US2818461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arc-melting furnace for high-melting metals
Assignee: WC Heraus GmbH and Co KG
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Filing: 1955-02-16
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Granted: 1957-12-31
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Expires: 1975-02-16
Abstract
No abstract record available.
Inventors
- 👤 Gruber Helmut
- 👤 Pieper Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:12
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/52; F; F27; F27D; F27D11/00; F27D11/08; H; H05; H05B; H05B7/00; H05B7/18; Y; Y02; Y02P; Y02P10/00; Y02P10/20
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) | 1960-12-30 | 1961-07-01 | 1961-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-30 | 1965-07-01 | 1965-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-30 | 1969-07-01 | 1969-12-31 | $7700.00 | Window Closed / Lapsed |