Patent US3380509A successfully refreshed from Google Patents.
US3380509A
Expired / Lapsed
US
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Method of pressure treatment of metallic melts, especially steel melts
Assignee: Krupp Stahl AG
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Filing: 1965-08-16
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Granted: 1968-04-30
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Expires: 1985-08-16
Abstract
No abstract record available.
Inventors
- 👤 Hentrich Robert
- 👤 Randak Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:02
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/0081; C21C7/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3022059A
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US2997384A
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US3212767A
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US2990592A
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US3179512A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |