US4464940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sampler for a gas chromatograph
Assignee: PE Manufacturing GmbH
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Filing: 1982-07-12
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Granted: 1984-08-14
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Expires: 2002-07-12
Abstract
Abstract According to the head space method, samples are supplied from sealed sample vessels by means of a needle. A change-over valve, an optionally higher or reduced carrier gas pressure is applied to a carrier gas conduit comprising a shut-off valve and terminating between the needle and entrance of the separating column. This enables a defined sample feeding and analysis by an optimum carrier gas pressure even with volatile samples.
Inventors
- 👤 Peter Pospisil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:52
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/04; G01N30/24
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
152 words
A head space sampler for a gas chromatograph, said sampler comprising: a needle connected to the entrance of a gas chromatographic separating column by means of a connecting passage; a carrier gas conduit terminating at said connecting passage between said needle and said separating column; means for generating a first higher carrier gas pressure at a first carrier gas connection; means for generating a second carrier gas pressure, which pressure is comparatively lower that said said first pressure, at a second carrier gas connection; a change-over valve, said change-over valve having said first and second carrier gas connection as inputs and said carrier gas conduit as an output; a controllable shut-off valve disposed in said carrier gas conduit between said change-over valve and said termination of said carrier gas conduit at said connecting passage; and means for piercing said needle through a septum of a sample vessel into the head space thereof.
Claim 2
Dependent Claim
152 words
A head space sampler for a gas chromatograph, said sampler comprising: a needle connected to the entrance of a gas chromatographic separating column by means of a connecting passage; a carrier gas conduit terminating at said connecting passage between said needle and said separating column; means for generating a first higher carrier gas pressure at a first carrier gas connection; means for generating a second carrier gas pressure, which pressure is comparatively lower that said said first pressure, at a second carrier gas connection; a change-over valve, said change-over valve having said first and second carrier gas connection as inputs and said carrier gas conduit as an output; a controllable shut-off valve disposed in said carrier gas conduit between said change-over valve and said termination of said carrier gas conduit at said connecting passage; and means for piercing said needle through a septum of a sample vessel into the head space thereof.
Claim 3
Dependent Claim
18 words
Sampler as claimed in claim 1 wherein said change-over valve and said controllable shut-off valve are solenoid valves.
References Cited (Backward Citations)
US3668834A
Cited
US4237733A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |