US3725141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Annealing steel products
Assignee: Inland Steel Co
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Filing: 1971-11-10
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Granted: 1973-04-03
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Expires: 1991-11-10
Abstract
Abstract CARBON DEPOSITION IS AVOIDED IN A PROCESS FOR ANNEALING STEEL PRODUCTS WITH RESIDUAL LUBRICANTS THEREON, BY INTRODUCING A LOWER ALKYL ALCOHOL INTO THE ANNEALING CHAMBER DURING THE EARLY STAGES OF THE HEATING PROCESSES. CATALYSTS SUCH AS HCI ALSO MAY BE USED.
Inventors
- 👤 U Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:01
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/74; C21D1/76; C21D1/763
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |