Patent US3168486A successfully refreshed from Google Patents.
US3168486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-agglomerating mixed bed ion exchange resins and products thereof
Assignee: Dow Chemical Co
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Filing: 1960-07-22
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Granted: 1965-02-02
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Expires: 1980-07-22
Abstract
No abstract record available.
Inventors
- 👤 Small Hamish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:08
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/02; B01J47/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
65 words
A STRONGLY BASIC ORGANIC QUATERNARY AMMONIUM ANION EXCHANGE RESIN, THE SURFACE ANION EXCHANGING SITES OF WHICH HAVE ABSORBED ANIONIC MOIETIES OF A WATER-SOLUBLE POLYMERIC VINYLAROMATIC SULFONIC ACID IN AMOUNT SUFFICIENT SUBSTANTIALLY TO NEUTRALIZE SURFACE CHARGES OF SAID ANION EXCHANGE RESIN SITES, SAID WATERSOLUBLE RESINOUS POLYMERIC VINYLAROMATIC SULFONIC ACID BEING OF A MOLECULAR SIZE SUCH THAT IT DOES NOT DIFFUSE INTO THE ANION EXCHANGE RESIN PARTICLES.
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) | 1968-02-02 | 1968-08-03 | 1969-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-02 | 1972-08-03 | 1973-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-02 | 1976-08-03 | 1977-02-02 | $7700.00 | Window Closed / Lapsed |