US2447979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper base alloy for metal evaporation
Assignee: Duracell Inc USA
•
Filing: 1944-07-06
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Granted: 1948-08-24
•
Expires: 1964-07-06
Abstract
No abstract record available.
Inventors
- 👤 Franz R Hensel
- 👤 Earl I Larsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:29
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/24; C23C14/26; C23C14/06; C23C14/14; Y; Y10; Y10S; Y10S29/00; Y10S29/044
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1923955A
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US2413606A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-24 | 1952-02-23 | 1952-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-24 | 1956-02-23 | 1956-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-24 | 1960-02-23 | 1960-08-24 | $7700.00 | Window Closed / Lapsed |