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Patent US3454491A successfully refreshed from Google Patents.
US3454491A
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Apparatus and process for high purity deionized water
Assignee: Dow Chemical Co
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Filing: 1966-04-14
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Granted: 1969-07-08
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Expires: 1986-04-14
Abstract
No abstract record available.
Inventors
- 👤 Lyle W Colburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:45
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/02; B01J47/04; C; C02; C02F; C02F1/00; C02F1/02; C02F1/04; C02F1/045
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-07 | 1973-01-06 | 1973-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-07 | 1977-01-06 | 1977-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-07 | 1981-01-06 | 1981-07-08 | $7700.00 | Window Closed / Lapsed |