US2680447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unloading device
Assignee: —
•
Filing: —
•
Granted: 1954-06-08
•
Expires: 1971-06-08
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:19
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/22; F04B49/24; F16; F16K; F16K3/00; F16K3/02; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2622; Y10T137/7722; Y10T137/7738
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US404684A
Cited
US1949930A
Cited
US2277656A
Cited
US2212997A
Cited
US2351512A
Cited
US2434799A
Cited
US2411930A
Cited
US2429489A
Cited
US2375411A
Cited
US2568026A
Cited
US2416881A
Cited
US2639722A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-07 | 1957-12-07 | 1958-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-07 | 1961-12-07 | 1962-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-07 | 1965-12-07 | 1966-06-08 | $7700.00 | Window Closed / Lapsed |