US3493488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodialysis apparatus
Assignee: Westinghouse Electric Corp
•
Filing: 1967-06-20
•
Granted: 1970-02-03
•
Expires: 1987-06-20
Abstract
No abstract record available.
Inventors
- 👤 Francis J Sisk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:50
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D61/46; B01D61/48; B01J; B01J47/00; B01J47/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2815320A
Cited
US2854394A
Cited
US3014855A
Cited
US3084113A
Cited
US3251764A
Cited
US3149061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-02 | 1973-08-04 | 1974-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-02 | 1977-08-04 | 1978-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-02 | 1981-08-04 | 1982-02-03 | $7700.00 | Window Closed / Lapsed |