US923437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-cooling apparatus.
Assignee: Individual
•
Filing: 1907-10-26
•
Granted: 1909-06-01
•
Expires: 1927-10-26
Abstract
No abstract record available.
Inventors
- 👤 William A Merralls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:24
CPC Classifications
F; F24; F24F; F24F5/00; F24F5/0007; F24F5/0035
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) | 1912-05-31 | 1912-11-30 | 1913-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1916-05-31 | 1916-11-30 | 1917-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1920-05-31 | 1920-11-30 | 1921-06-01 | $7700.00 | Window Closed / Lapsed |