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US3459410A
Expired / Lapsed
US
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Movable-chamber heating apparatus with seal
Assignee: National Steel Corp
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Filing: 1967-10-25
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Granted: 1969-08-05
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Expires: 1987-10-25
Abstract
No abstract record available.
Inventors
- 👤 Earl C Uban
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:08
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; C21D9/54; C21D9/56; C21D9/0006; C21D9/561; C21D9/562; C21D9/565
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2869846A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-04 | 1973-02-03 | 1973-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-04 | 1977-02-03 | 1977-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-04 | 1981-02-03 | 1981-08-05 | $7700.00 | Window Closed / Lapsed |