US3476370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Annealing furnace seal
Assignee: United States Steel Corp
•
Filing: 1968-01-19
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Granted: 1969-11-04
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Expires: 1988-01-19
Abstract
No abstract record available.
Inventors
- 👤 Donald L Ashbaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:07
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; C21D9/54; C21D9/663; C21D9/673
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2600094A
Cited
US2998236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |