Patent US2460896A successfully refreshed from Google Patents.
US2460896A
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Composition for blackening copper and copper alloy surfaces
Assignee: MacDermid Enthone Inc
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Filing: 1944-08-19
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Granted: 1949-02-08
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Expires: 1964-08-19
Abstract
No abstract record available.
Inventors
- 👤 Walter R Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:42
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/60; C23C22/63
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR330699A
Cited
US1339783A
Cited
US1811699A
Cited
US2145062A
Cited
US1961576A
Cited
US2364993A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-02-08 | 1952-08-09 | 1953-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-02-08 | 1956-08-09 | 1957-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-02-08 | 1960-08-09 | 1961-02-08 | $7700.00 | Window Closed / Lapsed |