US3073394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mounting jet reaction driven blades of helicopter propellers
Assignee: Dornier Werke GmbH
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Filing: 1961-09-15
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Granted: 1963-01-15
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Expires: 1981-09-15
Abstract
No abstract record available.
Inventors
- 👤 Laufer Theodor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:48
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/12; B64C27/16; B64C27/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
JET REACTION DRIVEN HELICOPTER ROTOR COMPRISING DIAMETRICALLY OPPOSED ROTOR BLADES, ROTATABLE HUB MEANS, OBLONG SPRING BANKS EXTENDING SUBSTANTIALLY RADIALLY FROM SAID HUB MEANS AND INTERCONNECTING SAID HUB MEANS AND SAID ROTOR BLADES, SAID SPRING BANKS BEING TORSIONALLY FLEXIBLE AND BEING ELASTICALLY BENDABLE TOWARD AND FROM THE ROTATION AXIS OF SAID HUB MEANS, AND PITCH-CONTROL MEANS FOR ADJUSTING THE BLADE ANGLE OF SAID ROTOR BLADES, SAID PITCH-CONTROL MEANS INCLUDING OBLONG RIGID INTERMEDIATE ELEMENTS PLACED SUBSTANTIALLY PARALLEL TO SAID SPRING BANKS, EACH OF SAID INTERMEDIATE ELEMENTS HAVING AN END MOVABLY CONNECTED TO SAID HUB MEANS AND A SECOND END MOVABLY CONNECTED TO ONE OF SAID BLADES FOR OSCILLATING MOVEMENT OF SAID INTERMEDIATE ELEMENTS SUBSTANTIALLY AROUND THE LONGITUDINAL SWING AXES OF SAID BLADES.
Claim 2
Dependent Claim
120 words
JET REACTION DRIVEN HELICOPTER ROTOR COMPRISING DIAMETRICALLY OPPOSED ROTOR BLADES, ROTATABLE HUB MEANS, OBLONG SPRING BANKS EXTENDING SUBSTANTIALLY RADIALLY FROM SAID HUB MEANS AND INTERCONNECTING SAID HUB MEANS AND SAID ROTOR BLADES, SAID SPRING BANKS BEING TORSIONALLY FLEXIBLE AND BEING ELASTICALLY BENDABLE TOWARD AND FROM THE ROTATION AXIS OF SAID HUB MEANS, AND PITCH-CONTROL MEANS FOR ADJUSTING THE BLADE ANGLE OF SAID ROTOR BLADES, SAID PITCH-CONTROL MEANS INCLUDING OBLONG RIGID INTERMEDIATE ELEMENTS PLACED SUBSTANTIALLY PARALLEL TO SAID SPRING BANKS, EACH OF SAID INTERMEDIATE ELEMENTS HAVING AN END MOVABLY CONNECTED TO SAID HUB MEANS AND A SECOND END MOVABLY CONNECTED TO ONE OF SAID BLADES FOR OSCILLATING MOVEMENT OF SAID INTERMEDIATE ELEMENTS SUBSTANTIALLY AROUND THE LONGITUDINAL SWING AXES OF SAID BLADES.
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) | 1966-01-14 | 1966-07-16 | 1967-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-14 | 1970-07-16 | 1971-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-14 | 1974-07-16 | 1975-01-15 | $7700.00 | Window Closed / Lapsed |