US2731145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of hot-working steel billets by forging or extrusion
Assignee: United States Steel Corp
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Filing: 1953-05-20
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Granted: 1956-01-17
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Expires: 1973-05-20
Abstract
No abstract record available.
Inventors
- 👤 Andrew F Kritscher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:32
CPC Classifications
C; C21; C21D; C21D7/00; C21D7/13; C21D1/00; C21D1/68; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4981; Y10T29/4998; Y10T29/49982
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |