US4580440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of detecting a contraband substance
Assignee: Nordion Inc
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Filing: 1984-07-17
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Granted: 1986-04-08
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Expires: 2004-07-17
Abstract
Abstract A method of detecting contraband substances in freight cargo containers in which the container is agitated to disturb particulates therein, and air containing such particulates is then sampled and the particulates collected. The collected particulates include naturally occurring particulates which have absorbed vapors of the contraband substance during the entire time that the container has been closed, and also include particulates of the contraband substance itself. The collected particulates are heated to drive off vapors indicative of the contraband substance and the vapors are analyzed in a mass analyzer.
Inventors
- 👤 Neil M. Reid
- 👤 William R. Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:58
CPC Classifications
G; G01; G01V; G01V9/00; G01V9/007; G01N; G01N1/00; G01N1/02; G01N2001/022; G01N2001/025; G01N1/28; G01N1/2813; G01N2001/2833
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
140 words
A method of detecting a substance in a container, said substance being of the kind which emits particulates or which emits vapors that can be retained by non-volatile particulates, said method comprising the steps of: (1) ensuring that said container has been agitated substantially immediately before step (2) below to cause at least some of the particulates present within said container to become airborne within said container, (2) sucking air containing said airborne particulates from said container into a collector without vacuuming any surfaces in said container, and collecting at least some of said particulates in said air, such collection being without heating said particulates sufficiently to release vapor of said substance therefrom, (3) then after collecting said particulates, rapidly heating said collected particulates sufficiently to release vapor of said substance therefrom, and (4) analyzing said vapor for said substance.
Claim 2
Independent Claim
140 words
A method of detecting a substance in a container, said substance being of the kind which emits particulates or which emits vapors that can be retained by non-volatile particulates, said method comprising the steps of: (1) ensuring that said container has been agitated substantially immediately before step (2) below to cause at least some of the particulates present within said container to become airborne within said container, (2) sucking air containing said airborne particulates from said container into a collector without vacuuming any surfaces in said container, and collecting at least some of said particulates in said air, such collection being without heating said particulates sufficiently to release vapor of said substance therefrom, (3) then after collecting said particulates, rapidly heating said collected particulates sufficiently to release vapor of said substance therefrom, and (4) analyzing said vapor for said substance.
Claim 3
Dependent Claim
14 words
A method according to claim 1 wherein said container is a freight cargo container.
Claim 4
Dependent Claim
20 words
A method according to claim 2 wherein said agitation is carried out by directing an air jet into said container.
Claim 5
Dependent Claim
41 words
A method according to claim 3 wherein said step of sucking air from said container is performed by introducing a sampling line into said container and wherein said agitation step is performed by blowing said air jet through said sampling line.
Claim 6
Dependent Claim
46 words
A method according to claim 2 wherein said step of sucking said air is performed by introducing a sampling line having a number of tentacles at its end into said container so that air is sucked from a number of different directions into said sampling line.
Claim 7
Dependent Claim
29 words
A method according to claim 2 wherein said container is carried on a conveyor into a high energy x-ray examination facility and said agitation is performed by said conveyor.
Claim 8
Dependent Claim
19 words
A method according to claim 1 wherein said agitation is performed by dropping said container through a short distance.
Claim 9
Dependent Claim
20 words
A method according to claim 1 wherein said agitation is carried out by connecting a vibration transducer to said container.
Claim 10
Dependent Claim
13 words
A method according to claim 8 wherein said transducer is an ultrasonic transducer.
Claim 11
Dependent Claim
24 words
A method according to claim 1 wherein said agitation step is performed by agitating said container on a conveyor which simultaneously transports said container.
Claim 12
Dependent Claim
32 words
A method according to claim 1 wherein said container has a door at one end and wherein said step of sucking air is performed at a location remote from said one end.
Claim 13
Dependent Claim
33 words
A method according to claim 1 wherein air is blown into said container at one location and said step of sucking said air is performed at a location remote from said one location.
Claim 14
Dependent Claim
31 words
A method according to claim 1 wherein said collection step includes the step of directing air from said container over a sticky collector surface to trap said particulates on said surface.
Claim 15
Dependent Claim
19 words
A method according to claim 13 wherein said step of heating includes the step of heating said collector surface.
Claim 16
Dependent Claim
12 words
A method according to claim 1 wherein said contraband substance is heroin.
Claim 17
Dependent Claim
12 words
A method according to claim 1 wherein said contraband substance is cocaine.
Claim 18
Dependent Claim
12 words
A method according to claim 1 wherein said contraband substance is cannabis.
Claim 19
Dependent Claim
14 words
A method according to claim 1 wherein said contraband substance is an explosive substance.
Claim 20
Dependent Claim
91 words
A method according to claim 1 wherein said step (4) is performed by flowing said desorbed vapor together with a carrier gas into an ionizing chamber, forming ions from said desorbed vapor, conducting said ions through a first orifice and through a gas curtain and through a second orifice into a vacuum chamber containing a mass analyzer, and causing said gas curtain to effuse from said first orifice countercurrent to the flow of said ions to prevent particulates entrained in said desorbed vapor and said carrier gas from clogging said orifice.
Claim 21
Dependent Claim
129 words
Apparatus for detecting a substance in a freight container, said substance being of the kind with emits particulates or which emits vapors that can be retained by non-volatile particulates, said apparatus comprising: (1) collection means for collecting particulates, (2) suction means for sucking air, and airborne particulates in said air, from the volume of air within said container into said collection means to collect at least some of said airborne particulates from said container in said collection means, (3) means operable after collection of said airborne particulates for rapidly heating said collected particulates sufficiently to release vapors of said substance therefrom, (4) analyzer means for analyzing said vapors, (5) and means for conveying vapors released from said particulates from said collection means into said analyzer means for analysis thereof.
Claim 22
Dependent Claim
129 words
Apparatus for detecting a substance in a freight container, said substance being of the kind with emits particulates or which emits vapors that can be retained by non-volatile particulates, said apparatus comprising: (1) collection means for collecting particulates, (2) suction means for sucking air, and airborne particulates in said air, from the volume of air within said container into said collection means to collect at least some of said airborne particulates from said container in said collection means, (3) means operable after collection of said airborne particulates for rapidly heating said collected particulates sufficiently to release vapors of said substance therefrom, (4) analyzer means for analyzing said vapors, (5) and means for conveying vapors released from said particulates from said collection means into said analyzer means for analysis thereof.
Claim 23
Dependent Claim
24 words
Apparatus according to claim 20 and including means for agitating said container to increase the number of particulates which are airborne within said container.
Claim 24
Dependent Claim
73 words
Apparatus according to claim 21 wherein said suction means includes a long air line having essentially no bends having a radius less than about five times the internal diameter of the line, and having no increases in the internal diameter therein at a rate greater than about a 7 degree half angle cone, and having an internal surface roughness which does not exceed about 1 percent of the internal diameter of the line.
Claim 25
Dependent Claim
16 words
Apparatus according to claim 22 wherein said line is at least about 10 meters in length.
References Cited (Backward Citations)
GB1360317A
Cited
US3748905A
Cited
US3942357A
Cited
US3998101A
Cited
GB1497436A
Cited
US4045997A
Cited
US4202200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |