US3519558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of similar solutes using a semipermeable membrane
Assignee: Kovalus Separation Solutions LLC
•
Filing: 1968-02-15
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Granted: 1970-07-07
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Expires: 1988-02-15
Abstract
No abstract record available.
Inventors
- 👤 William W Cooper
- 👤 Richard P De Filippi
- 👤 Robert S Timmins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:00
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/14; B01D61/145; B01D61/16; B01D2311/00; B01D2311/04
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) | 1973-07-06 | 1974-01-05 | 1974-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-06 | 1978-01-05 | 1978-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-06 | 1982-01-05 | 1982-07-07 | $7700.00 | Window Closed / Lapsed |