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US4820044A Expired / Lapsed US ⏱️ 0.0 years remaining

Transport detector system

Assignee: BP PLC
•
Filing: 1987-11-12
•
Granted: 1989-04-11
•
Expires: 2007-11-12
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Abstract

Abstract A transport detector system comprises (a) a liquid delivery tube, (b) a plurality of moveable spokes, the spokes being positioned to pass in sequence under the delivery tube, the spokes being constructed from a refractory inorganic material of low thermal conductivity, (c) one or more evaporators, positioned so that the spokes pass sequentially through it or them after liquid has been deposited on the spokes, (d) a detector positioned so that the spokes pass sequentially through it after passage through the evaporator(s), (e) one or more coolers, positioned so that the spokes pass through it or them after passage through the detector, (f) a stepper motor adapted to move the spokes in a series of discrete steps, and (g) a control system for the stepper motor, evaporators and coolers. The system is particularly suitable for use in HPLC analysis and may be interfaced with a plasma spectrometer.

Inventors

  • 👤 James S. Crighton
  • 👤 David J. Malcolme-Lawes

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 19:16
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/62; G01N30/64; G01N30/68; G01N30/88; G01N30/84; G01N2030/8411; G01N2030/8417; G01N2030/8809; G01N2030/884; G01N2030/8854

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 129 words
A transport detector system comprising (a) means for supplying liquid, (b) a plurality of moveable spokes, the spokes being positioned to pass in sequence across the liquid supply means whereby liquid is deposited on the spokes, the spokes being constructed from a refractory inorganic material of low thermal conductivity, (c) one or more evaporators, positioned so that the spokes pass sequentially through it or them after liquid has been deposited on the spokes, (d) a detector positioned so that the spokes pass sequentially through it after passage through said one or more evaporators, (e) one or more coolers, positioned so that the spokes pass through it or them after passage through the detector, and (f) a stepper motor adapted to move the spokes in a series of discrete steps.
Claim 2
Dependent Claim 129 words
A transport detector system comprising (a) means for supplying liquid, (b) a plurality of moveable spokes, the spokes being positioned to pass in sequence across the liquid supply means whereby liquid is deposited on the spokes, the spokes being constructed from a refractory inorganic material of low thermal conductivity, (c) one or more evaporators, positioned so that the spokes pass sequentially through it or them after liquid has been deposited on the spokes, (d) a detector positioned so that the spokes pass sequentially through it after passage through said one or more evaporators, (e) one or more coolers, positioned so that the spokes pass through it or them after passage through the detector, and (f) a stepper motor adapted to move the spokes in a series of discrete steps.
Claim 3
Dependent Claim 14 words
A system according to claim 1 wherein the detector is a flame ionization detector.
Claim 4
Dependent Claim 31 words
A transport detector system according to claim 1 wherein the detector is a hydrogen flame, and further comprising (h) a plasma spectrometer adapted to receive combustion products from the hydrogen flame.
Claim 5
Dependent Claim 20 words
A system according to claim 1 comprising an evaporator located at the point where eluate is delivered to a spoke.
Claim 6
Dependent Claim 12 words
A system according to claim 1 wherein the spokes are silica rods.
Claim 7
Dependent Claim 21 words
A system according to claim 1 wherein the spokes project radially outwards from a circular hub driven by the stepper motor.
Claim 8
Dependent Claim 13 words
A system according to claim 1 wherein the evaporators are hot air blowers.
Claim 9
Dependent Claim 12 words
A system according to claim 1 wherein the coolers are air fans.

References Cited (Backward Citations)

US3376694A Cited
US3744973A Cited
US3788479A Cited
DE2424985A1 Cited
US4215090A Cited
US4271022A Cited
US4562044A Cited
EP0136610A2 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-04-10 1992-10-10 1993-04-11 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-04-10 1996-10-10 1997-04-11 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-04-10 2000-10-10 2001-04-11 $7700.00 Window Closed / Lapsed

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