Patent US3423336A successfully refreshed from Google Patents.
US3423336A
Expired / Lapsed
US
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Weak base anion exchange resin and process of preparing same
Assignee: Rohm and Haas Co
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Filing: 1965-10-18
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Granted: 1969-01-21
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Expires: 1985-10-18
Abstract
No abstract record available.
Inventors
- 👤 Richard G Bufton
- 👤 Irving M Abrams
- 👤 Frederick L Burnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:27
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44; C08F8/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |