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US3436036A
Expired / Lapsed
US
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Takeoff and landing platform for vertical takeoff and landing planes
Assignee: Entwicklungsring Sued GmbH
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Filing: 1966-10-13
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Granted: 1969-04-01
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Expires: 1986-10-13
Abstract
No abstract record available.
Inventors
- 👤 Gero Otto Madelung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:19
CPC Classifications
E; E01; E01C; E01C9/00; E01C9/008; B; B64; B64F; B64F1/00
Claims Analysis
Total Claims: 0
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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) | 1972-03-31 | 1972-09-30 | 1973-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-31 | 1976-09-30 | 1977-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-31 | 1980-09-30 | 1981-04-01 | $7700.00 | Window Closed / Lapsed |