US2471980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Damper
Assignee: Individual
•
Filing: 1945-05-01
•
Granted: 1949-05-31
•
Expires: 1965-05-01
Abstract
No abstract record available.
Inventors
- 👤 John E Maynard
- 👤 Paul O Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:57
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; F24F13/10; F24F13/14; F24F13/1426; F24F2013/146
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CH3955A
Cited
US711653A
Cited
US852063A
Cited
US1063645A
Cited
US1062177A
Cited
FR689188A
Cited
US2177931A
Cited
US2284912A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-30 | 1952-11-29 | 1953-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-30 | 1956-11-29 | 1957-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-30 | 1960-11-29 | 1961-05-31 | $7700.00 | Window Closed / Lapsed |