US2242759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of difficultly reducible oxides
Assignee: WALTER H DUISBERG
•
Filing: 1939-02-25
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Granted: 1941-05-20
•
Expires: 1959-02-25
Abstract
No abstract record available.
Inventors
- 👤 Schlecht Helmut
- 👤 Jahrstorfer Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:12
CPC Classifications
C; C22; C22B; C22B5/00; C22B5/02; C22B5/10
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) | 1944-05-19 | 1944-11-18 | 1945-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-05-19 | 1948-11-18 | 1949-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-05-19 | 1952-11-18 | 1953-05-20 | $7700.00 | Window Closed / Lapsed |