US2124564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal purification
Assignee: EIDP Inc
•
Filing: 1936-11-04
•
Granted: 1938-07-26
•
Expires: 1956-11-04
Abstract
No abstract record available.
Inventors
- 👤 Harvey N Gilbert
- 👤 Norval D Clare
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:25
CPC Classifications
C; C22; C22B; C22B26/00; C22B26/10
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) | 1941-07-25 | 1942-01-24 | 1942-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-07-25 | 1946-01-24 | 1946-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-07-25 | 1950-01-24 | 1950-07-26 | $7700.00 | Window Closed / Lapsed |