Patent US3586778A successfully refreshed from Google Patents.
Patent US1837685A successfully refreshed from Google Patents.
US1837685A
Expired / Lapsed
US
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Blast furnace charging equipment
Assignee: Otis Elevator Co
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Filing: 1931-02-27
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Granted: 1931-12-22
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Expires: 1951-02-27
Abstract
No abstract record available.
Inventors
- 👤 Frank I Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:37
CPC Classifications
C; C21; C21B; C21B7/00; C21B7/18; F; F27; F27D; F27D3/00; F27D3/10; F27D2003/105
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1934-12-21 | 1935-06-22 | 1935-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-12-21 | 1939-06-22 | 1939-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-12-21 | 1943-06-22 | 1943-12-22 | $7700.00 | Window Closed / Lapsed |