US2927746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toroidal aircraft
Assignee: Individual
•
Filing: 1956-05-29
•
Granted: 1960-03-08
•
Expires: 1976-05-29
Abstract
No abstract record available.
Inventors
- 👤 Mellen Walter Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:22
CPC Classifications
B; B64; B64C; B64C39/00; B64C39/06; B64C39/062; B64C39/064
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1776994A
Cited
US1931753A
Cited
US2480040A
Cited
US2494368A
Cited
US2563047A
Cited
US2547266A
Cited
US2718364A
Cited
US2726829A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-08 | 1963-09-07 | 1964-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-08 | 1967-09-07 | 1968-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-08 | 1971-09-07 | 1972-03-08 | $7700.00 | Window Closed / Lapsed |