US2257133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treatment of metals
Assignee: AGNES J REEVES GREER
•
Filing: 1939-06-14
•
Granted: 1941-09-30
•
Expires: 1959-06-14
Abstract
No abstract record available.
Inventors
- 👤 Robert W Shoemaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:51
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23C; C23C22/00; C23C22/05; C23C22/60; C23C22/62; C23G; C23G1/00
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) | 1944-09-29 | 1945-03-31 | 1945-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-09-29 | 1949-03-31 | 1949-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-09-29 | 1953-03-31 | 1953-09-30 | $7700.00 | Window Closed / Lapsed |