US3083934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary wing aircraft
Assignee: Individual
•
Filing: 1961-10-12
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Granted: 1963-04-02
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Expires: 1981-10-12
Abstract
No abstract record available.
Inventors
- 👤 Edward G Vanderlip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:06
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/20; B64B; B64B2201/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
78 words
A ROTARY WING AIRCRAFT COMPRISING IN COMBINATION; ROTOR MEANS ADAPTED TO BE CONNECTED TO POWER MEANS FOR DRIVING SAID ROTOR MEANS; ANNULAR SHROUD MEANS HAVING ITS INNER WALL DISPOSED IN CLOSE PROXIMITY AROUND THE OUTSIDE OF THE ROTOR BLADE TIP PATH OF SAID ROTOR MEANS BUT NOT TOUCHING SAID PATH; AND INFLATABLE MEANS SECURED EXCLUSIVELY TO THE OUTSIDE WALL OF SAID ANNULAR SHROUD, SAID INFLATABLE MEANS BEING FILLED WITH LIGHTER-THAN-AIR GAS TO PROVIDE LIGHTER-THAN-AIR CHARACTERISTICS FOR SAID AIRCRAFT.
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) | 1966-04-01 | 1966-10-01 | 1967-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-01 | 1970-10-01 | 1971-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-01 | 1974-10-01 | 1975-04-02 | $7700.00 | Window Closed / Lapsed |