Patent US3558744A successfully refreshed from Google Patents.
US3558744A
Expired / Lapsed
US
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Process for making polyelectrolyte complex resin
Assignee: Amicon Corp
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Filing: 1968-01-05
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Granted: 1971-01-26
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Expires: 1988-01-05
Abstract
Abstract A PROCESS FOR MAKING AND PURIFYING POLYELECTROLYTE COMPLEX RESINS WHEREIN A HEATING STEP IS USED BEFORE THE WASHING OF SAID RESIN, SAID HEATING STEP CONTRIBUTING TO THE FORMATION OF A PARTICULARLY EASILY-FILTERABLE FORM OF RESIN AND ADVANTAGEOUSLY CARRIED OUT AT LEAST ABOVE THE GLASS TRANSITION TEMPERATURE OF THE BACKBONE POLYMERS FROM WHICH THE POLYELECTROLYTE COMPLEX RESIN IS FORMED.
Inventors
- 👤 Alan S Michaels
- 👤 Michael J Lysaght
- 👤 Stephen A Splitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:31
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/18; Y; Y10; Y10S; Y10S525/00; Y10S525/916; Y10S525/919
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |