US3227643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen detector
Assignee: University of North Carolina at Chapel Hill
•
Filing: 1962-11-13
•
Granted: 1966-01-04
•
Expires: 1982-11-13
Abstract
No abstract record available.
Inventors
- 👤 Daniel A Okun
- 👤 Charles N Reilley
- 👤 Khalil H Mancy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:23
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/404
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2414411A
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US2651612A
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US2913386A
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US3000805A
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US2943028A
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US3098813A
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US3071530A
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US3051631A
Cited
US3088905A
Cited
US3070539A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |