US2920846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter landing mat
Assignee: AVERY C HAND JR
•
Filing: 1955-09-07
•
Granted: 1960-01-12
•
Expires: 1975-09-07
Abstract
No abstract record available.
Inventors
- 👤 Fred E Lingafelter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:40
CPC Classifications
E; E01; E01F; E01F3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR648853A
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FR906488A
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CH247916A
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GB742240A
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GB741920A
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |