US3565833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core-dual shell graft copolymers with ion exchange resin shells
Assignee: Orica Ltd
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Filing: 1968-12-27
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Granted: 1971-02-23
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Expires: 1988-12-27
Abstract
Abstract A GRAFT COPOLYMER WHEREIN TWO REACTIVE POLYMERS ARE GRAFTED ON TO AND SURROUND IN SHELL FORM AN INERT POLYMERIC NUCLEOUS. THE SHELL, OR SHELLS, COMPRISE SEPARATE AND DISCRETE REGIONS OF ION EXCHANGE REACTIVE GROUPS OF OPPOSITE SIGN AND THE GRAFT COPOLYMERS ARE SUITABLE AS ION EXCHANGE RESINS AFFORDING HIGH REACTION RATES AND HIGH RATES OF EQUILIBRATION.
Inventors
- 👤 Hendrik Adriaan Jacob Battaerd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:43
CPC Classifications
B; B01; B01J; B01J43/00; B01J45/00; C; C08; C08F; C08F285/00; Y; Y10; Y10S; Y10S525/00; Y10S525/902
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |