US2664369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of softening low-carbon medium-alloy steel
Assignee: United States Steel Corp
•
Filing: 1951-08-06
•
Granted: 1953-12-29
•
Expires: 1971-08-06
Abstract
No abstract record available.
Inventors
- 👤 Jr John M Kiefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:19
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/62; C21D1/63; C21D1/18; C21D1/25; C21D6/00; C21D6/005; C21D6/02; C22; C22C; C22C38/00; C22C38/02; C22C38/04; C22C38/18; C22C38/40; C22C38/44; C21D2211/00; C21D2211/001; C21D2211/005; C21D2211/008
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1592181A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-28 | 1957-06-29 | 1957-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-28 | 1961-06-29 | 1961-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-28 | 1965-06-29 | 1965-12-29 | $7700.00 | Window Closed / Lapsed |