US3854937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pitting corrosion resistant austenite stainless steel
Assignee: Nippon Steel Corp
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Filing: 1971-12-13
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Granted: 1974-12-17
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Expires: 1991-12-13
Abstract
Abstract A pitting corrosion resistant austenite stainless steel comprising not more than 0.08 percent by weight of carbon, not more than 4 percent by weight of silicon, not more than 5.0 percent by weight of manganese, not more than 0.04 percent by weight of phosphorus, not more than 0.03 percent by weight of sulfur, 10 to 18 percent by weight of nickel, 23 to 30 percent by weight of chromium and 0.30 to 0.45 percent by weight of nitrogen, the balance being iron and unavoidable impurities, and satisfying the condition of Ni % + 30 (C % + N %) > OR = 20 percent.
Inventors
- 👤 T Muta
- 👤 H Abo
- 👤 S Noguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:13
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/001; C22C38/18; C22C38/40; C22C38/44; C22C38/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A PITTING CORROSION RESISTANT AUSTENITE STAINLESS STEEL CONSISTING ESSENTIALLY OF 0.08 PERCENT BY WEIGHT OF CARBON, SILICON IN AN AMOUNT NOT EXCEEDING 4.0 PERCENT BY WEIGHT, MANGANESE IN AN AMOUNT NOT EXCEEDING 5.0 PERCENT BY WEIGHT, PHOSPHORUS IN AN AMOUN NOT EXCEEDING 0.04 PERCENT BY WEIGHT, SULFUR IN AN AMOUNT NOT EXCEEDING 0.03 PERCENT BY WEIGHT, 10 TO 18 PERCENT BY WEIGHT OF NICKEL, 23 TO 30 PERCENT BY WEIGHT OF CHROMIUM, 0.30 TO 0.45 PERCENT BY WEIGHT OF NIROGEN, AND 0.1 TO 4.0 PERCENT BY WEIGHT OF MOLYBDENUM, THE BALANCE BEING IRON AND UNAVOIDABLE IMPURITES, SAID STEEL SATISFYING THE CONDITION OF NI % + 30 (C % + N %) 20%.
Claim 2
Dependent Claim
112 words
A PITTING CORROSION RESISTANT AUSTENITE STAINLESS STEEL CONSISTING ESSENTIALLY OF 0.08 PERCENT BY WEIGHT OF CARBON, SILICON IN AN AMOUNT NOT EXCEEDING 4.0 PERCENT BY WEIGHT, MANGANESE IN AN AMOUNT NOT EXCEEDING 5.0 PERCENT BY WEIGHT, PHOSPHORUS IN AN AMOUN NOT EXCEEDING 0.04 PERCENT BY WEIGHT, SULFUR IN AN AMOUNT NOT EXCEEDING 0.03 PERCENT BY WEIGHT, 10 TO 18 PERCENT BY WEIGHT OF NICKEL, 23 TO 30 PERCENT BY WEIGHT OF CHROMIUM, 0.30 TO 0.45 PERCENT BY WEIGHT OF NIROGEN, AND 0.1 TO 4.0 PERCENT BY WEIGHT OF MOLYBDENUM, THE BALANCE BEING IRON AND UNAVOIDABLE IMPURITES, SAID STEEL SATISFYING THE CONDITION OF NI % + 30 (C % + N %) 20%.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |