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US670592A
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US
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Apparatus for increasing the cross-sectional area of metal rails or analogous articles.
Assignee: MERRILL PROCESS STEEL Co
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Filing: 1900-08-03
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Granted: 1901-03-26
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Expires: 1920-08-03
Abstract
No abstract record available.
Inventors
- 👤 George Spencer Merrill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:48
CPC Classifications
B; B21; B21D; B21D13/00; B21D13/04; Y; Y10; Y10T; Y10T29/00; Y10T29/51; Y10T29/5116
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 |