US3347635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas analysis method
Assignee: GA Technologies Inc
•
Filing: 1963-05-20
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Granted: 1967-10-17
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Expires: 1983-05-20
Abstract
No abstract record available.
Inventors
- 👤 John M Mckee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:55
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/122; G01N27/123
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
THE METHOD OF DETECTING THE PRESENCE OF AN DETERMINING THE CONCENTRATION OF A GASEOUS IMPURITY IN A NOMINALLY INERT GASEOUS ATMOSPHERE, COMPRISING THE STEPS OF: (A) INTRODUCING AN ELECTRICALLY RESISTIVE METALLIC FILAMENT INTO THE NOMINALLY INERT GASEOUS ATMOSPHERE SAID FILAMENT BEING CHEMICALLY REACTIVE WITH SUCH GASEOUS IMPURITY; (B) HEATING SAID FILAMENT TO ACCELERATE THE SUSCEPTIBILITY THEREOF TO CHEMICAL REACTION WITH SUCH GASEOUS IMPURITY; AND (C) DETECTING THE RATE OF CHANGE OF RESISTANCE WITH RESPECT TO TIME OF SAID FILAMENT DURING THE INITIAL MINUTES OF THE PERIOD OF HEATING FILAMENT, WHEREIN SAID RATE OF CHANGE IS RELATED TO AND INDICATIVE OF THE CONCENTRATION OF SUCH GASEOUS IMPURITY.
Claim 2
Independent Claim
106 words
THE METHOD OF DETECTING THE PRESENCE OF AN DETERMINING THE CONCENTRATION OF A GASEOUS IMPURITY IN A NOMINALLY INERT GASEOUS ATMOSPHERE, COMPRISING THE STEPS OF: (A) INTRODUCING AN ELECTRICALLY RESISTIVE METALLIC FILAMENT INTO THE NOMINALLY INERT GASEOUS ATMOSPHERE SAID FILAMENT BEING CHEMICALLY REACTIVE WITH SUCH GASEOUS IMPURITY; (B) HEATING SAID FILAMENT TO ACCELERATE THE SUSCEPTIBILITY THEREOF TO CHEMICAL REACTION WITH SUCH GASEOUS IMPURITY; AND (C) DETECTING THE RATE OF CHANGE OF RESISTANCE WITH RESPECT TO TIME OF SAID FILAMENT DURING THE INITIAL MINUTES OF THE PERIOD OF HEATING FILAMENT, WHEREIN SAID RATE OF CHANGE IS RELATED TO AND INDICATIVE OF THE CONCENTRATION OF SUCH GASEOUS IMPURITY.
References Cited (Backward Citations)
US2251751A
Cited
US2219540A
Cited
US2298288A
Cited
US2349250A
Cited
US2904406A
Cited
US2888330A
Cited
US3222920A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |