Patent US3586644A successfully refreshed from Google Patents.
US3586644A
Expired / Lapsed
US
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Ion exchangers from aromatic hydrocarbon polymer by reaction with sulfur halide followed by oxidation or reduction
Assignee: Nv Octrooien Activit Mij
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Filing: 1969-04-15
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Granted: 1971-06-22
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Expires: 1989-04-15
Abstract
Abstract IN THE PRODUCTION OF ION EXCHANGE RESIN, A VINYL AROMATIC HYDROCARBON POLYMER, PREFERABLY A COPOLYMER OF STYRENE AND DIVINYLBENZENE, IS REACTED WITH SULPHUR HALIDE, SUCH AS SULPHURMONOCHLORIDE, SO THAT THERE IS INTRODUCED INTO AT LEAST 30% OF THE AROMATIC NUCLEI MORE THAN ONE ACTIVE GROUP FOR EACH NUCLEUS, AND THE PRODUCT THUS FORMED DIS OXIDIZED TO PROVIDE A STRONGLY ACID CATION EXCHANGER OR REDUCED TO PROVIDE A THIOL RESIN OR ION EXCHANGER OF THE SH TYPE.
Inventors
- 👤 Geert Jan De Jong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:00
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/06; C08F8/04; C08F8/34
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |