US2270376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of treating alkali metal hydroxide solutions
Assignee: Innis Speiden & Co
•
Filing: 1937-10-23
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Granted: 1942-01-20
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Expires: 1957-10-23
Abstract
No abstract record available.
Inventors
- 👤 Ladd Edward Thorndike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:31
CPC Classifications
C; C01; C01D; C01D1/00; C01D1/04; C01D1/28; C01D1/40
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) | 1945-01-19 | 1945-07-21 | 1946-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-01-19 | 1949-07-21 | 1950-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-01-19 | 1953-07-21 | 1954-01-20 | $7700.00 | Window Closed / Lapsed |