US2446868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for purifying aqueous alkali metal hydroxides
Assignee: Diamond Shamrock Corp
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Filing: 1943-09-25
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Granted: 1948-08-10
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Expires: 1963-09-25
Abstract
No abstract record available.
Inventors
- 👤 Cunningham George Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:15
CPC Classifications
C; C01; C01D; C01D1/00; C01D1/04; C01D1/28; C01D1/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1202081A
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US1453206A
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US1712830A
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GB255880A
Cited
US2022274A
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US1968544A
Cited
US2075179A
Cited
US2127496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-10 | 1952-02-09 | 1952-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-10 | 1956-02-09 | 1956-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-10 | 1960-02-09 | 1960-08-10 | $7700.00 | Window Closed / Lapsed |