US3467197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor blade
Assignee: Bell Aerospace Corp
•
Filing: 1968-05-07
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Granted: 1969-09-16
•
Expires: 1988-05-07
Abstract
No abstract record available.
Inventors
- 👤 Richard F Spivey
- 👤 Jan M Drees
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:34
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/46; B64C27/463
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1692081A
Cited
US1888056A
Cited
US2070657A
Cited
US2152861A
Cited
US2422388A
Cited
US3066742A
Cited
US3053325A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-15 | 1973-03-17 | 1973-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-15 | 1977-03-17 | 1977-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-15 | 1981-03-17 | 1981-09-16 | $7700.00 | Window Closed / Lapsed |