US2652193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating fan
Assignee: Emerson Electric Co
•
Filing: 1947-10-25
•
Granted: 1953-09-15
•
Expires: 1967-10-25
Abstract
No abstract record available.
Inventors
- 👤 Caryl A Lindberg
- 👤 Howard W Eckles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:36
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/60; F04D29/64; F04D29/644; F04D29/646
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1715669A
Cited
US1712698A
Cited
US2181596A
Cited
US2331056A
Cited
US2294399A
Cited
US2310772A
Cited
US2342596A
Cited
US2398380A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-14 | 1957-03-16 | 1957-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-14 | 1961-03-16 | 1961-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-14 | 1965-03-16 | 1965-09-15 | $7700.00 | Window Closed / Lapsed |