US3813240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion-resisting steel
Assignee: Mitsubishi Steel Mfg Co Ltd
•
Filing: 1972-06-21
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Granted: 1974-05-28
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Expires: 1992-06-21
Abstract
Abstract THE CORROSION-RESISTING STEEL WITH SUPERB RESISTANCE TO PITTING CORROSION IS MANUFACTURED OF A MICROSTRUCTURAL STAINLESS STEEL COMPOSED MAINLY OF CHROMIUM OR CHROMIUM ADDED WITH AT LEAST ONE OF NICKEL AND MANGANESE STILL CONTAINING 10 TO 30 PERCENT BY WEIGHT OF CHRONIUM AND FURTHUR HAVING 2 TO 10 PERCENT BY WEIGHT OF ONE OR MORE CARBOONITRIDES SELECTED FROM THE GROUP OF TITANIUM, ZIRCONIUM, NIOBIUM, TANTALUM AND VANADIUUM UNIFORMLY AND FINELY DISPERSED THEREIN.
Inventors
- 👤 Y Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:35
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0292
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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |