Patent US2253406A successfully refreshed from Google Patents.
US2253406A
Expired / Lapsed
US
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Air delivery device
Assignee: ALBERT W ROCKWOOD
•
Filing: 1938-05-31
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Granted: 1941-08-19
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Expires: 1958-05-31
Abstract
No abstract record available.
Inventors
- 👤 George B Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:57
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/287
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) | 1944-08-18 | 1945-02-17 | 1945-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-08-18 | 1949-02-17 | 1949-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-08-18 | 1953-02-17 | 1953-08-19 | $7700.00 | Window Closed / Lapsed |