US4238194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nuclei analysis of solid substances
Assignee: General Electric Co
•
Filing: 1966-10-04
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Granted: 1980-12-09
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Expires: 1986-10-04
Abstract
Abstract The presence of red phosphorus in solid form is detected through the use of a condensation nuclei detector and the preliminary steps of reacting the phosphorus body with ozone and then removing solid particles from a sample of the resulting gas mixture and forming phosphoric acid nuclei in the filtered gas sample.
Inventors
- 👤 Stuart B. Dunham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:28
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0011; G01N33/0013; G01N15/00; G01N15/06; G01N15/065; Y; Y10; Y10T; Y10T436/00; Y10T436/16; Y10T436/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
104 words
A method for detecting a non-volatile solid substance which comprises the steps of introducing into the atmosphere surrounding the said solid substance a reagent selected from the group consisting of nitric acid, hydrochloric acid, ammonia and ozone and chemically reacting the said solid substance in the atmosphere and thereby producing a gas reaction mixture containing a gaseous reaction product of the non-volatile solid substance, selecting a sample of the resulting gas mixture, filtering the gas mixture sample and removing substantially all non-gaseous material therefrom, converting the said gaseous reaction product to condensation nuclei, and detecting the resulting condensation nuclei with a condensation nuclei detector.
Claim 2
Independent Claim
104 words
A method for detecting a non-volatile solid substance which comprises the steps of introducing into the atmosphere surrounding the said solid substance a reagent selected from the group consisting of nitric acid, hydrochloric acid, ammonia and ozone and chemically reacting the said solid substance in the atmosphere and thereby producing a gas reaction mixture containing a gaseous reaction product of the non-volatile solid substance, selecting a sample of the resulting gas mixture, filtering the gas mixture sample and removing substantially all non-gaseous material therefrom, converting the said gaseous reaction product to condensation nuclei, and detecting the resulting condensation nuclei with a condensation nuclei detector.
Claim 3
Dependent Claim
26 words
The process of claim 1 in which the non-volatile substance is red phosphorus and in which the gaseous reaction product is converted into phosphoric acid nuclei.
Claim 4
Dependent Claim
25 words
The process of claim 1 in which the non-volatile substance is sulfur and in which the gaseous reaction product is converted into sulfuric acid nuclei.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |