Patent US2620310A successfully refreshed from Google Patents.
US2620310A
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Hardening bath
Assignee: Evonik Operations GmbH
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Filing: 1950-10-02
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Granted: 1952-12-02
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Expires: 1970-10-02
Abstract
No abstract record available.
Inventors
- 👤 Albrecht Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:33
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/34; C21D1/44; C21D1/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A SALT BATH FOR THE HEAT TREATMENT OF STEEL COMPRISING 50% TO 99% BY WEIGHT OF AT LEAST ONE CHLORIDE SELECTED FROM THE GROUP CONSISTING OF ALKALI AND ALKALINE EARTH METAL CHLORIDES AND 1% TO 50% BY WEIGHT OF MAGNESIUM FLUORIDE.
Claim 2
Dependent Claim
41 words
A SALT BATH FOR THE HEAT TREATMENT OF STEEL COMPRISING 50% TO 99% BY WEIGHT OF AT LEAST ONE CHLORIDE SELECTED FROM THE GROUP CONSISTING OF ALKALI AND ALKALINE EARTH METAL CHLORIDES AND 1% TO 50% BY WEIGHT OF MAGNESIUM FLUORIDE.
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) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |