US2517557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for smelting of metals
Assignee: Standard Oil Development Co
•
Filing: 1947-06-14
•
Granted: 1950-08-08
•
Expires: 1967-06-14
Abstract
No abstract record available.
Inventors
- 👤 Hugh S Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:01
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/0006; C21B13/0013; C21B13/10; C21B2100/00; C21B2100/60; C21B2100/66; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-07 | 1954-02-06 | 1954-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-07 | 1958-02-06 | 1958-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-07 | 1962-02-06 | 1962-08-08 | $7700.00 | Window Closed / Lapsed |