US3426982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vertiplane vtol aircraft
Assignee: RONALD L MARKWOOD
•
Filing: 1967-02-03
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Granted: 1969-02-11
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Expires: 1987-02-03
Abstract
No abstract record available.
Inventors
- 👤 Ronald L Markwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:07
CPC Classifications
B; B64; B64C; B64C29/00; B64C29/0008; B64C29/0016; B64C29/0025; B64C27/00; B64C27/22; B64C27/28; B64C27/82; B64C39/00; B64C39/02; B64C39/026; B64C2027/8227; B64C2027/8236
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) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |