US2458253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for metals distillation
Assignee: Dow Chemical Co
•
Filing: 1945-05-30
•
Granted: 1949-01-04
•
Expires: 1965-05-30
Abstract
No abstract record available.
Inventors
- 👤 Douglas S Chisholm
- 👤 Jr Thomas Griswold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:48
CPC Classifications
C; C22; C22B; C22B5/00; C22B5/02; C22B5/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-04 | 1952-07-05 | 1953-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-04 | 1956-07-05 | 1957-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-04 | 1960-07-05 | 1961-01-04 | $7700.00 | Window Closed / Lapsed |