US3674435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low concentration constituent of gaseous mixture selective converter and detector
Assignee: Environment One Corp
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Filing: 1970-06-05
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Granted: 1972-07-04
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Expires: 1990-06-05
Abstract
Abstract ACCURATE MEASUREMENT OF THE CONCENTRATION LEVEL OF A FIRST SELECTED GASEOUS MATERIAL IN A SAMPLE ATMOSPHERE HAVING PRESENT THEREIN A SECOND INTERFERING ASEOUS MATERIAL IS OBTAINED BY SELECTIVELY REDUCING THE CONCENTRATION OF THE SECOND INTERFERING GASEOUS MATERIAL WHILE MAINTAINING THE PROPORTIONATE CONCENTRATION LEVEL OF THE SELECTED GASEOUS MATERIAL AT A MEASURABLE LEVEL. THE SELECTED GASEOUS MATERIAL IS THEN CONVERTED INTO CONDENSATION NUCLEI WHICH IN TURN ARE MEASURED TO YIELD AN ACCURATE INDICATION OF THE CONCENTRATION OF THE SELECTED GASEOUS MATERIAL IN THE SAMPLE ATMOSPHERE.
Inventors
- 👤 Frank W Van Luik Jr
- 👤 Peter E Coffey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:05
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0011; G01N33/0014; G01N15/00; G01N15/06; G01N15/065; G01N1/00; G01N1/28; G01N1/40; G01N1/4005; G01N2001/4016; Y; Y10; Y10T; Y10T436/00; Y10T436/17; Y10T436/177692; Y10T436/178459; Y10T436/18; Y10T436/186
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |