Patent US3546142A successfully refreshed from Google Patents.
US3546142A
Expired / Lapsed
US
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Polyelectrolyte structures
Assignee: Amicon Corp
•
Filing: 1967-01-19
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Granted: 1970-12-08
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Expires: 1987-01-19
Abstract
No abstract record available.
Inventors
- 👤 Alan S Michaels
- 👤 Richard G Miekka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:26
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0002; B01D67/0006; B01D39/00; B01D39/14; B01D71/00; B01D71/06; B01D71/76; B01D71/80; B01J; B01J43/00
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) | 1973-12-07 | 1974-06-08 | 1974-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-07 | 1978-06-08 | 1978-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-07 | 1982-06-08 | 1982-12-08 | $7700.00 | Window Closed / Lapsed |