Patent US3568840A successfully refreshed from Google Patents.
US3568840A
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US
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Packing materials for gel permeation chromatography
Assignee: Mitsubishi Chemical Corp
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Filing: 1968-12-24
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Granted: 1971-03-09
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Expires: 1988-12-24
Abstract
Abstract Packing material to be packed in columns of gel permeation chromatographic devices. The packing material comprises alumina having a particle size ranging from 10 to 70 microns, a distribution peak ranging from 10 to 105 Angstrom units, and a ratio of the bottom extent of the sharp portion of the pore size distribution curve to the distribution peak of less than 2.
Inventors
- 👤 Atsushi Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:52
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/50; G01N30/52; B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/08; B01J20/28; B01J20/28002; B01J20/28004; B01J20/28054; B01J20/28088; B01J20/2809; B01J20/281; B01J20/282; B01J20/284; B01J2220/00; B01J2220/50; B01J2220/54
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
30 words
A packing material according to claim 1 wherein said particle size range is from 30 to 60 microns, and said distribution peak range is from 50 to 104 Angstrom units.
Claim 2
Dependent Claim
30 words
A packing material according to claim 1 wherein said particle size range is from 30 to 60 microns, and said distribution peak range is from 50 to 2500 Angstrom units.
Claim 3
Dependent Claim
35 words
A packing material according to claim 1 wherein said alumina is Theta -alumina, said particle size range is from 30 to 50 microns, and said distribution peak range is from 150 to 1000 Angstrom units.
Claim 4
Dependent Claim
34 words
A packing material according to claim 1 wherein said alumina is boehmite, said particle size range is from 30 to 50 microns, and said distribution peak range is from 50 to 1000 Angstrom units.
Claim 5
Dependent Claim
34 words
A packing material according to claim 1 wherein said alumina is Alpha -alumina, said particle range is from 30 to 50 microns and said distribution peak range is from 900 to 2500 Angstrom units.
Claim 6
Dependent Claim
13 words
A chromatography column packed with a packing material as defined in claim 1.
Claim 7
Dependent Claim
24 words
In a gel permeation chromatographic device the improvement which comprises at least one column packed with a packing material as defined in claim 1.
Claim 8
Dependent Claim
69 words
A packing material for use in gel permeation chromatograpHy, said material comprising a mixture of aluminas, each of said aluminas having different pore distribution peaks, a particle size ranging from 10 to 70 microns, a distribution peak ranging from 10 to 105 Angstrom units and a ratio of the bottom extent of the sharp portion of the pore size distribution curve to the distribution peak of less than 2:1.
Claim 9
Dependent Claim
40 words
A packing material according to claim 9 wherein said mixture of aluminas is a mixture of Theta -aluminas, said particle size range is from 30 to 50 microns, and said distribution peak range is from 150 to 1000 Angstrom units.
Claim 10
Dependent Claim
39 words
A packing material according to claim 9 wherein said mixture of aluminas is a mixture of boehmite, said particle size range is from 30 to 50 microns, and said distribution peak range is from 50 to 1000 Angstrom units.
Claim 11
Dependent Claim
40 words
A packing material according to claim 9 wherein said mixture of aluminas is a mixture of Alpha -aluminas, said particle size range is from 30 to 50 microns, and said distribution peak range is from 900 to 2500 Angstrom units.
Claim 12
Dependent Claim
81 words
(a) packing material according to claim 9 wherein said mixture of aluminas is a mixture of at least two types of alumina selected from the group consisting of (a) Theta -alumina having a distribution peak ranging from 50 to 1000 Angstrom units, (b) boehmite having a distribution peak ranging from 50 to 1000 Angstrom units and (c) Alpha -alumina having a distribution peak ranging from 900 to 2500 Angstrom units, and said particle size range is from 30 to 50 microns.
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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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |