Patent US1266928A successfully refreshed from Google Patents.
US1266928A
Expired / Lapsed
US
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Open-hearth steel process.
Assignee: Youngstown Sheet and Tube Co
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Filing: 1917-07-20
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Granted: 1918-05-21
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Expires: 1937-07-20
Abstract
No abstract record available.
Inventors
- 👤 Charles H Elliott
- 👤 Elmer T Mccleary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:43
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/30
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) | 1921-05-20 | 1921-11-19 | 1922-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1925-05-20 | 1925-11-19 | 1926-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1929-05-20 | 1929-11-19 | 1930-05-21 | $7700.00 | Window Closed / Lapsed |