US3684589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a minimum-ridging type 430 stainless steel
Assignee: United States Steel Corp
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Filing: 1970-10-02
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Granted: 1972-08-15
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Expires: 1990-10-02
Abstract
Abstract A PROCESS FOR PRODUCING A TYPE 430 STAINLESS STEEL SHEET PRODUCT WITH SUBSTANTIALLY REDUCED RIDGING CHARACTERISTICS WHEN DRAWN. COMMENCING IN SLAB FORM, THE TYPE 430 STEEL IS HOT ROLLED AT 1850 TO 1950* F. TO A THICKNESS OF 0.1 TO 0.25 INCH; BOX ANNEALED AT 1750 TO 1900* F. FOR AT LEAST ONE HOUR AND THEN AT 1450 TO 1500* F. FOR AT LEAST TWO HOURS; COLD ROLLED WITH A THICKNESS REDUCTION OF FROM 35 TO 75%; AND CONTINUOUS ANNEALED AT FROM 1400 TO 1500% F.
Inventors
- 👤 Kenneth G Brickner
- 👤 O'hara Township
- 👤 George A Ratz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:51
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/02; C21D8/04; C22; C22C; C22C38/00; C22C38/18
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |