US2023876A
Expired / Lapsed
US
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Air cooling apparatus
Assignee: CHARLES H CANODE
•
Filing: 1933-06-10
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Granted: 1935-12-10
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Expires: 1953-06-10
Abstract
No abstract record available.
Inventors
- 👤 Dubrovin John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:53
CPC Classifications
F; F24; F24F; F24F5/00; F24F5/0007; F24F1/00; F24F1/0007; F24F1/0035; F24F1/0043; F24F1/0057; F24F1/0083; F24F1/02; F24F1/028; F24F1/0284; F24F1/03; F24F1/031; F24F1/032; F24F1/0323; F24F1/0325; F24F1/0358; Y; Y02; Y02B; Y02B30/00; Y02B30/54; Y10; Y10S; Y10S261/00; Y10S261/34
Claims Analysis
Total Claims: 0
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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) | 1938-12-09 | 1939-06-10 | 1939-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-12-09 | 1943-06-10 | 1943-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-12-09 | 1947-06-10 | 1947-12-10 | $7700.00 | Window Closed / Lapsed |