US3117225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromatography for measuring traces of impurities in a gas
Assignee: Imperial Chemical Industries Ltd
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Filing: 1960-03-23
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Granted: 1964-01-07
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Expires: 1980-03-23
Abstract
No abstract record available.
Inventors
- 👤 Willis Vincent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:51
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/62; G01N30/64; G01N30/70; G01N27/00; G01N27/62; G01N27/64; G01N27/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN A PROCESS OF GAS DETECTION COMPRISING MIXING A SAMPLE TO BE DETECTED WITH A NOBLE GAS AS A CARRIER GAS, PASSING A STREAM OF THE RESULTING MIXTURE THROUGH AN IONISATION CHAMBER, IONISING THE GAS MIXTURE BY MEANS OF A RADIOACTIVE SOURCE, AND DETECTING FLUCTUATIONS IN THE DEGREE OF IONISATION PRODUCED, THE IMPROVEMENT WHICH COMPRISES CONTINUOUSLY HAVING IN THE SAID STREAM IN THE IONISATION CHAMBER A KNOWN, RELATIVELY SMALL, SUBSTANTIALLY CONSTANT AMOUNT OF A SUBSTANCE IN THE GASEOUS PHASE, WHICH SUBSTANCE HAS AN IONISATION POTENTIAL WHICH IS AT MOST SUBSTANTIALLY EQUAL TO THE EXCITATION POTENTIAL OF METASTABLE ATOMS OF THE NOBLE GAS.
Claim 2
Dependent Claim
102 words
IN A PROCESS OF GAS DETECTION COMPRISING MIXING A SAMPLE TO BE DETECTED WITH A NOBLE GAS AS A CARRIER GAS, PASSING A STREAM OF THE RESULTING MIXTURE THROUGH AN IONISATION CHAMBER, IONISING THE GAS MIXTURE BY MEANS OF A RADIOACTIVE SOURCE, AND DETECTING FLUCTUATIONS IN THE DEGREE OF IONISATION PRODUCED, THE IMPROVEMENT WHICH COMPRISES CONTINUOUSLY HAVING IN THE SAID STREAM IN THE IONISATION CHAMBER A KNOWN, RELATIVELY SMALL, SUBSTANTIALLY CONSTANT AMOUNT OF A SUBSTANCE IN THE GASEOUS PHASE, WHICH SUBSTANCE HAS AN IONISATION POTENTIAL WHICH IS AT MOST SUBSTANTIALLY EQUAL TO THE EXCITATION POTENTIAL OF METASTABLE ATOMS OF THE NOBLE GAS.
References Cited (Backward Citations)
US3009063A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-06 | 1967-07-08 | 1968-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-06 | 1971-07-08 | 1972-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-06 | 1975-07-08 | 1976-01-07 | $7700.00 | Window Closed / Lapsed |