US2800851A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilator with movable louvers
Assignee: KRONRAD
•
Filing: 1953-07-10
•
Granted: 1957-07-30
•
Expires: 1973-07-10
Abstract
No abstract record available.
Inventors
- 👤 Kronrad Julius
- 👤 Earle W Kirkwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:25
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/007; F24F7/013; F24F13/00; F24F13/08; F24F13/10; F24F13/14; F24F13/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2158413A
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US2196308A
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US2293065A
Cited
US2308965A
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US2390227A
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US2608751A
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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) | 1960-07-29 | 1961-01-28 | 1961-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-29 | 1965-01-28 | 1965-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-29 | 1969-01-28 | 1969-07-30 | $7700.00 | Window Closed / Lapsed |