Patent US2579885A successfully refreshed from Google Patents.
US2579885A
Expired / Lapsed
US
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Pouring arc furnace
Assignee: Saint Gobain Abrasives Inc
•
Filing: 1948-12-04
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Granted: 1951-12-25
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Expires: 1968-12-04
Abstract
No abstract record available.
Inventors
- 👤 John A Upper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:28
CPC Classifications
F; F27; F27D; F27D11/00; F27D11/08; C; C01; C01F; C01F7/00; C01F7/02
Claims Analysis
Total Claims: 0
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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) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |