US3606593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust fan
Assignee: Emerson Electric Co
•
Filing: 1969-06-30
•
Granted: 1971-09-20
•
Expires: 1989-06-30
Abstract
Abstract A COMPACT, LOW-COST, EXHAUST FAN FOR MOUNTING WITHIN A ROOM PARTITIONING WALL OR CEILING COMPRISING, A BLOWER HOUSING HAVING AN OUTLET OFFSET FROM AND PERPENDICULAR TO ITS INLET AND AN AXIAL FLOW TYPE FAN THEREIN, WITH ITS AXIS CENTERED IN THE INLET AND LYING AT AN ACUTE ANGLE THERETO AND ARRANGED TO MOVE AIR THROUGH THE HOUSING BY CENTRIFUGAL FORCE AS WELL AS BY THE PITCH OF THE FAN BLADES.
Inventors
- 👤 Robert E Steiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:25
CPC Classifications
F; F04; F04D; F04D17/00; F04D17/08; F04D17/16; F24; F24F; F24F7/00; F24F7/04; F24F7/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |