US2428277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Humidifier for oxygen gas
Assignee: Airco Inc
•
Filing: 1944-08-25
•
Granted: 1947-09-30
•
Expires: 1964-08-25
Abstract
No abstract record available.
Inventors
- 👤 Jay A Heidbrink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:00
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/10; A61M16/14; A61M16/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1195315A
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US1438926A
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DE398640C
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US1746089A
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US1766124A
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US2003363A
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US2109743A
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US2238280A
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US2212288A
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US2245696A
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US2251790A
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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) | 1950-09-29 | 1951-03-31 | 1951-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-29 | 1955-03-31 | 1955-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-29 | 1959-03-31 | 1959-09-30 | $7700.00 | Window Closed / Lapsed |