US3598573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Desulfurization agent and process
Assignee: Evonik Operations GmbH
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Filing: 1969-04-28
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Granted: 1971-08-10
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Expires: 1989-04-28
Abstract
Abstract A MIXTURE OF CALCIUM CARBIDE AND PRECIPITATED, CARBONCONTAINING CALCIUM CARBONATE IS MOST EFFECTIVE IN DESULFURIZING FERROUS MELTS.
Inventors
- 👤 Alfred Freissmuth
- 👤 Walter Heinl
- 👤 Herbert Knahl
- 👤 Erich Pfluger
- 👤 Jan Schokkenbroek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:38
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/02; C21C1/025
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |