Patent US670591A successfully refreshed from Google Patents.
US670591A
Expired / Lapsed
US
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Art of increasing the cross-sectional area of metal rails or analogous articles.
Assignee: MERRILL PROCESS STEEL Co
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Filing: 1898-11-04
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Granted: 1901-03-26
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Expires: 1918-11-04
Abstract
No abstract record available.
Inventors
- 👤 George Spencer Merrill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:19
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/06; B; B21; B21J; B21J5/00
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) | 1904-03-25 | 1904-09-24 | 1905-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1908-03-25 | 1908-09-24 | 1909-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1912-03-25 | 1912-09-24 | 1913-03-26 | $7700.00 | Window Closed / Lapsed |