US3606289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for annealing steel coils
Assignee: Allegheny Ludlum Corp
•
Filing: 1969-02-26
•
Granted: 1971-09-20
•
Expires: 1989-02-26
Abstract
Abstract A FURNACE FOR ANNEALING WHOLE COILS OF SILICON STEEL WHICH INCLUDES A WELDED GAS TIGHT SHEEL LINED WITH VARYING THICKNESS REFRACTORY MATERIAL DEFINING A PLURALITY OF INDEPENDENTLY CONTROLLABLE HEATING AND COOLING ZONES, AND IN WHICH A HYDROGEN ATMOSPHERE IS MAINTAINED, THE FURNACE HAVING CARS OF SPECIAL DESIGN FOR TRANSPORTING THE COILS THERETHROUGH, SPECIAL HEATING ELEMENTS EXTENDING ALONG THE FURNACE WALLS OF THE HEATING ZONE AND A SUPPLEMENTAL COOLING ARRANGEMENT FOR THE COILS TO PROVIDE A CONTROLLED HEAT TREATMENT.
Inventors
- 👤 William M Bloom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:46
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/74
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |