US2197259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for adding lead to steel
Assignee: Inland Steel Co
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Filing: 1938-05-02
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Granted: 1940-04-16
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Expires: 1958-05-02
Abstract
No abstract record available.
Inventors
- 👤 Nead John Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:31
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/04; C22C33/06; C21; C21C; C21C7/00; C21C7/0006
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) | 1943-04-16 | 1943-10-16 | 1944-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-04-16 | 1947-10-16 | 1948-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-04-16 | 1951-10-16 | 1952-04-16 | $7700.00 | Window Closed / Lapsed |