US2227255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for treating a molten metallic material
Assignee: Individual
•
Filing: 1939-08-10
•
Granted: 1940-12-31
•
Expires: 1959-08-10
Abstract
No abstract record available.
Inventors
- 👤 Gronwall Eugen Assar Alexis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:02
CPC Classifications
C; C22; C22B; C22B9/00; C22B9/02; F; F27; F27B; F27B14/00; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S29/00; Y10S29/046
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) | 1943-12-31 | 1944-07-01 | 1944-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-12-31 | 1948-07-01 | 1948-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-12-31 | 1952-07-01 | 1952-12-31 | $7700.00 | Window Closed / Lapsed |