US3463398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Material spreader device for helicopters
Assignee: Evergreen Helicopters Inc
•
Filing: 1968-11-21
•
Granted: 1969-08-26
•
Expires: 1988-11-21
Abstract
No abstract record available.
Inventors
- 👤 Delford M Smith
- 👤 Ward Eason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:16
CPC Classifications
A; A01; A01C; A01C17/00; A01C17/001; A01C17/005; B; B64; B64D; B64D1/00; B64D1/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3127133A
Cited
US2659556A
Cited
US2898008A
Cited
US3167319A
Cited
US3142490A
Cited
GB1091674A
Cited
US3191944A
Cited
US3341125A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-25 | 1973-02-24 | 1973-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-25 | 1977-02-24 | 1977-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-25 | 1981-02-24 | 1981-08-26 | $7700.00 | Window Closed / Lapsed |