US3977831A
Expired / Lapsed
US
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Method for detecting pollutants
Assignee: National Aeronautics and Space Administration
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Filing: 1974-12-30
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Granted: 1976-08-31
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Expires: 1994-12-30
Abstract
Abstract A method for detecting and measuring trace amounts of pollutants of the group consisting of ozone, nitrogen dioxide and carbon monoxide in a gaseous environment wherein a sample organic solid material that will undergo a chemical reaction with the test pollutant is exposed to the test environment and thereafter, when heated in the temperature range of 100°-200°C., undergoes chemiluminescence that is measured and recorded as a function of concentration of the test pollutant and wherein the chemiluminescence of the solid organic material is specific to the pollutant being tested.
Inventors
- 👤 with respect to an invention of Fletcher James C. Administrator of the National Aeronautics and Space Administration
- 👤 Robert S. Rogowski
- 👤 Ralph R. Richards
- 👤 Edmund J. Conway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:07
CPC Classifications
G; G01; G01N; G01N31/00; G01N21/00; G01N21/75; G01N21/76; G01N21/766; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0011; G01N33/0013; Y; Y10; Y10T; Y10T436/00; Y10T436/17; Y10T436/177692; Y10T436/178459; Y10T436/20; Y10T436/204998; Y10T436/205831; Y10T436/206664
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
134 words
A method for detecting and measuring trace amounts of pollutants of the group consisting of ozone, nitrogen dioxide and carbon monoxide in a gaseous environment comprising: selecting a sample organic solid having the inherent property characteristics of chemically reacting with the gaseous pollutant being tested and thereafter undergoing chemiluminesence when heated, exposing the selected sample organic solid material to an environment suspected of containing at least one of said pollutants, and reacting said solid material with said one of said pollutants, heating the reacted sample organic solid material in the temperature range of 100°-200°C. for approximately one minute, detecting and measuring the light output from the sample solid organic material during the heating cycle, recording the total integrated light intensity measured during the heating cycle as a concentration of the specific pollutant being tested.
Claim 2
Independent Claim
134 words
A method for detecting and measuring trace amounts of pollutants of the group consisting of ozone, nitrogen dioxide and carbon monoxide in a gaseous environment comprising: selecting a sample organic solid having the inherent property characteristics of chemically reacting with the gaseous pollutant being tested and thereafter undergoing chemiluminesence when heated, exposing the selected sample organic solid material to an environment suspected of containing at least one of said pollutants, and reacting said solid material with said one of said pollutants, heating the reacted sample organic solid material in the temperature range of 100°-200°C. for approximately one minute, detecting and measuring the light output from the sample solid organic material during the heating cycle, recording the total integrated light intensity measured during the heating cycle as a concentration of the specific pollutant being tested.
Claim 3
Dependent Claim
33 words
The method of claim 1 wherein the atmospheric pollutant tested is ozone and the sample organic solid is selected from the group consisting of rubrene, poly(ethylene 2,6 naphthalene dicarboxylate), and 9,10 diphenyl anthracene.
Claim 4
Dependent Claim
17 words
The method of claim 2 wherein the sample organic solid is a thin vapor deposited rubrene layer.
Claim 5
Dependent Claim
31 words
The method of claim 1 wherein the atmospheric pollutant tested is nitrogen dioxide and the sample organic solid is selected from the group consisting of 3,5 diaminobenzoic acid and polyvinyl alcohol.
Claim 6
Dependent Claim
20 words
The method of claim 1 wherein the atmospheric pollutant tested is carbon monoxide and the organic solid is polyvinyl pyrrolidone.
Claim 7
Dependent Claim
26 words
The method of claim 1 wherein the atmospheric pollutant tested is ozone and the exposure to the solid organic solid is in the absence of light.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |