US2795756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas detection
Assignee: MSA Safety Inc
•
Filing: 1953-02-27
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Granted: 1957-06-11
•
Expires: 1973-02-27
Abstract
No abstract record available.
Inventors
- 👤 Moses G Jacobson
- 👤 Luca Frank J De
- 👤 Alexander C Mcinnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:18
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/404; G01N27/416; G01N27/4163; Y; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/6966
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
IN AN ELECTRICAL CIRCUIT FOR THE MEASUREMENT OF OXYGEN CONCENTRATION IN A MIXTURE OF GASES BY MEANS OF A DETECTOR CELL CIRCUIT SUBJECT TO DECAY OF ELECTRICAL OUTPUT, A FIRST AUXILIARY CIRCUIT POWERED BY AN AUXILIARY POWER SUPPLY SOURCE SUBJECT TO DECAY OF THE SAME ORDER OF MAGNITUDE AS THE DECAY OF SAID DETECTOR CELL CIRCUIT, MEANS FOR ADJUSTING THE DECAY RATE OF SAID AUXILIARY POWER SUPPLY SOURCE, AND CIRCUIT CONNECTIONS BETWEEN SAID AUXILIARY POWER SUPPLY SOURCE AND SAID DETECTOR CIRCUIT OPPOSING THE CURRENT AND DECAY FROM SAID SOURCES TO EACH OTHER IN PARTS OF THE CIRCUIT, A THIRD CIRCUIT POWERED BY AN INDEPENDENT SOURCE SUBJECT TO A RATE OF DECAY OF THE SAME ORDER AS THAT OF THE FIRST MENTIONED SOURCE, MEANS FOR AD-
Claim 2
Dependent Claim
125 words
IN AN ELECTRICAL CIRCUIT FOR THE MEASUREMENT OF OXYGEN CONCENTRATION IN A MIXTURE OF GASES BY MEANS OF A DETECTOR CELL CIRCUIT SUBJECT TO DECAY OF ELECTRICAL OUTPUT, A FIRST AUXILIARY CIRCUIT POWERED BY AN AUXILIARY POWER SUPPLY SOURCE SUBJECT TO DECAY OF THE SAME ORDER OF MAGNITUDE AS THE DECAY OF SAID DETECTOR CELL CIRCUIT, MEANS FOR ADJUSTING THE DECAY RATE OF SAID AUXILIARY POWER SUPPLY SOURCE, AND CIRCUIT CONNECTIONS BETWEEN SAID AUXILIARY POWER SUPPLY SOURCE AND SAID DETECTOR CIRCUIT OPPOSING THE CURRENT AND DECAY FROM SAID SOURCES TO EACH OTHER IN PARTS OF THE CIRCUIT, A THIRD CIRCUIT POWERED BY AN INDEPENDENT SOURCE SUBJECT TO A RATE OF DECAY OF THE SAME ORDER AS THAT OF THE FIRST MENTIONED SOURCE, MEANS FOR AD-
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) | 1960-06-10 | 1960-12-10 | 1961-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-10 | 1964-12-10 | 1965-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-10 | 1968-12-10 | 1969-06-11 | $7700.00 | Window Closed / Lapsed |