US3925064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High corrosion fatigue strength stainless steel
Assignee: Kobe Steel Ltd
•
Filing: 1973-05-31
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Granted: 1975-12-09
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Expires: 1993-05-31
Abstract
Abstract A high corrosion fatigue strength stainless steel is formed by combining less than 0.07 wt% carbon, less than 0.05 wt% nitrogen, from 0.1 to 2 wt% silicon, from 0.1 to 4 wt% manganese, from 10 to 15 wt% chromium, from 2 to 7 wt% nickel, from 0.1 to 3 wt% molybdenum, and a total of from 0.01 to 1 wt% of at least one element from the group of titanium, niobium and tantalum with the balance being iron, impurities and other incidental constituents.
Inventors
- 👤 Akira Takamura
- 👤 Kazutoshi Shimogori
- 👤 Toshiaki Yamagata
- 👤 Masao Sato
- 👤 Koziro Kitanata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:01
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A HIGH CORROSION FATIGUE STRENGTH STAINLESS STEEL WHICH CONSISTS ESSENTIALLY OF LESS THAN 0.05 WT% CARBON, LESS THAN 0.03 WT% NITROGEN, FROM 0.1 TO 2 WT% SILICON, FROM 0.1 TO 4 WT% MANGANESE, FROM 12 TO 14 WT% CHROMIUM, FROM 4 TO 6 WT% NICKEL, FROM 0.1 TO 3 WT% MOLYBDENUM AND A TOTAL OF FROM 0.01 TO 1 WT% OF AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF TITANIUM, NIOBIUM AND TANTALUM WITH THE BALANCE BEING ESSENTIALLY IRON SUCH THAT SAID STEEL HAS FROM 10 - 45% RETAINED AUSTENITE.
Claim 2
Dependent Claim
92 words
A HIGH CORROSION FATIGUE STRENGTH STAINLESS STEEL WHICH CONSISTS ESSENTIALLY OF LESS THAN 0.05 WT% CARBON, LESS THAN 0.03 WT% NITROGEN, FROM 0.1 TO 2 WT% SILICON, FROM 0.1 TO 4 WT% MANGANESE, FROM 12 TO 14 WT% CHROMIUM, FROM 4 TO 6 WT% NICKEL, FROM 0.1 TO 3 WT% MOLYBDENUM AND A TOTAL OF FROM 0.01 TO 1 WT% OF AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF TITANIUM, NIOBIUM AND TANTALUM WITH THE BALANCE BEING ESSENTIALLY IRON SUCH THAT SAID STEEL HAS FROM 10 - 45% RETAINED AUSTENITE.
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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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |