US3228867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodialysis device
Assignee: AMF Inc
•
Filing: 1962-03-30
•
Granted: 1966-01-11
•
Expires: 1982-03-30
Abstract
No abstract record available.
Inventors
- 👤 Chen William Kwo-Wei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:28
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D61/46; B01D61/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA562882A
Cited
US2093770A
Cited
US2848402A
Cited
US2741591A
Cited
US2694680A
Cited
US2777811A
Cited
US2848403A
Cited
US2854394A
Cited
US2794777A
Cited
US2891900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |