US2739807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the reduction of metal oxides by superheated gases
Assignee: Individual
•
Filing: 1952-08-29
•
Granted: 1956-03-27
•
Expires: 1972-08-29
Abstract
No abstract record available.
Inventors
- 👤 Isobel E Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:09
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/02; C21B13/0073; F; F27; F27B; F27B17/00; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/122; Y02P10/134
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1729534A
Cited
US1775955A
Cited
US2345067A
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US2476628A
Cited
US2411487A
Cited
US2609288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |