US2916536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum arc furnace
Assignee: WC Heraus GmbH and Co KG
•
Filing: 1958-01-13
•
Granted: 1959-12-08
•
Expires: 1978-01-13
Abstract
No abstract record available.
Inventors
- 👤 Gruber Helmut
- 👤 Scheidig Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:34
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/18; F; F27; F27D; F27D11/00; F27D11/08; H05K; H05K7/00; H05K7/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2686822A
Cited
US2697126A
Cited
US2818461A
Cited
US2726278A
Cited
US2727936A
Cited
US2759034A
Cited
US2845293A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-07 | 1963-06-08 | 1963-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-07 | 1967-06-08 | 1967-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-07 | 1971-06-08 | 1971-12-08 | $7700.00 | Window Closed / Lapsed |