US2805134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustible gas indicator and filament therefor
Assignee: MSA Safety Inc
•
Filing: 1954-12-15
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Granted: 1957-09-03
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Expires: 1974-12-15
Abstract
No abstract record available.
Inventors
- 👤 John P Strange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:32
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/14; G01N27/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
IN A COMBUSTIBLE GAS INDICATOR COMPRISING A DETECTOR FILAMENT, MEANS FOR PASSING GAS TO BE TESTED OVER SAID FILAMENT, A SOURCE OF ELECTRIC CURRENT ASSOCIATED WITH SAID FILAMENT FOR HEATING IT TO A PREDETERMINED TEMPERATURE, AND ELECTRICAL MEANS RESPONSIVE TO INCREASE OF TEMPERATURE OF SAID FILAMENT DUE TO THE PRESENCE OF A COMBUSTIBLE CONSTITUENT IN SAID GAS, THE IMPROVEMENT CONSISTING IN PROVIDING SAID DETECTOR FILAMENT AS A METALLIC WIRE HAVING A NARROW BAND AT THE MID-SECTION SURROUNDED BY A THIN AND ADHERENT COATING OF GLASS THE MELTING POINT OF WHICH IS BAOVE THE TEMPERATURE AT WHICH THE DETECTOR FILAMENT IS OPERATED.
Claim 2
Dependent Claim
101 words
IN A COMBUSTIBLE GAS INDICATOR COMPRISING A DETECTOR FILAMENT, MEANS FOR PASSING GAS TO BE TESTED OVER SAID FILAMENT, A SOURCE OF ELECTRIC CURRENT ASSOCIATED WITH SAID FILAMENT FOR HEATING IT TO A PREDETERMINED TEMPERATURE, AND ELECTRICAL MEANS RESPONSIVE TO INCREASE OF TEMPERATURE OF SAID FILAMENT DUE TO THE PRESENCE OF A COMBUSTIBLE CONSTITUENT IN SAID GAS, THE IMPROVEMENT CONSISTING IN PROVIDING SAID DETECTOR FILAMENT AS A METALLIC WIRE HAVING A NARROW BAND AT THE MID-SECTION SURROUNDED BY A THIN AND ADHERENT COATING OF GLASS THE MELTING POINT OF WHICH IS BAOVE THE TEMPERATURE AT WHICH THE DETECTOR FILAMENT IS OPERATED.
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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) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |