Patent US4854952A successfully refreshed from Google Patents.
US4854952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromatography apparatus
Assignee: US Philips Corp
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Filing: 1988-08-03
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Granted: 1989-08-08
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Expires: 2008-08-03
Abstract
Abstract A thermal insulation liner is provided for a chromatograph oven. The liner is moulded as a single bucket-shaped component 1 from ceramic fibers, typically alumino-silicate, bound together with an inorganic binder. The heat capacity and thermal conductivity of this material are both very low. The inner layer of the oven can be rapidly cooled for fast throughput of analyses and there is low risk of hand burns when changing chromatograph columns. The inner surface is mouled as a smooth shape, assisting the flow of circulated air and thereby reducing hot spots. Thermal insulation for the injector and detector of the chromatograph are also mouled in together with entry holes and mounting points 3,4, 5,6 to enable an inexpensive, easily assembled oven and chromatograph to be produced.
Inventors
- 👤 Andrew T. Stepien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:19
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/28; G01N30/30; G01N2030/3084
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
51 words
A chromatography oven thermal insulation liner characterised in that the liner is formed by ceramic fibres bound together with an inorganic binder moulded into a one piece component to enclose an oven cavity, the one piece component having an end wall and side walls and being open opposite the end wall.
Claim 2
Dependent Claim
51 words
A chromatography oven thermal insulation liner characterised in that the liner is formed by ceramic fibres bound together with an inorganic binder moulded into a one piece component to enclose an oven cavity, the one piece component having an end wall and side walls and being open opposite the end wall.
Claim 3
Dependent Claim
13 words
A liner as claimed in claim 1, in which the fibres are alumino-silicate.
Claim 4
Dependent Claim
75 words
A liner as claimed in claim 1, in which the inner surface of the end wall is concave and smoothly curved and merges smoothly with the inside surfaces of the side walls, the end wall having a hole to receive a drive shaft of an air circulating fan to be mounted inside the oven, the concave surface being shaped to guide air flowing radially away from the fan and direct it along the side walls.
Claim 5
Dependent Claim
30 words
A liner as claimed in claim 1, in which mounting points are provided on the inner surface of the liner by moulding them integrally with the walls of the liner.
Claim 6
Dependent Claim
13 words
A liner as claimed in claim 1 arranged to house a chromatograph column.
Claim 7
Dependent Claim
33 words
A liner as claimed in claim 5, in which apertures to allow coupling between a chromatograph injector and/or detector and the chromatograph column are moulded integrally with the side walls of the liner.
Claim 8
Dependent Claim
41 words
A liner as claimed in claim 6, in which the outer surface of side walls are provided with thermally insulating projections through which the apertures pass, the projections being of the same material and being moulded integrally with the side walls.
Claim 9
Dependent Claim
32 words
A liner as claimed in claim 1, in which a flange is formed on the free end on the side walls to present a flat bearing surface around the oven cavity opening.
Claim 10
Dependent Claim
15 words
A chromatography oven liner as claimed in claim 1, arranged to housed a sample injector.
Claim 11
Dependent Claim
13 words
A chromatography oven liner as claimed claim 1, arranged to house a detector.
Claim 12
Dependent Claim
43 words
A chromatography oven liner as claimed in claim 1, having a plurality of compartments each compartment housing one of a chromatography column, a chromatography sample injector and a chromatography detector, being substantially thermally isolated from one another, and being moulded in one piece.
Claim 13
Dependent Claim
28 words
A method of manufacturing a chromatography oven liner as claimed in claim 1, comprising moulding a one piece component from ceramic fibres bound together with an inorganic binder.
Claim 14
Dependent Claim
16 words
A chromatography oven characterised in that the oven comprises a liner as claimed in claim 1.
Claim 15
Dependent Claim
34 words
A chromatography oven as claimed in claim 13, having a door closing the oven cavity in which the door is lined with the same material as that from which the oven liner is formed.
Claim 16
Dependent Claim
23 words
A gas chromatograph comprising a gas chromatography column mounted within an oven as claimed in claim 13, a sample injector and a detector.
Claim 17
Dependent Claim
20 words
A gas chromatograph as claimed in claim 15 in which the sample injector and/or detector is/are mounted on the oven.
Claim 18
Dependent Claim
45 words
A gas chromatograph as claimed in claim 16, in which the connection between the sample injector and the columns and/or the connection between the detector and the column passes through apertures in thermally insulating projections moulded integrally with the side walls of the oven liner.
Claim 19
Dependent Claim
45 words
A gas chromatograph as claimed in claim 17, in which the oven liner has a plurality of compartments, each compartment housing one of the chromatography column, the sample injector and the detector, being substantially thermally isolated from one another, and being moulded in one piece.
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) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |