US3323710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan impeller
Assignee: Woods of Colchester Ltd
•
Filing: 1964-12-02
•
Granted: 1967-06-06
•
Expires: 1984-12-02
Abstract
No abstract record available.
Inventors
- 👤 Daly Brian Bowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:18
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/34; F04D29/36; F04D29/28; F04D29/287
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A FAN IMPELLER COMPRISING A HUB HAVING A PLURALITY OF SIMILARLY DISPOSED RECESSES THEREIN, A PLURALITY OF SIMILAR BLADES, EACH BLADE HAVING A ROOT RIGID THEREWITH AND SEATED IN ITS CORRESPONDING RECESS AND ADJUSTABLE ABOUT AN AXIS WHICH IS AT A SUBSTANTIAL INCLINATION TO THE AXIS OF ROTATION OF THE IMPELLER, AND A SCREW MEMBER DISPOSED AXIALLY OF EACH ROOT WHICH WHEN TIGHTENED HOLDS THE ROOT FIRMLY IN THE RECESS IN WHICH IT IS SEATED, THE BLADE ROOTS EACH TAPERING TOWARDS THE AXIS OF ROTATION OF THE IMPELLER WITH A MINIMUM INCLUDED ANGLE NOT LESS THAN TWICE THE ANGLE OF INCLINATION OF THE BLADE ROOT AXIS TO A LINE WHICH DOES NOT COINCIDE WITH THE ROOT OF AXIS AND WHICH IS AT AN ANGLE TO THE AXIS OF ROTATION OF THE IMPELLER WHICH IS BETWEEN 0* AND 90*, AND A TAPERED WASHER INTERPOSED BE-
Claim 2
Dependent Claim
144 words
A FAN IMPELLER COMPRISING A HUB HAVING A PLURALITY OF SIMILARLY DISPOSED RECESSES THEREIN, A PLURALITY OF SIMILAR BLADES, EACH BLADE HAVING A ROOT RIGID THEREWITH AND SEATED IN ITS CORRESPONDING RECESS AND ADJUSTABLE ABOUT AN AXIS WHICH IS AT A SUBSTANTIAL INCLINATION TO THE AXIS OF ROTATION OF THE IMPELLER, AND A SCREW MEMBER DISPOSED AXIALLY OF EACH ROOT WHICH WHEN TIGHTENED HOLDS THE ROOT FIRMLY IN THE RECESS IN WHICH IT IS SEATED, THE BLADE ROOTS EACH TAPERING TOWARDS THE AXIS OF ROTATION OF THE IMPELLER WITH A MINIMUM INCLUDED ANGLE NOT LESS THAN TWICE THE ANGLE OF INCLINATION OF THE BLADE ROOT AXIS TO A LINE WHICH DOES NOT COINCIDE WITH THE ROOT OF AXIS AND WHICH IS AT AN ANGLE TO THE AXIS OF ROTATION OF THE IMPELLER WHICH IS BETWEEN 0* AND 90*, AND A TAPERED WASHER INTERPOSED BE-
References Cited (Backward Citations)
CA511976A
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CA566698A
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DE949899C
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US2477954A
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US2664961A
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US2811303A
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FR1126364A
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US2776107A
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US2972441A
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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) | 1970-06-05 | 1970-12-05 | 1971-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-05 | 1974-12-05 | 1975-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-05 | 1978-12-05 | 1979-06-06 | $7700.00 | Window Closed / Lapsed |