Patent US2800851A successfully refreshed from Google Patents.
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 07:26
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
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1014058A
Cited
US1372500A
Cited
US1403054A
Cited
US1383469A
Cited
US1871161A
Cited
US2021408A
Cited
US2009740A
Cited
US2124716A
Cited
US2159696A
Cited
US2158413A
Cited
US2196308A
Cited
US2293065A
Cited
US2308965A
Cited
US2390227A
Cited
US2608751A
Cited
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 |