Patent US4783378A successfully refreshed from Google Patents.
US4783378A
Expired / Lapsed
US
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Steel sheets for drawing and ironing worked cans
Assignee: JFE Steel Corp
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Filing: 1987-06-23
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Granted: 1988-11-08
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Expires: 2007-06-23
Abstract
Abstract A steel sheet for DI can having improved DI workability and resistance to die abrasion has such a surface profile that a center-line average surface roughness is within a range of 0.1˜4.0 μm and a microscopic shape is comprised of mountain portions, groove-like valley portions and middle flat portions satisfying particular dimension relations.
Inventors
- 👤 Tsuneyoshi Wakui
- 👤 Takeo Ohnishi
- 👤 Yuji Shimoyama
- 👤 Toshio Akizuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:00
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/46; C21D9/48; B; B21; B21D; B21D22/00; B21D22/20; B21D22/201; B21B; B21B1/00; B21B1/22; B21B1/227; B21B2001/228; B21B2261/00; B21B2261/14; B21B2267/00; B21B2267/10; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/925; Y10T; Y10T428/00; Y10T428/12; Y10T428/12389; Y10T428/12993
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A steel sheet for drawing and ironing worked cans, characterized in that a center-line average surface roughness Ra of said steel sheet is within a range of 0.1˜4.0 μm, and a microscopic shape constituting said surface roughness is comprised of trapezoidal mountain portions having a flat top surface, groove-like valley portions formed so as to surround a whole or a part of the mountain portion and middle flat portions formed between the mountain portions outside the valley portion so as to be higher than the bottom of the valley portion and lower than or equal to the top surface of the mountain portion and satisfies the following relations: 1.0≦Sm/D≦1.7 30≦d≦500 (μm) , wherein Sm is a mean center distance between the adjoining mountain portions, D is a mean diameter in the outer periphery of the valley portion and d is a mean diameter in the flat top surface of the mountain portion.
Claim 2
Dependent Claim
152 words
A steel sheet for drawing and ironing worked cans, characterized in that a center-line average surface roughness Ra of said steel sheet is within a range of 0.1˜4.0 μm, and a microscopic shape constituting said surface roughness is comprised of trapezoidal mountain portions having a flat top surface, groove-like valley portions formed so as to surround a whole or a part of the mountain portion and middle flat portions formed between the mountain portions outside the valley portion so as to be higher than the bottom of the valley portion and lower than or equal to the top surface of the mountain portion and satisfies the following relations: 1.0≦Sm/D≦1.7 30≦d≦500 (μm) , wherein Sm is a mean center distance between the adjoining mountain portions, D is a mean diameter in the outer periphery of the valley portion and d is a mean diameter in the flat top surface of the mountain portion.
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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) | 1991-11-08 | 1992-05-09 | 1992-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-08 | 1996-05-09 | 1996-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-08 | 2000-05-09 | 2000-11-08 | $7700.00 | Window Closed / Lapsed |