US4484483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Needle assembly useful in the head-space method of gas chromatography
Assignee: PE Manufacturing GmbH
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Filing: 1982-03-03
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Granted: 1984-11-27
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Expires: 2002-03-03
Abstract
Abstract A needle assembly for feeding a carrier gas into a sample vessel during the head-space analysis of a sample includes a lateral outlet passage for conveying the gas.
Inventors
- 👤 Wolfgang Riegger
- 👤 Wolfgang Chlosta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:56
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/04; G01N30/16; G01N30/18; G01N1/00; G01N1/02; G01N1/22; G01N1/2226; G01N2001/2229
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
116 words
A needle assembly for feeding a carrier gas into the head space of a sample vessel sealed by a diaphragm, said assembly comprising: a hollow needle affixed to an analytical instrument, said needle having a lateral exit aperture at the lower end thereof; a housing movable with respect to said needle, said housing including a bore therethrough for guiding said needle, said bore branching into a lateral outlet passage, said passage communicating with said lateral exit aperture in said needle, when said housing is in a first position, said passage opening to the atmosphere through a restrictor, whereby when said housing is in a second position said communication between said bore and said passage is prevented.
Claim 2
Dependent Claim
116 words
A needle assembly for feeding a carrier gas into the head space of a sample vessel sealed by a diaphragm, said assembly comprising: a hollow needle affixed to an analytical instrument, said needle having a lateral exit aperture at the lower end thereof; a housing movable with respect to said needle, said housing including a bore therethrough for guiding said needle, said bore branching into a lateral outlet passage, said passage communicating with said lateral exit aperture in said needle, when said housing is in a first position, said passage opening to the atmosphere through a restrictor, whereby when said housing is in a second position said communication between said bore and said passage is prevented.
Claim 3
Dependent Claim
44 words
Needle assembly as claimed in claim 1, further comprising: at least two spaced apart sealing rings positioned along said needle, said sealing rings forming a seal between said needle and housing bore, said rings being spaced such that said outlet passage is located therebetween.
Claim 4
Dependent Claim
15 words
Needle assembly as claimed in claim 2 wherein: said sealing rings are formed by O-rings.
Claim 5
Dependent Claim
15 words
Needle assembly as claimed in claim 1 wherein said restrictor includes an adjustable needle valve.
Claim 6
Dependent Claim
28 words
Needle assembly as claimed in claim 1 wherein: said needle includes a circumferential groove; and said lateral exit aperture is provided at the bottom of said circumferential groove.
Claim 7
Dependent Claim
27 words
Needle assembly as claimed in claim 5, wherein: the lateral walls of said circumferential groove are tapered such that said circumferential groove becomes wider towards the outside.
Claim 8
Dependent Claim
18 words
Needle assembly as claimed in claim 6 wherein: the edges of said circumferential groove are rounded and polished.
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) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |