US2531154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing stainless steel immune to intercrystalline corrosion
Assignee: Carnegie Illinois Steel Corp
•
Filing: 1945-11-06
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Granted: 1950-11-21
•
Expires: 1965-11-06
Abstract
No abstract record available.
Inventors
- 👤 Freeman J Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:13
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
THE METHOD OF PREVENTING INTERGRANULAR CORROSION IN AUSTENITIC STAINLESS STEELS CONTAINING AT LEAST 16.75% CHROMIUM COMPRISING THE STEPS OF ANALYZING THE STEEL FOR CHROMIUM CONTENT, ANALYZING THE STEEL FOR FREE CARBON CONTENT, AND TREATING THE STEEL TO PRODUCE A MAXIMUM GRAIN SIZE SUCH THAT:
Claim 2
Independent Claim
44 words
THE METHOD OF PREVENTING INTERGRANULAR CORROSION IN AUSTENITIC STAINLESS STEELS CONTAINING AT LEAST 16.75% CHROMIUM COMPRISING THE STEPS OF ANALYZING THE STEEL FOR CHROMIUM CONTENT, ANALYZING THE STEEL FOR FREE CARBON CONTENT, AND TREATING THE STEEL TO PRODUCE A MAXIMUM GRAIN SIZE SUCH THAT:
References Cited (Backward Citations)
US2073901A
Cited
US2374396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |