US2579402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic hopper discharge apparatus
Assignee: Allen Sherman Hoff Co
•
Filing: 1948-11-20
•
Granted: 1951-12-18
•
Expires: 1968-11-20
Abstract
No abstract record available.
Inventors
- 👤 Philip B Silk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:07
CPC Classifications
F; F23; F23J; F23J1/00; F23J2700/00; F23J2700/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1179202A
Cited
US1819486A
Cited
DE512547C
Cited
US1905223A
Cited
US2159557A
Cited
US2280944A
Cited
US2379998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-17 | 1955-06-18 | 1955-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-17 | 1959-06-18 | 1959-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-17 | 1963-06-18 | 1963-12-18 | $7700.00 | Window Closed / Lapsed |