US2918183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cushion cargo handling system
Assignee: Douglas Aircraft Co Inc
•
Filing: 1958-06-11
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Granted: 1959-12-22
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Expires: 1978-06-11
Abstract
No abstract record available.
Inventors
- 👤 Thorvald K Petersen
- 👤 Paul L Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:55
CPC Classifications
B; B65; B65G; B65G51/00; B65G51/02; B65G51/03
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) | 1962-12-21 | 1963-06-22 | 1963-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-21 | 1967-06-22 | 1967-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-21 | 1971-06-22 | 1971-12-22 | $7700.00 | Window Closed / Lapsed |