US3420774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regeneration of weakly acidic cation exchangers charged with detergents
Assignee: Bayer AG
•
Filing: 1966-03-29
•
Granted: 1969-01-07
•
Expires: 1986-03-29
Abstract
No abstract record available.
Inventors
- 👤 Christian Oehme
- 👤 Hans Brost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:22
CPC Classifications
B; B01; B01J; B01J49/00; B01J49/50; B01J49/53; B01J49/05; B01J49/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3305306A
Cited
US3275548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |