US3117716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ducted rotor
Assignee: Bell Aerospace Corp
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Filing: 1963-04-10
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Granted: 1964-01-14
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Expires: 1983-04-10
Abstract
No abstract record available.
Inventors
- 👤 Rodney K Wernicke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:34
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/20; F01D11/00; F01D11/08; F01D11/12; F01D11/14; F01D11/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
182 words
A DUCTED FAN ASSEMBLY COMPRISING, IN COMBINATION, A CYLINDRICAL SHROUD, A FAN BLADE ROTABLY MOUNTED CONCENTRICALLY WITHIN SAID SHROUD AND HAVING AN END PORTION TERMINATING CLOSELY ADJACENT TO BUT SPACED FROM THE INNER SURFACE OF SAID SHROUD, SAID END PORTION OF THE BLADE HAVING A RECESS THEREIN OPENING TOWARD SAID INNER SURFACE OF THE SHROUD, A SHOE DEVICE SLIDABLY RECEIVED IN SAID RECESS FOR MOVEMENT BEYOND SAID END PORTION OF THE BLADE TOWARD CONTACT WITH THE INNER SURFACE OF SAID SHROUD UNDER THE INFLUENCE OF CENTRIFUGAL FORCE EFFECTED BY ROTATION OF SAID BLADE, MEANS FOR ROTATING SAID BLADE IN A PREDETERMINED DIRECTION, SAID SHOE HAVING AN ARCUATE OUTER END FACE OF SUBSTANTIALLY THE SAME RADIUS OF CURVATURE AS THE INNER SUREFACE OF SAID SHROUD, AND MEANS FOR FORMING A CUSHION OF AIR BETWEEN SAID SHOE AND SAID INNER SURFACE OF THE SHROUD TO MAINTAIN SAID SHOE OUT OF CONTACT WITH SUCH INNER SURFACE OF THE SHROUD, SAID MEANS COMPRISING A LEADING EDGE OUTER END FACE OF SAID SHOE WHICH IS OF LESSER RADIUS OF CURVATURE THAN SAID INNER SURFACE OF THE SHROUD.
Claim 2
Dependent Claim
182 words
A DUCTED FAN ASSEMBLY COMPRISING, IN COMBINATION, A CYLINDRICAL SHROUD, A FAN BLADE ROTABLY MOUNTED CONCENTRICALLY WITHIN SAID SHROUD AND HAVING AN END PORTION TERMINATING CLOSELY ADJACENT TO BUT SPACED FROM THE INNER SURFACE OF SAID SHROUD, SAID END PORTION OF THE BLADE HAVING A RECESS THEREIN OPENING TOWARD SAID INNER SURFACE OF THE SHROUD, A SHOE DEVICE SLIDABLY RECEIVED IN SAID RECESS FOR MOVEMENT BEYOND SAID END PORTION OF THE BLADE TOWARD CONTACT WITH THE INNER SURFACE OF SAID SHROUD UNDER THE INFLUENCE OF CENTRIFUGAL FORCE EFFECTED BY ROTATION OF SAID BLADE, MEANS FOR ROTATING SAID BLADE IN A PREDETERMINED DIRECTION, SAID SHOE HAVING AN ARCUATE OUTER END FACE OF SUBSTANTIALLY THE SAME RADIUS OF CURVATURE AS THE INNER SUREFACE OF SAID SHROUD, AND MEANS FOR FORMING A CUSHION OF AIR BETWEEN SAID SHOE AND SAID INNER SURFACE OF THE SHROUD TO MAINTAIN SAID SHOE OUT OF CONTACT WITH SUCH INNER SURFACE OF THE SHROUD, SAID MEANS COMPRISING A LEADING EDGE OUTER END FACE OF SAID SHOE WHICH IS OF LESSER RADIUS OF CURVATURE THAN SAID INNER SURFACE OF THE SHROUD.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-13 | 1967-07-15 | 1968-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-13 | 1971-07-15 | 1972-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-13 | 1975-07-15 | 1976-01-14 | $7700.00 | Window Closed / Lapsed |