US3558283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Determination of reactive hydrocarbons in air
Assignee: MSA Safety Inc
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Filing: 1967-06-09
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Granted: 1971-01-26
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Expires: 1987-06-09
Abstract
Abstract REACTIVE HYDROCARBONS (RH) IN AUTOMOTIVE EXHAUST GASES ARE DETERMINED BY THE DIFFERENCES IN HEAT EFFECT OF COMBUSTION UPON THE GASES WITH AND WITHOUT THEIR CONTENT OF RH. PREFERABLY, THIS IS ACCOMPLISHED BY SUBJECTING A STREAM OF THE EXHAUST GASES TO COMBUSTION, THEN REMOVING THE RH FROM THE STREAM AND AGAIN SUBJECTING IT TO COMBUSTION, THE CONTENT OF REACTIVE HUDROCARBONS BEING DETERMINED AS A FUNCTION OF THE DIFFERENCE IN THE HEATS OF COMBUSTION BEFORE AND AFTER REMOVAL OF THE RH. THE RH REMOVAL IS EFFECTED BY PASSAGE OF THE GASES THROUGH A BODY OF ACID-RESISTANT GRANULAR MATERIAL IMPREGNATED WITH AN ANHYDROUS SOLUTION OF SULFURIC ACID AND AN ALKALI METAL DICHROMATE.
Inventors
- 👤 William R Freeman
- 👤 Karl J Bombaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:23
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/14; G01N27/16; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0022; G01N33/0024; Y; Y10; Y10T; Y10T436/00; Y10T436/21; Y10T436/218
Claims Analysis
Total Claims: 0
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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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |