US4522715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High performance chromatography column
Assignee: Iowa State University Research Foundation Inc
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Filing: 1984-08-14
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Granted: 1985-06-11
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Expires: 2004-08-14
Abstract
Abstract A chromatography column adapted to be used in high performance liquid chromatography which includes an elongated tubular hollow column of rigid material which is enclosed by an outer tubular sleeve. End fittings are removably attachable to opposite ends of the outer tubular sleeve and have longitudinal passageways extending through their length, said passageways terminating in an enlarged bore at their innermost ends wherein ring means are insertable. Opposite ends of the column are also insertable into the enlarged bores of the end fittings. The end fittings are adjustably securable to opposite ends of the sleeve so that opposite ends of the column are brought into secure and sealing abutment with the ring means which in turn are sandwiched against the end fittings. A passageway for the circulation of fluids is thus formed through the end fitting ring means and column and tubular means can be sealingly secured to the longitudinal passageways at the outer ends of the end fittings to integrate the chromatography column with a high performance liquid chromatography system.
Inventors
- 👤 Rodney R. Walters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:35
CPC Classifications
B; B01; B01D; B01D15/00; B01D15/08; B01D15/10; B01D15/22; G; G01; G01N; G01N30/00; G01N30/02; G01N30/60; G01N30/6004; G01N30/6026; G01N30/6034
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
174 words
A chromatography column adapted to be used in high performance liquid chromatography comprising: (a) an elongated hollow tubular column of rigid material having opposite ends, said column being of generally uniform cylindrical shape free of any permanently affixed threads or fittings; (b) a pair of oppositely disposed end fittings each having inner and outer ends and each having elongated longitudinal passageways; (c) the longitudinal passageways of said fittings each terminating in an enlarged bore at the respective inner ends thereof; (d) a first ring means in said enlarged bores; (e) the opposite ends of said column being positioned within said bores in abutting relation to said first ring means; (f) an outer tubular sleeve positioned longitudinally around said column; and (g) means for securing said end fittings to opposite ends of said sleeve so that said column and first ring means are axially compressed between said pair of secured end fittings with said first ring means being kept in a sealing compressed relationship between said end fittings and said opposite ends of said column.
Claim 2
Dependent Claim
174 words
A chromatography column adapted to be used in high performance liquid chromatography comprising: (a) an elongated hollow tubular column of rigid material having opposite ends, said column being of generally uniform cylindrical shape free of any permanently affixed threads or fittings; (b) a pair of oppositely disposed end fittings each having inner and outer ends and each having elongated longitudinal passageways; (c) the longitudinal passageways of said fittings each terminating in an enlarged bore at the respective inner ends thereof; (d) a first ring means in said enlarged bores; (e) the opposite ends of said column being positioned within said bores in abutting relation to said first ring means; (f) an outer tubular sleeve positioned longitudinally around said column; and (g) means for securing said end fittings to opposite ends of said sleeve so that said column and first ring means are axially compressed between said pair of secured end fittings with said first ring means being kept in a sealing compressed relationship between said end fittings and said opposite ends of said column.
Claim 3
Dependent Claim
47 words
The device of claim 1 wherein said end fittings are cylindrical and have external threads imposed on the outer surface and said tubular sleeve has internal threads imposed on its inner surface so that said end fittings are removably threadable into opposite ends of said sleeve member.
Claim 4
Dependent Claim
39 words
The device of claim 2 wherein said outer ends of said end fittings comprise nut elements so that said end fittings can be threaded into said sleeve element by grasping and turning said nut elements with a wrench means.
Claim 5
Dependent Claim
59 words
The device of claim 1 wherein said end fittings have internal threads imposed upon the inside of said longitudinal passageways at said outer ends so as to be threadably mateable with threaded male ends of threaded nut fittings which are positioned at the ends of tubes connected said column in fluid communication with a high performance liquid chromatography system.
Claim 6
Dependent Claim
16 words
The device of claim 1 wherein said first ring means comprises a fluorocarbon-encased stainless steel frit.
Claim 7
Dependent Claim
14 words
The device of claim 1 wherein said outer tubular sleeve is made of brass.
Claim 8
Dependent Claim
14 words
The device of claim 1 wherein said tubular column is made of stainless steel.
Claim 9
Dependent Claim
88 words
The device of claim 1 wherein a second ring means is retentatively held in a radial slot in said enlarged bore of one of said end fittings, said second ring means being of a resilient material having an inside diameter which resiliently allows said tubular column to pass through and abut said first ring means but retentively holds said tubular column so that upon disengagement of the opposite said end fitting, said tubular column remains in an abutting relationship with said first ring means in said end fitting.
Claim 10
Dependent Claim
18 words
The device of claim 1 wherein said longitudinal passageways of said end fittings have various diameter bore sections.
Claim 11
Dependent Claim
55 words
The device of claim 1 further comprising tubular members sealingly attached to apertures in the side walls of said tubular sleeve, said tubular members being in fluid communication at one end with the interior space of said sleeve member between said sleeve member and said tubular column and at the other end with a liquid.
Claim 12
Dependent Claim
49 words
The device of claim 1 wherein said end fittings further comprise channels on opposite sides of said longitudinal passageways at said outer ends and extend inwardly toward said inner ends along said longitudinal passageways such a distance so as to allow tweezer means to remove said first ring means.
Claim 13
Dependent Claim
63 words
The device of claim 8 wherein said end fitting having said radial slot further comprises channels on opposite sides of and extending inwardly along said longitudinal passageways from said outer end of said end fitting such a distance so as to allow tweezer means to be inserted in said channels to remove said first ring means or said second ring means or both.
Claim 14
Dependent Claim
68 words
The device of claim 3 wherein the length of said tubular sleeve is such that said fittings can be in tight abutting engagement with said first ring means to seal said first ring means against the ends of said column without said nuts engaging the ends of said tubular sleeve, said end fittings and said tubular sleeve being free from any sealing means therebetween except for said threads.
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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) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |