Patent US3289770A successfully refreshed from Google Patents.
US3289770A
Expired / Lapsed
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Helicopter rotor system
Assignee: Bolkow GmbH
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Filing: 1964-08-03
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Granted: 1966-12-06
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Expires: 1984-08-03
Abstract
No abstract record available.
Inventors
- 👤 Derschmidt Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:59
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/54; B64C27/001; B64C27/32; B64C27/37; B64C27/39; B64C2027/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A HELICOPTER ROTOR CONSTRUCTION COMPRISING A ROTOR ROTATABLE ABOUT AN AXIS WHICH IS SUBSTANTIALLY VERTICAL, A PLURALITY OF ROTOR BLADES PIVOTALLY MOUNTED ON SAID ROTOR AT A SPACED LOCATION FROM THE AXIS OF ROTATION THEREOF AND EACH BEING PIVOTAL FOR MOVEMENT IN LEAD-LAG DIRECTIONS ABOUT AN AXIS SUBSTANTIALLY PARALLEL TO THE AXIS OF ROTATION OF SAID ROTOR DURING THE ROTATION OF SAID ROTOR, AND MASS IMBALANCE PRODUCING MANS OPERATIVELY ASSOCIATED WITH SAID ROTOR BY A TRANSMISSION MEANS, THE TRANSMISSION ROTIO OF WHICH EFFECTS A MASS ROTATIONAL SPEED OF A MULTIPLE OF THE ROTOR SPEED IN THE DIRECTION OF ROTATION OF THE ROTOR, SAID MULTIPLE CORRESPONDS TO THE NUMBER OF ROTOR BLADES, FOR INFLUENCING THE PIVOTAL LEAD-LAG MOVEMENT OF SAID ROTOR BLADES DURING ROTATION OF SAID ROTOR.
Claim 2
Dependent Claim
126 words
A HELICOPTER ROTOR CONSTRUCTION COMPRISING A ROTOR ROTATABLE ABOUT AN AXIS WHICH IS SUBSTANTIALLY VERTICAL, A PLURALITY OF ROTOR BLADES PIVOTALLY MOUNTED ON SAID ROTOR AT A SPACED LOCATION FROM THE AXIS OF ROTATION THEREOF AND EACH BEING PIVOTAL FOR MOVEMENT IN LEAD-LAG DIRECTIONS ABOUT AN AXIS SUBSTANTIALLY PARALLEL TO THE AXIS OF ROTATION OF SAID ROTOR DURING THE ROTATION OF SAID ROTOR, AND MASS IMBALANCE PRODUCING MANS OPERATIVELY ASSOCIATED WITH SAID ROTOR BY A TRANSMISSION MEANS, THE TRANSMISSION ROTIO OF WHICH EFFECTS A MASS ROTATIONAL SPEED OF A MULTIPLE OF THE ROTOR SPEED IN THE DIRECTION OF ROTATION OF THE ROTOR, SAID MULTIPLE CORRESPONDS TO THE NUMBER OF ROTOR BLADES, FOR INFLUENCING THE PIVOTAL LEAD-LAG MOVEMENT OF SAID ROTOR BLADES DURING ROTATION OF SAID ROTOR.
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) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |