US2687817A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for controlling the flow of solid materials
Assignee: CHESAPEAKE AND OHIO RAILWAY Co
•
Filing: 1952-02-01
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Granted: 1954-08-31
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Expires: 1972-02-01
Abstract
No abstract record available.
Inventors
- 👤 Kenneth A Browne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:16
CPC Classifications
B; B65; B65G; B65G69/00; B65G69/16; B65G2814/00; B65G2814/02; B65G2814/0205
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2111663A
Cited
US2277879A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |