Patent US2581709A successfully refreshed from Google Patents.
US2581709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cooling system for tents or canopies
Assignee: Individual
•
Filing: 1950-01-21
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Granted: 1952-01-08
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Expires: 1970-01-21
Abstract
No abstract record available.
Inventors
- 👤 William J Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:30
CPC Classifications
A; A61; A61G; A61G10/00; A61G10/04; F; F24; F24F; F24F1/00; F24F1/02; F24F1/022; F24F1/04; A61M; A61M2205/00; A61M2205/36; A61M2205/3606
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2170992A
Cited
US1884898A
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US1909227A
Cited
US2104589A
Cited
US2186562A
Cited
US2170993A
Cited
US2282373A
Cited
US2240760A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |