Patent US4351909A successfully refreshed from Google Patents.
US4351909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High performance ion-exchange composition
Assignee: Dionex Corp
•
Filing: 1981-05-21
•
Granted: 1982-09-28
•
Expires: 2001-05-21
Abstract
Abstract An ion-exchange composition comprising a substrate of a macroporous synthetic resin having ion-exchanging sites at least on its available surface; and finely divided, synthetic resin particles having a volume average diameter less than 0.1 micron and greater than about 0.005 micron and having, at least on their outer surfaces, ion-exchanging sites which attract the ion-exchanging sites of the substrate, irreversibly attached as a monolayer to the available surface of the substrate. The composition is used for removal and separation of ions, and is especially useful in liquid ion-exchange chromatography.
Inventors
- 👤 Timothy S. Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:41
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/96; 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
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
107 words
A composition of matter for exchanging ions comprising: Component A, a substrate which consists essentially of macroporous synthetic resin, having ion-exchanging sites at least on its available surface, having a volume average pore diameter of X; and Component B, finely divided synthetic resin particles having a volume average diameter (D) less than 0.08 micron and greater than 0.005 micron and having, at least on their outer surfaces, ion-exchanging sites which attract available sites of Component A; wherein the particles of Component B are irreversibly attached as a monolayer to the available surface of Component A; provided that, the ratio X/D is from about 4 to about 30.
Claim 2
Dependent Claim
107 words
A composition of matter for exchanging ions comprising: Component A, a substrate which consists essentially of macroporous synthetic resin, having ion-exchanging sites at least on its available surface, having a volume average pore diameter of X; and Component B, finely divided synthetic resin particles having a volume average diameter (D) less than 0.08 micron and greater than 0.005 micron and having, at least on their outer surfaces, ion-exchanging sites which attract available sites of Component A; wherein the particles of Component B are irreversibly attached as a monolayer to the available surface of Component A; provided that, the ratio X/D is from about 4 to about 30.
Claim 3
Dependent Claim
50 words
The composition of claim 1 wherein Component A comprises finely divided macroporous particles of about 2 to about 75 microns particle size which have ion-exchanging sites at least on their available surface and Component B particles have ion-exchanging sites substantially throughout the entirety of a majority of Component B particles.
Claim 4
Dependent Claim
20 words
The composition of claim 1 wherein the particle size of Component A particles is about 2 to about 30 microns.
Claim 5
Dependent Claim
22 words
The composition of claim 1 wherein the size range of Component B particles is from about 0.0025 micron to about 0.2 micron.
Claim 6
Dependent Claim
22 words
The composition of claim 1 wherein the volume average diameter of Component B particles is from about 0.01 to about 0.08 micron.
Claim 7
Dependent Claim
16 words
The composition of claim 1 wherein the ratio X/D is from about 5 to about 10.
Claim 8
Dependent Claim
14 words
The composition of claim 1 or 2 wherein Component A comprises a poly(vinylaromatic) resin.
Claim 9
Dependent Claim
14 words
The composition of claim 1 wherein Component B particles are ion-exchange latex resin particles.
Claim 10
Dependent Claim
10 words
A chromatographic column packed with the composition of claim 1.
References Cited (Backward Citations)
DE1045978B
Cited
US3485658A
Cited
US3847857A
Cited
US3488922A
Cited
US4101460A
Cited
US4119580A
Cited
US4200695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-27 | 1986-03-29 | 1986-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-27 | 1990-03-29 | 1990-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-27 | 1994-03-29 | 1994-09-28 | $7700.00 | Window Closed / Lapsed |