Patent US4060002A successfully refreshed from Google Patents.
US2907084A
Expired / Lapsed
US
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Hollow cores for making castings
Assignee: Alcoa Corp
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Filing: 1956-03-27
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Granted: 1959-10-06
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Expires: 1976-03-27
Abstract
No abstract record available.
Inventors
- 👤 Robert T Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:19
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/10; B22C9/106; B22C9/101
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1864451A
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US1801346A
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US2304879A
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US2491761A
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US2577205A
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US2602766A
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US2824348A
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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) | 1962-10-05 | 1963-04-06 | 1963-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-05 | 1967-04-06 | 1967-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-05 | 1971-04-06 | 1971-10-06 | $7700.00 | Window Closed / Lapsed |