US3509800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable ground cover for starting and landing surfaces for vertically and short-starting and landing vehicles
Assignee: Vereinigte Flugtechnische Werke Fokker GmbH
•
Filing: 1967-12-04
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Granted: 1970-05-05
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Expires: 1987-12-04
Abstract
No abstract record available.
Inventors
- 👤 Rolf Kirkamp
- 👤 Hartmut Klein
- 👤 Hans Peter Rossner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:43
CPC Classifications
E; E01; E01C; E01C9/00; E01C9/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US422318A
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US514313A
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US2736248A
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US973815A
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US2266178A
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FR855056A
Cited
US2344131A
Cited
US2353398A
Cited
GB692966A
Cited
US2934934A
Cited
US3256785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-04 | 1973-11-03 | 1974-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-04 | 1977-11-03 | 1978-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-04 | 1981-11-03 | 1982-05-05 | $7700.00 | Window Closed / Lapsed |