US2991205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of improving corrosion resistance of stainless steel
Assignee: Allegheny Ludlum Steel Corp
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Filing: 1957-12-13
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Granted: 1961-07-04
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Expires: 1977-12-13
Abstract
No abstract record available.
Inventors
- 👤 Rush A Lincoln
- 👤 William G Renshaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:55
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/24; C23C22/30
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
47 words
A METHOD FOR IMPROVING THE CORROSION RESISTANCE OF CHROMIUM TYPE STAINLESS STEEL ALLOYS WHICH COMPRISES APPLYING TO THE SURFACE OF SAID ALLOYS AN IN SITU FORMED COATING OF HYDRATED MIXED CHROMIUM OXIDES AND THEN BUFFING DOWN THE COATING UNTIL ITS PRESENCE IS NOT APPARENT TO THE EYE.
References Cited (Backward Citations)
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US2106227A
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US2788292A
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US2768103A
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US2777785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |