US4849179A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for taking samples by thermal desorption
Assignee: GKSS Forshungszentrum Geesthacht GmbH
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Filing: 1987-05-14
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Granted: 1989-07-18
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Expires: 2007-05-14
Abstract
Abstract An apparatus for taking samples by thermal desorption of compounds that are adsorbed on solid adsorbents contained in a sample tube. An injector has a recess for accommodating the sample tube and a connection for a capillary column of a gas chromatograph. The compounds are desorbed into such capillary column by means of a stream of carrier gas passing through the sample tube. An injector extension is fastened to the injector and has a recess for accommodating the sample tube. The recess of the injector extension is flush with the recess of the injector. A push rod is guidable in the injector extension for pushing the sample tube from a position in the injector extension into a position within the injector. A carrier gas inlet communicates with the recess in the injector extension for admitting a carrier gas therein. A plug is disposed at an end of the push rod for gripping the sample tube. The plug includes a bore for effecting communication between the carrier gas inlet and the interior of the sample tube.
Inventors
- 👤 Karl H. Reinhardt
- 👤 Helmut Dittmer
- 👤 Jurgen Gandress
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:45
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/04; G01N30/06; G01N30/08; G01N30/12; G01N2030/126; G01N2030/128
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
202 words
An apparatus for taking samples by thermal desorption of compounds that are adsorbed on solid adsorbents, the apparatus including: a sample tube containing solid adsorbents; and an injector having a recess for accommodating the sample tube and having a connection for a capillary column of a gas chromatograph, compounds being desorbed into such capillary column by means of a stream of carrier gas passing through the sample tube; the improvement comprising: an injector extension fastened to said injector and having a recess for accommodating the sample tube, the recess of said injector extension being flush with the recess of said injector; a push rod guidable in said injector extension for pushing said sample tube from a first position in said injector extension into a second position within said injector; carrier gas inlet means communicating with the recess in said injector extension for admitting a carrier gas therein; and a plug disposed at an end of said push rod adjacent to said sample tube for gripping said sample tube, said plug including a bore for effecting communication between said carrier gas inlet means and the interior of said sample tube when said push rod has moved said sample tube into said injector recess.
Claim 2
Independent Claim
202 words
An apparatus for taking samples by thermal desorption of compounds that are adsorbed on solid adsorbents, the apparatus including: a sample tube containing solid adsorbents; and an injector having a recess for accommodating the sample tube and having a connection for a capillary column of a gas chromatograph, compounds being desorbed into such capillary column by means of a stream of carrier gas passing through the sample tube; the improvement comprising: an injector extension fastened to said injector and having a recess for accommodating the sample tube, the recess of said injector extension being flush with the recess of said injector; a push rod guidable in said injector extension for pushing said sample tube from a first position in said injector extension into a second position within said injector; carrier gas inlet means communicating with the recess in said injector extension for admitting a carrier gas therein; and a plug disposed at an end of said push rod adjacent to said sample tube for gripping said sample tube, said plug including a bore for effecting communication between said carrier gas inlet means and the interior of said sample tube when said push rod has moved said sample tube into said injector recess.
Claim 3
Dependent Claim
57 words
Apparatus as defined in claim 1, wherein said push rod has a tapered region having an outer surface adjacent said plug; said plug has a frontal face facing the interior of said sample tube; and said bore extends from the frontal face of said plug to said outer surface of said push rod in said tapered region.
Claim 4
Dependent Claim
39 words
Apparatus as defined in claim 1, wherein said injector extension has a free frontal face and further including means for sealing the recess in said injector extension against said push rod and the environment near said free frontal face.
Claim 5
Dependent Claim
20 words
Apparatus as defined in claim 1, including means defining a threaded coupling for joining said injector extension with said injector.
Claim 6
Dependent Claim
21 words
Apparatus as defined in claim 1, wherein said carrier gas inlet means is disposed at a side of said injector extension.
Claim 7
Dependent Claim
35 words
Apparatus as defined in claim 1, including a guide sleeve fitted in the recess of said injector at the end of said injector adjacent said injector extension for guiding said plug in a sealing manner.
Claim 8
Dependent Claim
27 words
Apparatus as defined in claim 1, wherein said sample tube has a frontal face with means defining an opening, and said plug is inserted into said opening.
Claim 9
Dependent Claim
28 words
Apparatus as defined in claim 1, including means for insing recesses and said sample tube with a carrier gas when said sample tube is in said second position.
References Cited (Backward Citations)
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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) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |