Patent US3209838A successfully refreshed from Google Patents.
US3209838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbine rotors
Assignee: Associated Electrical Industries Ltd
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Filing: 1963-07-29
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Granted: 1965-10-05
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Expires: 1983-07-29
Abstract
No abstract record available.
Inventors
- 👤 Frankel Adolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:25
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/22; F01D5/225
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A TURBINE ROTOR COMPRISING AT LEAST ONE ROTOR DISC; A CIRCUMFERENTIAL ROW OF ROTOR BLADES ON THE DISC; SOCKET MEANS FORMED AT THE TIP OF EACH ROTOR BLADE; BRACING RING SECTIONS JOINING ADJACENT BLADES IN THE CIRCUMFERENTIAL ROW ADJACENT THE TIP OF SAID BLADE; EACH BRACING RING SECTION EXTENDING BETWEEN TWO ADJACENT BLADES IN THE ROW; EACH BRACING RING SECTION HAVING ENLARGED PORTIONS AT EACH END THEREOF, SAID PORTIONS BEING SECURED IN SAID SOCKET MEANS FOR ATTACHING SAID BRACING RING SECTION TO THE ROTOR BLADES; AND EACH BRACING RING SECTION INCLUDING A CURVED PART, CURVED, AS VIEWED IN A DIRECTION PARALLEL TO THE ROTOR AXIS, SO THAT A CENTRAL REGION OF THE CURVED PART IS AT A GREATER RADIUS THAN TWO FLANKING REGIONS OF THE CURVED PART WHICH ARE RESPECTIVELY ADJACENT TO THE TWO BLADES; THE CURVES PART BEING CURVED TO A CATENARY CURVE HAVING ITS ENDS INCLINED AT AN ANGLE SATISFYING THE EQUATION
Claim 2
Dependent Claim
154 words
A TURBINE ROTOR COMPRISING AT LEAST ONE ROTOR DISC; A CIRCUMFERENTIAL ROW OF ROTOR BLADES ON THE DISC; SOCKET MEANS FORMED AT THE TIP OF EACH ROTOR BLADE; BRACING RING SECTIONS JOINING ADJACENT BLADES IN THE CIRCUMFERENTIAL ROW ADJACENT THE TIP OF SAID BLADE; EACH BRACING RING SECTION EXTENDING BETWEEN TWO ADJACENT BLADES IN THE ROW; EACH BRACING RING SECTION HAVING ENLARGED PORTIONS AT EACH END THEREOF, SAID PORTIONS BEING SECURED IN SAID SOCKET MEANS FOR ATTACHING SAID BRACING RING SECTION TO THE ROTOR BLADES; AND EACH BRACING RING SECTION INCLUDING A CURVED PART, CURVED, AS VIEWED IN A DIRECTION PARALLEL TO THE ROTOR AXIS, SO THAT A CENTRAL REGION OF THE CURVED PART IS AT A GREATER RADIUS THAN TWO FLANKING REGIONS OF THE CURVED PART WHICH ARE RESPECTIVELY ADJACENT TO THE TWO BLADES; THE CURVES PART BEING CURVED TO A CATENARY CURVE HAVING ITS ENDS INCLINED AT AN ANGLE SATISFYING THE EQUATION
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) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |