US3145978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air heaters
Assignee: American Air Filter Co Inc
•
Filing: 1962-12-21
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Granted: 1964-08-25
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Expires: 1982-12-21
Abstract
No abstract record available.
Inventors
- 👤 Charles G Tolson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:29
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/20; F24H9/2064; F24H9/2085; F24H3/00; F24H3/02; F24H3/04; F24H3/0488; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
118 words
AXIAL FLOW FAN APPARATUS FOR SUPPLYING COMBUSTION AIR TO AN AIR HEATER, COMPRISING: (A) AN AIR INLET RING AND A PROPELLER FAN THEREIN FOR CAUSING AIR FLOW THROUGH SAID RING; (B) MEANS SUPPORTING SAID FAN FOR AXIAL MOVEMENT RELATIVE TO SAID RING; (C) MEANS URGING SAID FAN IN OPPOSITION TO THE AXIAL THRUST DEVELOPED BY SAID FAN TOWARD A MAXIMUM VOLUME POSITION OF SAID FAN RELATIVE TO SAID RING UNDER A LOW DENSITY OF AIR CONDITION; (D) SAID LAST-MENTIONED MEANS BEING YIELDABLE IN RESPONSE TO AN INCREASED AXIAL THRUST DEVELOPED BY SAID FAN ARISING FROM AN INCREASED AIR DENSITY CONDITION FOR PERMITTING DISPLACEMENT OF SAID FAN AWAY FROM SAID MAXIMUM VOLUME POSITION AND TO A REDUCED VOLUME POSITION.
References Cited (Backward Citations)
FR904849A
Cited
US2692080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-25 | 1968-02-24 | 1968-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-25 | 1972-02-24 | 1972-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-25 | 1976-02-24 | 1976-08-25 | $7700.00 | Window Closed / Lapsed |