Patent US3840342A successfully refreshed from Google Patents.
US3840342A
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Nitrogen dioxide conversion
Assignee: Rosemount Inc
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Filing: 1971-07-02
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Granted: 1974-10-08
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Expires: 1991-07-02
Abstract
Abstract The method of converting nitrogen dioxide to nitric oxide which includes maintaining the nitrogen dioxide at a temperature from about 40*C to about 130*C. The nitrogen dioxide is exposed to ultraviolet radiation, whereby the nitrogen dioxide is converted to nitric oxide. A method of measuring nitrogen dioxide utilizing this conversion is also disclosed.
Inventors
- 👤 R Neti
- 👤 R Rocks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:25
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/75; G01N21/76; G01N21/766; C; C01; C01B; C01B21/00; C01B21/20; C01B21/24; C01B21/26; C01B21/262; Y; Y10; Y10T; Y10T436/00; Y10T436/17; Y10T436/177692; Y10T436/178459
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
81 words
THE METHOD OF CONVERTING NITROGEN DIOXIDE TO NITRIC OXIDE WHICH COMPRISES A. SUBJECTING AIR AT SUBSTANTIALLY ATMOSPHERIC PRESSURE CONTAINING NITROGEN DIOXIDE IN THE RANGE BETWEEN A FEW PARTS PER BILLION AND SEVERAL HUNDRED PARTS PER MILLION TO HEAT AND ARTIFICAL ULTRAVIOLET RADIATION WHILE B. MAINTAINING THE NITROGEN DIOXIDE AT A TEMPERATURE FROM ABOUT 40*C TO ABOUT 130*C; AND C. EXPOSING THE NITROGEN DIOXIDE TO ULTRAVIOLET RADIATION FROM AN ARTIFICAL SOURCE AT WAVELENGTHS SUFFICIENT TO CONVERT THE NITROGEN DIOXIDE TO NITRIC OXIDE.
Claim 2
Independent Claim
81 words
THE METHOD OF CONVERTING NITROGEN DIOXIDE TO NITRIC OXIDE WHICH COMPRISES A. SUBJECTING AIR AT SUBSTANTIALLY ATMOSPHERIC PRESSURE CONTAINING NITROGEN DIOXIDE IN THE RANGE BETWEEN A FEW PARTS PER BILLION AND SEVERAL HUNDRED PARTS PER MILLION TO HEAT AND ARTIFICAL ULTRAVIOLET RADIATION WHILE B. MAINTAINING THE NITROGEN DIOXIDE AT A TEMPERATURE FROM ABOUT 40*C TO ABOUT 130*C; AND C. EXPOSING THE NITROGEN DIOXIDE TO ULTRAVIOLET RADIATION FROM AN ARTIFICAL SOURCE AT WAVELENGTHS SUFFICIENT TO CONVERT THE NITROGEN DIOXIDE TO NITRIC OXIDE.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the radiation is at wavelengths from about 1,849 A. to about 6,600 A.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein the radiation is at wavelengths from about 1,849 A. to about 4,070 A.
Claim 5
Dependent Claim
17 words
The method of claim 1 wherein the nitrogen dioxide is maintained at a temperature of about 130*C.
Claim 6
Dependent Claim
107 words
In the method of measuring nitrogen dioxide by converting nitrogen dioxide to nitric oxide, reacting the nitric oxide with ozone, and measuring the light emitted by the reaction, the improvement which comprises: a. subjecting air containing nitrogen dioxide in the range between a few parts per billion and several hundred parts per million to heat and artificial ultraviolet radiation at substantially atmospheric pressure b. maintaining the air containing nitrogen dioxide at a temperature from about 40*C to about 130*C; and c. exposing the air and nitrogen dioxide contained therein to ultraviolet radiation from the artificial source at wavelengths sufficient to convert the nitrogen dioxide to nitric oxide.
Claim 7
Dependent Claim
107 words
In the method of measuring nitrogen dioxide by converting nitrogen dioxide to nitric oxide, reacting the nitric oxide with ozone, and measuring the light emitted by the reaction, the improvement which comprises: a. subjecting air containing nitrogen dioxide in the range between a few parts per billion and several hundred parts per million to heat and artificial ultraviolet radiation at substantially atmospheric pressure b. maintaining the air containing nitrogen dioxide at a temperature from about 40*C to about 130*C; and c. exposing the air and nitrogen dioxide contained therein to ultraviolet radiation from the artificial source at wavelengths sufficient to convert the nitrogen dioxide to nitric oxide.
Claim 8
Dependent Claim
19 words
The method of claim 5 wherein the radiation is at wavelengths from about 1,849 A. to about 6,600 A.
Claim 9
Dependent Claim
19 words
The method of claim 5 wherein the radiation is at wavelengths from about 1,849 A. to about 4,070 A.
Claim 10
Dependent Claim
17 words
The method of claim 5 wherein the nitrogen dioxide is maintained at a temperature of about 130*C.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |