Patent US1378189A successfully refreshed from Google Patents.
US1378189A
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Method and apparatus for melting oxids, &c., without contamination
Assignee: Ajax Electrothermic Corp
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Filing: 1919-07-30
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Granted: 1921-05-17
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Expires: 1939-07-30
Abstract
No abstract record available.
Inventors
- 👤 Northrup Edwin Fitch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:01
CPC Classifications
F; F27; F27B; F27B14/00; F27B14/08; F27B14/10; C; C01; C01B; C01B33/00; C01B33/02; F27B3/00; F27B3/08; F27D; F27D11/00; F27D11/06; H; H01; H01F; H01F5/00; H01F5/06; H05; H05B; H05B6/00; H05B6/02; H05B6/16; H05B6/18; H05B6/22; H05B6/24; Y; Y10; Y10S; Y10S164/00; Y10S164/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1924-05-16 | 1924-11-15 | 1925-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-05-16 | 1928-11-15 | 1929-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-05-16 | 1932-11-15 | 1933-05-17 | $7700.00 | Window Closed / Lapsed |