US3507461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary wing aircraft
Assignee: VLM CORP
•
Filing: 1967-06-16
•
Granted: 1970-04-21
•
Expires: 1987-06-16
Abstract
No abstract record available.
Inventors
- 👤 William N Rosta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:45
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/08; B64C39/00; B64C39/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1868292A
Cited
GB760571A
Cited
US2953320A
Cited
US3007372A
Cited
FR1245769A
Cited
US3082977A
Cited
US3135481A
Cited
US3215370A
Cited
US3182929A
Cited
US3321156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-20 | 1973-10-20 | 1974-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-20 | 1977-10-20 | 1978-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-20 | 1981-10-20 | 1982-04-21 | $7700.00 | Window Closed / Lapsed |