US4859462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer-treated ion exchange resins
Assignee: Fisons Corp
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Filing: 1987-05-04
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Granted: 1989-08-22
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Expires: 2007-05-04
Abstract
Abstract Sulfonic acid cationic exchange resin particles which have been treated to improve their coatability with minor amounts of high molecular weight polymers selected from carboxypolymethylene, xanthan gum, and propylene glycol alginate.
Inventors
- 👤 San-Laung Chow
- 👤 Yegnaswami Raghunathan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:38
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/14; A61K9/16; A61K9/1605; A61K9/1629; A61K9/1652; A61K47/00; A61K47/50; A61K47/51; A61K47/56; A61K47/58; A61K47/585; A61K9/1635; A61K9/48; A61K9/50; A61K9/5005; A61K9/5021; A61K9/5026; A61K9/5036; A61K9/5042; A61K9/5047; A61K9/5073
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
77 words
A process for enhancing the coatability of sulfonic acid cationic exchange resin particles which comprises contacting said particles with an aqueous solution containing from at least about 0.04% to about 1.1% by weight of a high molecular weight polymer, based on the combined weight of the polymer and the particles, said polymer being selected from the group consisting of carboxypolymethylene, xanthan gum, and propylene glycol alginate, and thereafter individually coating said particles with a water-permeable diffusion barrier.
Claim 2
Dependent Claim
77 words
A process for enhancing the coatability of sulfonic acid cationic exchange resin particles which comprises contacting said particles with an aqueous solution containing from at least about 0.04% to about 1.1% by weight of a high molecular weight polymer, based on the combined weight of the polymer and the particles, said polymer being selected from the group consisting of carboxypolymethylene, xanthan gum, and propylene glycol alginate, and thereafter individually coating said particles with a water-permeable diffusion barrier.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein the polymer is carboxypolymethylene.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein the polymer is xanthan gum.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the polymer is propylene glycol alginate.
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) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |