Patent US3309238A successfully refreshed from Google Patents.
US3309238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deep drawing of stainless steels, and steel therefor
Assignee: Krupp Stahl AG
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Filing: 1963-05-14
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Granted: 1967-03-14
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Expires: 1983-05-14
Abstract
No abstract record available.
Inventors
- 👤 Alfred Randak
- 👤 Hans Lentzen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:08
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C21; C21D; C21D8/00; C21D8/02; C21D8/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
PRODUCTION OF A DEEP DRAWN PRODUCT OF FERRITIC STEEL CONTAINING ABOUT 14-2% CHROMIUM AND SUBSTANTIALLY FREE OF STRETCH STRAINS WHICH COMPRISES: (A) COLD ROLLING THE STEEL TO THE DRAWINT THICKNESS; (B) ANNEALING THE STEEL AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO IMPART THERETO, UPON COOLING A MINOR PROPORTION OF MARTENSITE OR BAINITE STRUTURE AND A MAJOR JPROPORTION OF FERRITE STRUCTURE AND TO PROVIDE THE STEEL AMENABLE TO DEEP DRAWING WITHOUT THE OCCURRENCE OF LUDERS'' LINES; (C) SUBJECTING THE STEEL TO DEEP DRAWING TO FORM SAID PRODUCT.
Claim 2
Dependent Claim
88 words
PRODUCTION OF A DEEP DRAWN PRODUCT OF FERRITIC STEEL CONTAINING ABOUT 14-2% CHROMIUM AND SUBSTANTIALLY FREE OF STRETCH STRAINS WHICH COMPRISES: (A) COLD ROLLING THE STEEL TO THE DRAWINT THICKNESS; (B) ANNEALING THE STEEL AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO IMPART THERETO, UPON COOLING A MINOR PROPORTION OF MARTENSITE OR BAINITE STRUTURE AND A MAJOR JPROPORTION OF FERRITE STRUCTURE AND TO PROVIDE THE STEEL AMENABLE TO DEEP DRAWING WITHOUT THE OCCURRENCE OF LUDERS'' LINES; (C) SUBJECTING THE STEEL TO DEEP DRAWING TO FORM SAID PRODUCT.
References Cited (Backward Citations)
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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) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |