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Patent US2689989A successfully refreshed from Google Patents.
US2689989A
Expired / Lapsed
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Casting apparatus
Assignee: Anaconda Copper Mining Co
•
Filing: 1951-09-12
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Granted: 1954-09-28
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Expires: 1971-09-12
Abstract
No abstract record available.
Inventors
- 👤 William J Tretheway
- 👤 Rollin J Kennard
- 👤 Earl L Buker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:05
CPC Classifications
B; B22; B22D; B22D13/00; B22D13/06; B22D13/066
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2000155A
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US2172798A
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US2536692A
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US2557971A
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US2637079A
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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) | 1957-09-27 | 1958-03-29 | 1958-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-27 | 1962-03-29 | 1962-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-27 | 1966-03-29 | 1966-09-28 | $7700.00 | Window Closed / Lapsed |