Patent US2292305A successfully refreshed from Google Patents.
US2292305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iron sulphide metallurgy
Assignee: Individual
•
Filing: 1941-10-27
•
Granted: 1942-08-04
•
Expires: 1961-10-27
Abstract
No abstract record available.
Inventors
- 👤 Alfred M Thomsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:37
CPC Classifications
C; C21; C21B; C21B15/00; C21B13/00; C21B13/0073; C21B13/14; C22; C22B; C22B1/00; C22B1/02; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134; Y10; Y10S; Y10S75/00; Y10S75/958
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1945-08-03 | 1946-02-02 | 1946-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-08-03 | 1950-02-02 | 1950-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-08-03 | 1954-02-02 | 1954-08-04 | $7700.00 | Window Closed / Lapsed |