Patent DE167181C successfully refreshed from Google Patents.
US2579409A
Expired / Lapsed
US
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Furnace charger
Assignee: PITTSBURGH METALLURG Co I
•
Filing: 1946-04-25
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Granted: 1951-12-18
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Expires: 1966-04-25
Abstract
No abstract record available.
Inventors
- 👤 White Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:47
CPC Classifications
F; F27; F27D; F27D3/00; F27D3/06; F27D3/12; F27D2003/125; F27D3/0025; F27D3/0031
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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 |