Patent US2438252A successfully refreshed from Google Patents.
US2438252A
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Purification of hydrogen peroxide by a nonconcentrating distillation
Assignee: Mathieson Alkali Works Inc
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Filing: 1942-02-26
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Granted: 1948-03-23
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Expires: 1962-02-26
Abstract
No abstract record available.
Inventors
- 👤 Richardson Chester Northup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:31
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/013
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US898980A
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US1145162A
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US1536213A
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US1937682A
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US1924954A
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GB330255A
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US2081097A
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US2091218A
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GB445334A
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US2210438A
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US2282184A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-23 | 1951-09-22 | 1952-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-23 | 1955-09-22 | 1956-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-23 | 1959-09-22 | 1960-03-23 | $7700.00 | Window Closed / Lapsed |