Patent US2219897A successfully refreshed from Google Patents.
Patent US3915839A successfully refreshed from Google Patents.
US3915839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for isoelectric focusing
Assignee: Pfizer Health AB
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Filing: 1973-05-02
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Granted: 1975-10-28
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Expires: 1993-05-02
Abstract
Abstract A method for reducing the time required to obtain separation with a great resolution of components in a sample solution by isoelectric focusing consists of applying an electrical field between a pair of electrodes positioned at the top and bottom of density gradient columns in successive steps, a succeeding step being performed with a density gradient column having a smaller cross-section perpendicular to the electrical field than that of the column used in the preceding step.
Inventors
- 👤 Svante Harry Rilbe
- 👤 Jarl Sune Pettersson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:28
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/447; G01N27/44756; G01N27/44795
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
149 words
APPARATUS FOR THE SEPARATION OF COMPONENTS IN A SAMPLE SOLUTION BY ISOELECTRIC FOCUSING IN WHICH SAID FOCUSING IS PERFORMED IN AT LEAST TWO SUCCESSIVE FOCUSING STEPS COMPRISING, CLOSED CONTAINER MEANS TO BE DISPOSED IN A FIRST POSITION DURING SAID FORCUSING STEPS AND IN A SECOND POSITION DURING THE SECOND FOCUSING STEP, THE INTERIOR THEREOF DEFINING A FOCUSING CHAMBER, AT LEAST TWO PAIRS OF OPPOSITELY DISPOSED WALLS THE MEANS AREA OF ONE PAIR OF SAID WALLS BEING LESS THAN THE MEAN AREA OF THE OTHER PAIR OF SAID WALLS, THE MEAN DISTANCE BETWEEN SAID ONE PAIR OF WALLS BEING GREATER THAN THE MEAN DISTANCE BETWEEN SAID OTHER PAIR OF WALLS, AN ELECTRODE SYSTEM FOR SELECTIVELY GENERATING A VERTICAL ELECTRICAL FIELD ACROSS SAID SAMPLE BETWEEN THE RESPECTIVE INNER SURFACE OF EACH PAIR OF SAID TWO PAIRS OF OPPISITELY DISPOSED WALLS IN EITHER OF SAID FIRST SECOND POSITIONS OF THE CONTAINER MEANS.
Claim 2
Dependent Claim
149 words
APPARATUS FOR THE SEPARATION OF COMPONENTS IN A SAMPLE SOLUTION BY ISOELECTRIC FOCUSING IN WHICH SAID FOCUSING IS PERFORMED IN AT LEAST TWO SUCCESSIVE FOCUSING STEPS COMPRISING, CLOSED CONTAINER MEANS TO BE DISPOSED IN A FIRST POSITION DURING SAID FORCUSING STEPS AND IN A SECOND POSITION DURING THE SECOND FOCUSING STEP, THE INTERIOR THEREOF DEFINING A FOCUSING CHAMBER, AT LEAST TWO PAIRS OF OPPOSITELY DISPOSED WALLS THE MEANS AREA OF ONE PAIR OF SAID WALLS BEING LESS THAN THE MEAN AREA OF THE OTHER PAIR OF SAID WALLS, THE MEAN DISTANCE BETWEEN SAID ONE PAIR OF WALLS BEING GREATER THAN THE MEAN DISTANCE BETWEEN SAID OTHER PAIR OF WALLS, AN ELECTRODE SYSTEM FOR SELECTIVELY GENERATING A VERTICAL ELECTRICAL FIELD ACROSS SAID SAMPLE BETWEEN THE RESPECTIVE INNER SURFACE OF EACH PAIR OF SAID TWO PAIRS OF OPPISITELY DISPOSED WALLS IN EITHER OF SAID FIRST SECOND POSITIONS OF THE CONTAINER MEANS.
Claim 3
Dependent Claim
14 words
Apparatus according to claim 1 which includes means for externally cooling said focusing chamber.
Claim 4
Dependent Claim
26 words
The invention defined in claim 1, wherein said closed container means is rotated bodily about a single axis for movement between said first and second positions.
Claim 5
Dependent Claim
64 words
The invention defined in claim 1, wherein said electrode system includes a separate vessel contianing an electrode and an electrolyte solution therein, said separate vessel and said closed container means being separated from each other by a convection breaking electrolytically conducting membrane, said membrane defining at least one of said two pairs of walls, said membrane separating the sample solution from the electrolytic solution.
Claim 6
Dependent Claim
17 words
The invention defined in claim 4, wherein said separate vessel includes means for cooling said electrolytic solution.
Claim 7
Dependent Claim
34 words
The invention defined in claim 5, wherein said means for cooling said electrolytic solution includes conduit means in said separate vessel for conducting a cooling medium in heat exchanging relationship through said electrolytic solution.
Claim 8
Dependent Claim
30 words
The invention defined in claim 1, wherein said electrode system includes at least one electrode element in direct contact with said sample solution in one position of said container means.
Claim 9
Dependent Claim
12 words
The invention defined in claim 7, wherein said electrode element comprises palladium.
Claim 10
Dependent Claim
12 words
The invention defined in claim 7, wherein said electrode element comprises silver.
Claim 11
Dependent Claim
12 words
The invention defined in claim 7 wherein said electrode element comprises lead.
Claim 12
Dependent Claim
12 words
The invention defined in claim 7 wherein said electrode element comprises mercury.
Claim 13
Dependent Claim
53 words
The invention defined in claim 11 wherein said mercury electrode element is disposed at the bottom of said focusing chamber on a respective one of said two pairs of oppositely disposed walls in either of said first and second positions of the container means, said means also including means for cooling said mercury.
Claim 14
Dependent Claim
38 words
The invention defined in claim 7, wherein at least one wall of at least one of said two pairs of walls includes a flat electrode extending over the entire area of the inner surface of said one wall.
Claim 15
Dependent Claim
43 words
The invention defined in claim 13 wherein said closed container means includes a removable section, the inner surface of said section defining said one wall, and means for detachably connecting said section in fluid tight engagement with the remainder of the container means.
Claim 16
Dependent Claim
26 words
The invention defined in claim 14 wherein said closed container means also includes at least one cooling chamber in heat exchanging relationship with said sample solution.
Claim 17
Dependent Claim
61 words
The invention defined in claim 1 wherein said closed container means comprises two focusing chambers in communication with each other, and valve means for confining said sample solution in one of said focusing chambers while in said one position and for transferring the sample solution to the other of said focusing chambers when the container means is in said second position.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |