US3674436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas analyzer for internal combustion engines
Assignee: Individual
•
Filing: 1969-08-22
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Granted: 1972-07-04
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Expires: 1989-08-22
Abstract
Abstract AN EXHAUST GAS ANALYZER WHICH COMBINES THE KNOWN MEASURE OF EXHAUST GASES BASED UPON THE THERMAL CONDUCTIVITY OF THE EXHAUST GASES AND THE KNOWN MEASURE BASED UPON THE CATALYTICAL BURNING OF THE EXHAUST GASES INTO A NOVEL SYSTEM, ACCORDING TO WHICH THE OUTPUT SIGNALS OBTAINED BY THESE TWO MEASUREMENTS, MADE SIMULTANEOUSLY, ARE SUBTRACTED FROM EACH OTHER. THIS RESULTS IN AN ANALYZER WHICH HAS AN UNEQUIVOCAL INDICATION IN THE REGION BELOW AND ABOVE THE STOICHIOMETRICAL POINT.
Inventors
- 👤 Herman R Geul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:24
CPC Classifications
G; G01; G01M; G01M15/00; G01M15/04; G01M15/10; G01M15/102; G01M15/104; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/14; G01N27/18; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0027; G01N33/0031; G01N33/0032; Y; Y10; Y10T; Y10T436/00; Y10T436/20; Y10T436/207497; Y10T436/208339; Y10T436/21; Y10T436/218
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
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 |