US4376047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated resin ion exchange composition
Assignee: Dionex Corp
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Filing: 1981-06-18
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Granted: 1983-03-08
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Expires: 2001-06-18
Abstract
Abstract An ion exchange composition formed of insoluble synthetic resin support particles with ion exchange sites at their exposed surfaces, and fine synthetic resin layering particles with ion exchange sites on their exposed surfaces, which attract the ion exchange sites of the support particles so that the layering particles are irreversibly attached as a monolayer to the support particles. The layering particles have a median diameter ranging from 0.002 to 0.09 microns, while the ratio of median diameters of the support particles to layering particles range from 100 to 1, and 5000 to 1. The composition is packed into a column and is used for separation of ions in liquid ion exchange chromatography.
Inventors
- 👤 Christopher A. Pohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:31
CPC Classifications
B; B01; B01D; B01D15/00; B01D15/08; B01D15/26; B01D15/36; B01D15/361; B01J; B01J20/00; B01J20/30; B01J20/32; B01J20/3214; B01J20/3217; B01J20/3221; B01J39/00; B01J39/26; B01J41/00; B01J41/20; B01J47/00; B01J47/016; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/254; Y10T428/26; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
An ion exchange composition comprising synthetic resin support particles with ion exchange sites at their exposed surfaces, and fine synthetic resin layering particles with ion exchange sites on their exposed surfaces which attract the ion exchange sites of said support particles so that said layering particles are irreversibly attached as a monolayer to said support particles, said layering particles having a median diameter ranging from 0.002 to 0.08 micron, the ratio of median diameter of support particles to layering particles ranging between 100 to 1 and 5000 to 1.
Claim 2
Dependent Claim
89 words
An ion exchange composition comprising synthetic resin support particles with ion exchange sites at their exposed surfaces, and fine synthetic resin layering particles with ion exchange sites on their exposed surfaces which attract the ion exchange sites of said support particles so that said layering particles are irreversibly attached as a monolayer to said support particles, said layering particles having a median diameter ranging from 0.002 to 0.08 micron, the ratio of median diameter of support particles to layering particles ranging between 100 to 1 and 5000 to 1.
Claim 3
Dependent Claim
20 words
The composition of claim 1 in which the median diameter of said layering particles ranges from 0.007 to 0.05 microns.
Claim 4
Dependent Claim
27 words
The composition of claim 1 in which the ratio of median diameter of support particles to layering particles ranges between 200 to 1 and 2000 to 1.
Claim 5
Dependent Claim
21 words
The composition of claim 1 in which the median diameter of said substrate particles ranges from 3 microns to 100 microns.
Claim 6
Dependent Claim
21 words
The composition of claim 1 in which the median diameter of said substrate particles ranges from 3 microns to 25 microns.
Claim 7
Dependent Claim
10 words
The composition of claim 1 in a packed chromatographic column.
References Cited (Backward Citations)
US4252644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-07 | 1986-09-06 | 1987-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-07 | 1990-09-06 | 1991-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-07 | 1994-09-06 | 1995-03-08 | $7700.00 | Window Closed / Lapsed |