Patent US132974A successfully refreshed from Google Patents.
US132974A
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US
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Improvement in apparatus for charging blast-furnaces
Assignee: —
•
Filing: —
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Granted: 1872-11-12
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Expires: 1889-11-12
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:43
CPC Classifications
C; C21; C21B; C21B7/00; C21B7/18; C21B7/20; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19642; Y10T74/1967
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) | 1875-11-12 | 1876-05-13 | 1876-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1879-11-12 | 1880-05-13 | 1880-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1883-11-12 | 1884-05-13 | 1884-11-12 | $7700.00 | Window Closed / Lapsed |