Patent US4353801A successfully refreshed from Google Patents.
US4353801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Special solvent column for GPC and GPC method using the same
Assignee: Resonac Corp
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Filing: 1980-09-17
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Granted: 1982-10-12
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Expires: 2000-09-17
Abstract
Abstract A special solvent column for gel-permeation chromatography packed with porous styrene-divinylbenzene type copolymer spherical particles in immersed and swollen state with a special eluent, which is a mixture of hexafluoroisopropanol and a chlorine-containing organic solvent such as chloroform, is effective for enlarging the range of samples to be analyzed and molecular-weight distribution measurement can be conducted rapidly at normal temperatures by using said column.
Inventors
- 👤 Yoshiyuki Mukoyama
- 👤 Nobutoshi Chikazumi
- 👤 Hatuo Sugitani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:58
CPC Classifications
B; B01; B01D; B01D15/00; B01D15/08; B01D15/26; B01D15/34; B01D15/42; B01D15/424; B01D15/426
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
65 words
In a column for gel-permeation chromatography packed with porous styrene-divinylbenzene type copolymer spherical particles which are in an immersed and swollen state with an eluent prior to use, the improvement wherein said eluent is a mixture of hexafluoroisopropanol and a chlorine-containing organic solvent and wherein the mixing ratio of the hexafluoroisopropanol to the chlorine-containing organic solvent in the mixture is 5/95 to 70/30 by volume.
Claim 2
Dependent Claim
65 words
In a column for gel-permeation chromatography packed with porous styrene-divinylbenzene type copolymer spherical particles which are in an immersed and swollen state with an eluent prior to use, the improvement wherein said eluent is a mixture of hexafluoroisopropanol and a chlorine-containing organic solvent and wherein the mixing ratio of the hexafluoroisopropanol to the chlorine-containing organic solvent in the mixture is 5/95 to 70/30 by volume.
Claim 3
Dependent Claim
25 words
A column for gel-permeation chromatography according to claim 1, wherein the chlorine-containing organic solvent is chloroform, tetrachloroethane, trichloroethane, trichloroethylene, dichlorobenzene, trichlorobenzene, or a mixture thereof.
Claim 4
Dependent Claim
24 words
A column for gel-permeation chromatography according to claim 1, wherein the chlorine-containing organic solvent is at least one chlorinated hydrocarbon having 1-7 carbon atoms.
Claim 5
Dependent Claim
19 words
A column for gel-permeation chromatography according to claim 1, 2 or 3, wherein the chlorine-containing organic solvent is chloroform.
Claim 6
Dependent Claim
83 words
In a gel-permeation chromatographic method comprising passing an eluent dissolving a substance to be measured through a column packed with porous styrene-divinylbenzene type copolymer spherical particles in an immersed and swollen state with said eluent, and fractionating the substance depending on the largeness of molecular weight of said substance, the improvement which comprises using as the eluent a mixture of hexafluoroisopropanol and a chlorine-containing organic solvent in a mixing ratio of hexafluoroisopropanol to the chlorine-containing organic solvent of 5/95 to 70/30 by volume.
Claim 7
Dependent Claim
83 words
In a gel-permeation chromatographic method comprising passing an eluent dissolving a substance to be measured through a column packed with porous styrene-divinylbenzene type copolymer spherical particles in an immersed and swollen state with said eluent, and fractionating the substance depending on the largeness of molecular weight of said substance, the improvement which comprises using as the eluent a mixture of hexafluoroisopropanol and a chlorine-containing organic solvent in a mixing ratio of hexafluoroisopropanol to the chlorine-containing organic solvent of 5/95 to 70/30 by volume.
Claim 8
Dependent Claim
13 words
A method according to claim 5, wherein the chlorine-containing organic solvent is chloroform.
Claim 9
Dependent Claim
21 words
A method according to claim 5, wherein the chlorine-containing organic solvent is at least one chlorinated hydrocarbon having 1-7 carbon atoms.
Claim 10
Dependent Claim
12 words
A method according to claim 5, wherein said substance is a resin.
Claim 11
Dependent Claim
39 words
A method according to claim 8, wherein the resin is selected from a group consisting of polystyrene, an acrylic resin, polyethylene terephthalate, a polyethylene terephthalate oligomer, polyesterimide, polyesteramide, polyimide, polyamide-imide, polyamide, an epoxy resin, phenolic resin, and melamine resin.
Claim 12
Dependent Claim
35 words
A method according to claim 9, wherein said resin is selected from a group consisting of polyimide, polyamide, polyamide-imide, polyesteramide, polyethylene terephthalate, and a polyethylene terephthalate oligomer and said substance is measured at normal temperatures.
References Cited (Backward Citations)
US3725260A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-11 | 1986-04-12 | 1986-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-11 | 1990-04-12 | 1990-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-11 | 1994-04-12 | 1994-10-12 | $7700.00 | Window Closed / Lapsed |