US4810381A
Expired / Lapsed
US
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Composite chromatographic article
Assignee: 3M Co
•
Filing: 1987-12-28
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Granted: 1989-03-07
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Expires: 2007-12-28
Abstract
Abstract A composite chromatographic article comprising: (a) a polytetrafluoroethylene fibril matrix, and (b) non-swellable sorptive particles enmeshed in said matrix, the ration of non-swellable sorptive particles to polytetrafluoroethylene being in the range of 19:1 to 4:1 by weight, said composite article having a net surface energy in the range of 20 to 300 milliNewtons per meter.
Inventors
- 👤 Donald F. Hagen
- 👤 Steven J. St. Mary
- 👤 Louis A. Errede
- 👤 Peter W. Carr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:31
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/28; B01J20/28014; B01J20/28028; B01J20/28033; Y; Y10; Y10S; Y10S435/00; Y10S435/803; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249954; Y10T428/249986
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
55 words
A composite chromatographic article comprising: (a) a polytetrafluoroethylene fibril matrix, and (b) non-swellable sorptive particles enmeshed in said matrix, the ratio of non-swellable sorptive particles to polytetrafluoroethylene being in the range of 19:1 to 4:1 by weight, said composite article having a net surface energy in the range of 20 to 300 milliNewtons per meter.
Claim 2
Dependent Claim
55 words
A composite chromatographic article comprising: (a) a polytetrafluoroethylene fibril matrix, and (b) non-swellable sorptive particles enmeshed in said matrix, the ratio of non-swellable sorptive particles to polytetrafluoroethylene being in the range of 19:1 to 4:1 by weight, said composite article having a net surface energy in the range of 20 to 300 milliNewtons per meter.
Claim 3
Dependent Claim
14 words
The chromatographic article according to claim 1 wherein said non-swellable particles are inorganic oxide.
Claim 4
Dependent Claim
15 words
The chromatographic article according to claim 1 wherein said non-swellable particles are an organic compound.
Claim 5
Dependent Claim
14 words
The chromatographic article according to claim 1 wherein said non-swellable particles are a polymer.
Claim 6
Dependent Claim
19 words
The chromatographic article according to claim 2 wherein said non-swellable particles are at least one of silica and zirconia.
Claim 7
Dependent Claim
16 words
The chromatographic article according to claim 1 wherein said non-swellable particles are chelating ion exchange particles.
Claim 8
Dependent Claim
19 words
The chromatographic article according to claim 1 wherein said particles further comprise a layer of covalently bonded organic coating.
Claim 9
Dependent Claim
17 words
The chromatographic article according to claim 1 wherein said particles further comprise a coating of non-swellable polymer.
Claim 10
Dependent Claim
15 words
The chromatographic article according to claim 1 which has been subjected to electron beam treatment.
Claim 11
Dependent Claim
33 words
The chromatographic article according to claim 1 wherein said matrix further comprises in the range of more than zero and up to 28.99 parts per part of PTFE of non-swellable property modifying particles.
Claim 12
Dependent Claim
50 words
The chromatographic article according to claim 10 wherein said property modifying particles are selected from the group consisting of calcium carbonate, ammonium carbonate, kaolin, sugar, polyethylenes, polypropylenes, polyesters, polyamides, polyurethanes, polycarbonates, zeolites, chitosan, glass beads, vermiculite, clay, ceramics, coloring and fluorescing particles, pH modifiers, and particles coated with these substances.
Claim 13
Dependent Claim
25 words
The chromatographic article according to claim 1 further comprising water-swellable property modifying particles in an amount up to 30% by weight of the total particles.
Claim 14
Dependent Claim
35 words
The method according to claim 12 wherein said water-swellable property modifying particles are selected from the group consisting of starch, modified starches, agarose, polyacrylamides, ion exchange or chelating particles, cellulosics, polymethacrylates, styrene-divinylbenzene copolymers, and chitosan.
Claim 15
Dependent Claim
11 words
The chromatographic article according to claim 1 further comprising a substrate.
Claim 16
Dependent Claim
22 words
The chromatographic article according to claim 14 wherein said substrate is selected from the group consisting of glass, paper, metal, and polymers.
Claim 17
Dependent Claim
12 words
The chromatographic article according to claim 1 which is a self-supporting disk.
Claim 18
Dependent Claim
17 words
The chromatographic article according to claim 1 which is in the form of a strip or sheet.
Claim 19
Dependent Claim
22 words
The chromatographic article according to claim 1 which is useful in at least one of a direct and a reverse phase separation.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |