01J19/12; B01J19/122; B01J19/126
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
51 words
A method for removing NO x from an effluent gaseous mixture comprising NO x and N 2 which comprises irradiating said gaseous mixture with microwave radiation at a gas pressure from about 1 to 14 mm Hg whereby the NO x in said gaseous mixture is decomposed to nitrogen and oxygen.
Claim 2
Independent Claim
51 words
A method for removing NO x from an effluent gaseous mixture comprising NO x and N 2 which comprises irradiating said gaseous mixture with microwave radiation at a gas pressure from about 1 to 14 mm Hg whereby the NO x in said gaseous mixture is decomposed to nitrogen and oxygen.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein said gaseous mixture is an effluent gas and the irradiation is carried out prior to discharging said effluent gas into the atmosphere.
Claim 4
Dependent Claim
16 words
The method of claim 2 wherein said effluent gas is the exhaust gas of a vehicle.
Claim 5
Dependent Claim
28 words
The method of claim 1, wherein said gaseous mixture is subjected to a desulfurization step prior to said microwave irradiation to remove SO 2 from said gaseous mixture.
Claim 6
Dependent Claim
23 words
The method of claim 1, wherein O 2 and H 2 O are removed from said gaseous mixture prior to said microwave irradiation.
Claim 7
Dependent Claim
17 words
The method of claim 1, wherein said gaseous mixture is irradiated while contained in a reaction tube.
Claim 8
Dependent Claim
19 words
The method of claim 1 wherein said irradiating is conducted at a temperature from about 20° to 45° C.
Claim 9
Dependent Claim
17 words
The method of claim 1 wherein said microwave radiation has input power from 100 to 140 W.
Claim 10
Dependent Claim
13 words
The method of claim 1 wherein said microwave radiation is at 2450 MHz.
Claim 11
Independent Claim
49 words
The method for removing NO x from a gas which comprises irradiating a stream of nitrogen gas with microwave radiation, thereby forming active nitrogen, and contacting said gas containing said NO 2 with said irradiated nitrogen containing active nitrogen whereby the NO x is decomposed to nitrogen and oxygen.
Claim 12
Independent Claim
49 words
The method for removing NO x from a gas which comprises irradiating a stream of nitrogen gas with microwave radiation, thereby forming active nitrogen, and contacting said gas containing said NO 2 with said irradiated nitrogen containing active nitrogen whereby the NO x is decomposed to nitrogen and oxygen.
Claim 13
Dependent Claim
26 words
The method of claim 10, wherein said gas containing NO x is subjected to a desulfurization step prior to introducing to said stream of active nitrogen.
Claim 14
Dependent Claim
29 words
The method of claim 10, wherein O 2 and H 2 O are removed from said gas containing NO x prior to introducing to said stream of active nitrogen.
References Cited (Backward Citations)
US3862043A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |