US2783702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable vortex damper
Assignee: Air Devices Inc
•
Filing: 1950-09-30
•
Granted: 1957-03-05
•
Expires: 1970-09-30
Abstract
No abstract record available.
Inventors
- 👤 Cortland N O'day
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:45
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; F24F13/10; F24F13/14; F24F13/142
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1380567A
Cited
US1659880A
Cited
FR709120A
Cited
DE706489C
Cited
US2369303A
Cited
US2474068A
Cited
US2517303A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-04 | 1960-09-03 | 1961-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-04 | 1964-09-03 | 1965-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-04 | 1968-09-03 | 1969-03-05 | $7700.00 | Window Closed / Lapsed |