US3754873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cold rolled sheet
Assignee: United States Steel Corp
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Filing: 1971-02-03
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Granted: 1973-08-28
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Expires: 1991-02-03
Abstract
Abstract A cold rolled steel sheet or strip has a plurality of closely spaced, low, generally frustospherical projections of substantially uniform shape and height throughout its surface, the arithmetic average roughness of the surface being between 20 and 400 microinches.
Inventors
- 👤 M Bills
- 👤 H Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:35
CPC Classifications
B; B21; B21B; B21B27/00; B21B27/005; B21B1/00; B21B1/22; B21B1/227; B23; B23H; B23H9/00; B23H9/04; B21B2267/00; B21B2267/10; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12389; Y10T428/12993; Y10T428/24; Y10T428/24355
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
26 words
A cold rolled metal sheet produced according to claim 1 in which the arithmetic average roughness of the roll surface is between 20 and 80 microinches.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |