US3826693A
Expired / Lapsed
US
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Atmosphere controlled annealing process
Assignee: Bethlehem Steel Corp
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Filing: 1973-01-29
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Granted: 1974-07-30
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Expires: 1993-01-29
Abstract
Abstract A METHOD OF CONTROLLING THE SURFACE APPEARANCE OF CONTINUOUS ANNEALED AND TEMPER ROLLED STEEL STRIP SUITABLE FOR USE IN THE MANUFACTURE OF METALLIC COATED STEEL STRIP, SUCH AS TIN PLATE. THE BRIGHT AND UNIFORM APPEARANCE OF THE STRIP IS ACHIEVED BY PROVIDING A PRPTECTIVE ATMOS PHERE CONTAINING A MAXIMUM OF ABOUT 1.5% HYDROGEN DURING THE CONTROLLED COOLING DOWN TO ABOUT 1000'''' 1., AND A MAXIMUM OF ABOUT 0.5% HYDROGEN DURING THE RAPID COOLING DOWN TO BELOW ABOUT 250*F.
Inventors
- 👤 T Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:16
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/02; C21D8/0247; C21D8/0273; C21D9/00; C21D9/52; C21D9/54; C21D9/56; C21D9/561; C21D1/00; C21D1/74; C21D1/76; C21D8/0221; C21D8/0236; C21D8/0278
Claims Analysis
Total Claims: 0
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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) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |