Patent US3519224A successfully refreshed from Google Patents.
US3519224A
Expired / Lapsed
US
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Vertical takeoff and landing aircraft
Assignee: TURBO CIRCLE WING Inc
•
Filing: 1966-03-18
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Granted: 1970-07-07
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Expires: 1986-03-18
Abstract
No abstract record available.
Inventors
- 👤 Edward S Boyd
- 👤 Mason Mallory
- 👤 Loren R Skinner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:41
CPC Classifications
B; B64; B64C; B64C29/00; B64C29/0008; B64C29/0041; B64C29/0066; B64C39/00; B64C39/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA678700A
Cited
US2777649A
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GB828884A
Cited
US2940689A
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US2863621A
Cited
US3173520A
Cited
US2978206A
Cited
US3051415A
Cited
FR1347733A
Cited
US3182929A
Cited
US3312425A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-06 | 1974-01-05 | 1974-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-06 | 1978-01-05 | 1978-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-06 | 1982-01-05 | 1982-07-07 | $7700.00 | Window Closed / Lapsed |