US3518025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter rotor system
Assignee: Lockheed Martin Corp
•
Filing: 1968-05-06
•
Granted: 1970-06-30
•
Expires: 1988-05-06
Abstract
No abstract record available.
Inventors
- 👤 Jacob Schmidt
- 👤 Lee Baumstein
- 👤 Arthur M James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:17
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/327; B64C27/33
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191500622A
Cited
US2137952A
Cited
US2995192A
Cited
US3330362A
Cited
US3434546A
Cited
US3434372A
Cited
US3415324A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-29 | 1973-12-29 | 1974-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-29 | 1977-12-29 | 1978-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-29 | 1981-12-29 | 1982-06-30 | $7700.00 | Window Closed / Lapsed |