US3582274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of analyzing breath for ethyl alcohol
Assignee: FREDERICK G KEYES
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Filing: 1969-06-24
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Granted: 1971-06-01
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Expires: 1989-06-24
Abstract
Abstract IN THE QUANTITATIVE ANALYSIS FOR ETHYL ALCOHOL OF A SAMPLE OF BREATH BY THE METHOD COMPRISING CONTACTING THE SAMPLE WITH A SOLUTION OF CHROMATE IONS AND MEASURING THE DECREASE OF CHROMATE ION CONCENTRATION, THE SAMPLE IS CONTACTED WITH A SOLUTION COMPRISING A CHROMATE COMPOUND IN AQUEOUS NITRIC ACID. THE OXIDATION REACTION OF BREATH ALCOHOL WITH THIS SOLUTION HAS A RAPIDLY SUITABLE FOR EVERY PRACTICAL PURPOSE IN BREATH TESTING FOR ALCOHOL.
Inventors
- 👤 Frederick G Keyes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:36
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/22; Y; Y10; Y10S; Y10S436/00; Y10S436/90; Y10T; Y10T436/00; Y10T436/20; Y10T436/203332; Y10T436/204165
Claims Analysis
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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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |