US3711429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arsonium and stibonium anion exchangers
Assignee: Tokyo Institute of Technology
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Filing: 1971-03-22
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Granted: 1973-01-16
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Expires: 1991-03-22
Abstract
Abstract Anion exchangers characterized by superior and unique properties are provided which are polystyrene-divinylbenzene copolymers having an exchange group in the molecule, the exchange group being an ''''-CH2X R'''' group (wherein X is an As or Sb atom, and R is a methyl group).
Inventors
- 👤 T Ito
- 👤 Y Hoshino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:53
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/44; B; B01; B01J; B01J41/00; B01J41/08; B01J41/12; B01J41/14; B01J47/00; B01J47/016
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
An anion exchanger according to claim 1 wherein X is an arsenic atom.
Claim 2
Dependent Claim
13 words
An anion exchanger according to claim 1 wherein X is an antimony atom.
References Cited (Backward Citations)
SU201637A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |