US2424828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air mixing and distributing duct for air conditioning systems
Assignee: BF Sturtevant Co
•
Filing: 1944-08-19
•
Granted: 1947-07-29
•
Expires: 1964-08-19
Abstract
No abstract record available.
Inventors
- 👤 Charles R Keep
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:32
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/04; F24F7/00; F24F7/04; F24F7/06; F24F7/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2171622A
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US2320596A
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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) | 1950-07-28 | 1951-01-27 | 1951-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-28 | 1955-01-27 | 1955-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-28 | 1959-01-27 | 1959-07-29 | $7700.00 | Window Closed / Lapsed |