US1733879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of purifying caustic soda
Assignee: Occidental Chemical Corp
•
Filing: 1926-08-12
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Granted: 1929-10-29
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Expires: 1946-08-12
Abstract
No abstract record available.
Inventors
- 👤 Albert H Hooker
- 👤 Marsh William Judson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:40
CPC Classifications
C; C01; C01D; C01D1/00; C01D1/04; C01D1/28; C01D1/30
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) | 1932-10-28 | 1933-04-29 | 1933-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-10-28 | 1937-04-29 | 1937-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-10-28 | 1941-04-29 | 1941-10-29 | $7700.00 | Window Closed / Lapsed |