Patent US1966733A successfully refreshed from Google Patents.
US1966733A
Expired / Lapsed
US
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Process for purifying water
Assignee: Dow Chemical Co
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Filing: 1932-08-03
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Granted: 1934-07-17
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Expires: 1952-08-03
Abstract
No abstract record available.
Inventors
- 👤 Hans A Reimers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:35
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/58; C02F1/60
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) | 1937-07-16 | 1938-01-15 | 1938-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-07-16 | 1942-01-15 | 1942-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-07-16 | 1946-01-15 | 1946-07-17 | $7700.00 | Window Closed / Lapsed |