US2550810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for cooling air or oxygen enriched air within an enclosure
Assignee: Airco Inc
•
Filing: 1947-02-12
•
Granted: 1951-05-01
•
Expires: 1967-02-12
Abstract
No abstract record available.
Inventors
- 👤 Jay A Heidbrink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:54
CPC Classifications
F; F24; F24F; F24F1/00; F24F1/02; F24F1/04; A; A61; A61G; A61G10/00; A61G10/04; F24F1/022; Y; Y10; Y10S; Y10S55/00; Y10S55/29
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2310222A
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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) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |