USRE28168E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emergency atmosphere annealing furnace and method
Assignee: —
•
Filing: 1973-08-01
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Granted: 1974-09-24
•
Expires: 1993-08-01
Abstract
Abstract METHOD AND APPARATUS FOR PROTECTING A STRIP OF METAL MOVING CONTINUOUSLY THROUGH A HEATING ZONE, AGAINST EXCESSIVE OXIDATIVE DEGRADATION DURING LONGER THAN NORMAL RESIDENCE IN THE HEATING ZONE, INCLUDING A CONTROL SYSTEM RESPONSIVE TO A REDUCTION IN STRIP SPEED WHICH PURGES THE OXIDIZING INGREDIENTS IN THE HEATING ZONE ATMOSPHERE WITH A PROTECTIVE GAS.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:34
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; C21D9/54; C21D9/56; C21D9/561; C23; C23C; C23C2/00; C23C2/003; C23C2/0035; C23C2/0038; C23C2/02; C23C2/022; C23C2/0222; C23C2/0224
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |