US3020323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for stirring electric-currentconducting melts in furnaces, mixers and holders
Assignee: Individual
•
Filing: 1958-11-18
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Granted: 1962-02-06
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Expires: 1978-11-18
Abstract
No abstract record available.
Inventors
- 👤 William D Redfern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:19
CPC Classifications
F; F27; F27D; F27D27/00; H; H05; H05B; H05B6/00; H05B6/02; H05B6/34; F27B; F27B3/00; F27B3/08; F27B3/085; H05B2213/00; H05B2213/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-05 | 1965-08-07 | 1966-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-05 | 1969-08-07 | 1970-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-05 | 1973-08-07 | 1974-02-06 | $7700.00 | Window Closed / Lapsed |