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US5897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in the manufacture of alkaline chromates
Assignee: —
•
Filing: —
•
Granted: 1848-10-31
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Expires: 1865-10-31
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:15
CPC Classifications
C; C01; C01G; C01G37/00; C01G37/14
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) | 1851-10-31 | 1852-05-01 | 1852-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1855-10-31 | 1856-05-01 | 1856-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1859-10-31 | 1860-05-01 | 1860-10-31 | $7700.00 | Window Closed / Lapsed |