Patent US2195917A successfully refreshed from Google Patents.
US2195917A
Expired / Lapsed
US
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Manufacture of sodium hydroxide from sodium chloride
Assignee: Imperial Chemical Industries Ltd
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Filing: 1936-10-20
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Granted: 1940-04-02
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Expires: 1956-10-20
Abstract
No abstract record available.
Inventors
- 👤 Clifford Ivor Laurance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:13
CPC Classifications
C; C01; C01D; C01D1/00; C01D1/04; C01D1/20
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) | 1943-04-02 | 1943-10-02 | 1944-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-04-02 | 1947-10-02 | 1948-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-04-02 | 1951-10-02 | 1952-04-02 | $7700.00 | Window Closed / Lapsed |