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US3880814A Expired / Lapsed US ⏱️ 0.0 years remaining

Gel chromatography material and preparation thereof

Assignee: Individual
•
Filing: 1971-02-02
•
Granted: 1975-04-29
•
Expires: 1991-02-02
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Abstract

Abstract A new gel chromatography material is prepared as uniform spherical particles by the suspension polymerization of N, N''(diacrylamidomethyl) ethylene or propylene urea either alone or together with one or more than one monomer having a ethylenically unsaturated double bond and copolymerizable therewith, such as acrylamide, methacrylamide, acrylic acid, methacrylic acid, itaconic acid, maleic acid and bis-acrylamide. The gel chromatography material has a structure characterized by a relatively large pore size due to the long chain of the urea compound acting as a cross-linking agent, and the pore size may be altered by changing the molar ratio of the urea compound to the copolymerizing monomers. The gel chromatography material is useful not only for separating various high molecular weight substances, such as proteins, from low molecular weight compounds in aqueous solution, but it is also effective for the separation of various compounds having different molecular size.

Inventors

  • 👤 Kiyoshi Mizutani

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 13:10
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/281; B01J20/291; B01J20/22; C; C08; C08F; C08F220/00; C08F220/02; C08F220/52; C08F220/54; C08F220/60; C08F220/603; B01J2220/00; B01J2220/50; B01J2220/54

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 45 words
A PROCESS FOR PREPARING A CROSS-LINKED POLYMERIC GEL CHROMATOGRAPHY MATERIAL, WHICH COMPRISES SUBJECTING AT LEAST ONE ETHYLENICALLY UNSATURATED COMPOUND SELECTED FROM THE GROUP CONSISTING OF ACRYLAMIDE, METHACRYLAMIDE, ACRYLIC ACID, METHACRYLIC ACID, ITACONIC ACID, MALEIC ACID AND BISACARYLAMIDE, AND AT LEAST ONE COMPOUND HAVING THE FORMULA:
Claim 2
Dependent Claim 45 words
A PROCESS FOR PREPARING A CROSS-LINKED POLYMERIC GEL CHROMATOGRAPHY MATERIAL, WHICH COMPRISES SUBJECTING AT LEAST ONE ETHYLENICALLY UNSATURATED COMPOUND SELECTED FROM THE GROUP CONSISTING OF ACRYLAMIDE, METHACRYLAMIDE, ACRYLIC ACID, METHACRYLIC ACID, ITACONIC ACID, MALEIC ACID AND BISACARYLAMIDE, AND AT LEAST ONE COMPOUND HAVING THE FORMULA:

References Cited (Backward Citations)

US3369008A Cited
US3580879A Cited
US3350363A Cited
US3681269A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-04-28 1978-10-28 1979-04-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-04-28 1982-10-28 1983-04-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-04-28 1986-10-28 1987-04-29 $7700.00 Window Closed / Lapsed

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