Patent US1463720A successfully refreshed from Google Patents.
US2531964A
Expired / Lapsed
US
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Electric metallurgical apparatus
Assignee: Anglo American Corp of South Africa Pty Ltd
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Filing: 1949-02-28
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Granted: 1950-11-28
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Expires: 1969-02-28
Abstract
No abstract record available.
Inventors
- 👤 David R Bean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:30
CPC Classifications
C; C22; C22B; C22B5/00; C22B5/02; C22B5/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1515967A
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US800857A
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US938752A
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US1218151A
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US1818812A
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US2122241A
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US2227069A
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US2365346A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-27 | 1954-05-29 | 1954-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-27 | 1958-05-29 | 1958-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-27 | 1962-05-29 | 1962-11-28 | $7700.00 | Window Closed / Lapsed |