US2730943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Freeze-proof vent damper
Assignee: Individual
•
Filing: 1953-03-16
•
Granted: 1956-01-17
•
Expires: 1973-03-16
Abstract
No abstract record available.
Inventors
- 👤 Robert B Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:48
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; F24F13/10; F24F13/14; F24F13/1426
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US121639A
Cited
US1993069A
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US1064951A
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US1487828A
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US1575144A
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US2397803A
Cited
GB648119A
Cited
US2579395A
Cited
US2641987A
Cited
US2656784A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |