Patent US1444768A successfully refreshed from Google Patents.
Patent US2452855A successfully refreshed from Google Patents.
US2452855A
Expired / Lapsed
US
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Mold for making castings
Assignee: Alcoa Corp
•
Filing: 1943-01-06
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Granted: 1948-11-02
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Expires: 1963-01-06
Abstract
No abstract record available.
Inventors
- 👤 Louis W Kempf
- 👤 La Verne W Eastwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:04
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/22; B22C9/24; B22C9/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US246694A
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US345455A
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US404889A
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US486327A
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US1011430A
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US1645726A
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US2101044A
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US2253903A
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US2314342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-02 | 1952-05-03 | 1952-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-02 | 1956-05-03 | 1956-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-02 | 1960-05-03 | 1960-11-02 | $7700.00 | Window Closed / Lapsed |