Patent US2711981A successfully refreshed from Google Patents.
US2711981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Salt bath for heat treating steel
Assignee: Imperial Chemical Industries Ltd
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Filing: 1952-11-24
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Granted: 1955-06-28
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Expires: 1972-11-24
Abstract
No abstract record available.
Inventors
- 👤 Waterfall Frederick David
- 👤 Hewson Robert Leslie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:11
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/40; C23C8/42; C23C8/44; C23C8/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A PROCESS FOR THE HEAT TREATMENT OF A MEMBER OF THE GROUP CONSISTING OF STEEL ALLOY WHICH COMPRISES HEATING THE SAID MEMBER OF THE GROUP IN A BATH OBTAINED BY FUSING A MIXTURE CONTAINING A PREDOMINATE AMOUNT OF AT LEAST ONE ALKALI METAL HALIDE, A LESSER QUANTITY OF ALKALI METAL CYANIDE, AND FROM 0.25% TO 5% BY WEIGHT OF THE SILICON.
Claim 2
Dependent Claim
61 words
A PROCESS FOR THE HEAT TREATMENT OF A MEMBER OF THE GROUP CONSISTING OF STEEL ALLOY WHICH COMPRISES HEATING THE SAID MEMBER OF THE GROUP IN A BATH OBTAINED BY FUSING A MIXTURE CONTAINING A PREDOMINATE AMOUNT OF AT LEAST ONE ALKALI METAL HALIDE, A LESSER QUANTITY OF ALKALI METAL CYANIDE, AND FROM 0.25% TO 5% BY WEIGHT OF THE SILICON.
References Cited (Backward Citations)
US2063079A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-06-27 | 1958-12-27 | 1959-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-06-27 | 1962-12-27 | 1963-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-06-27 | 1966-12-27 | 1967-06-28 | $7700.00 | Window Closed / Lapsed |