US2550502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for purifying metals
Assignee: General Electric Co
•
Filing: 1948-01-30
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Granted: 1951-04-24
•
Expires: 1968-01-30
Abstract
No abstract record available.
Inventors
- 👤 George H Sittner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:31
CPC Classifications
C; C22; C22B; C22B13/00; C22B13/06; F; F27; F27B; F27B14/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US566921A
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US1101548A
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US1301544A
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US2025768A
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US2099593A
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US2241806A
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US2335569A
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US2404364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-23 | 1954-10-23 | 1955-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-23 | 1958-10-23 | 1959-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-23 | 1962-10-23 | 1963-04-24 | $7700.00 | Window Closed / Lapsed |