US3733909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for injecting a sample into a gas chromatograph
Assignee: Individual
•
Filing: 1972-03-10
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Granted: 1973-05-22
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Expires: 1992-03-10
Abstract
Abstract An apparatus for injecting a sample into a gas chromatograph, has a sample evaporation chamber, wherein there is reciprocably received a sample-injecting pipette in the form of a needle with an internal longitudinal capillary passage for accommodation of a sample, having an inlet and an outlet. The inlet of the passage is made through the external side wall of the needle. The sample evaporation chamber is hermetically sealed from the ambient atmosphere with the help of sealing means; it communicates with the supply source of the carrier gas of the gas chromatograph and with the chromatographic column of this chromatograph. The sample evaporation chamber incorporates a member for guiding the carrier gas into the capillary passage of the needle. The sealing means includes a septum made of an elastic material and a sleeve. The septum is received at an end portion of the sample evaporation chamber, where the needle is introduced, whereas the sleeve envelopes the external surface of the needle. The needle is made of a material which can pierce the septum, as a sample is being injected into the sample evaporation chamber.
Inventors
- 👤 J Nikolaevich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:55
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/04; G01N30/06; G01N30/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
315 words
An apparatus for injecting a sample into a gas chromatograph having a chromatographic column and using a carrier gas, including: a chamber for evaporation of said sample, communicating witH and having a supply source of a carrier gas of said gas chromatograph, said chamber being connected with the chromatographic column of said gas chromatograph; a sampleinjecting pipette arranged for reciprocation within said sample evaporation chamber, said pipette being disposed adjacent to one end of the chamber, said pipette being in the form of a needle provided with means enabling reciprocatory longitudinal motion thereof; an axial internal capillary passage of said needle provided to accommodate said sample thereinside, said passage having an inlet and an outlet, said inlet being formed through an external side wall of said needle; a guide member positioned interiorly of said sample evaporation chamber for guiding said carrier gas into the inlet of said capillary passage of said needle; sealing means hermetically sealing said sample evaporation chamber from ambient atmosphere; a septum member of said sealing means, said septum member being made from an elastic material and being mounted in the end portion of said sample evaporation chamber, on the side thereof where said needle is to be inserted and positioned thereinside; a sleeve member forming part of said sealing means and enveloping the external side wall of said needle; said needle being made of a material which can pierce said septum member as said sample is being injected into said sample evaporation chamber, said sleeve enveloping said external side wall of said needle so that during reciprocation of said needle the slleve closes said inlet of said capillary passage of said needle, and, when the needle is passing through said septum member, said sleeve member engages said septum member, said inlet of the needle emerges from said sleeve member towards the guide member, said sleeve member ensuring sealing of said apparatus.
Claim 2
Independent Claim
315 words
An apparatus for injecting a sample into a gas chromatograph having a chromatographic column and using a carrier gas, including: a chamber for evaporation of said sample, communicating witH and having a supply source of a carrier gas of said gas chromatograph, said chamber being connected with the chromatographic column of said gas chromatograph; a sampleinjecting pipette arranged for reciprocation within said sample evaporation chamber, said pipette being disposed adjacent to one end of the chamber, said pipette being in the form of a needle provided with means enabling reciprocatory longitudinal motion thereof; an axial internal capillary passage of said needle provided to accommodate said sample thereinside, said passage having an inlet and an outlet, said inlet being formed through an external side wall of said needle; a guide member positioned interiorly of said sample evaporation chamber for guiding said carrier gas into the inlet of said capillary passage of said needle; sealing means hermetically sealing said sample evaporation chamber from ambient atmosphere; a septum member of said sealing means, said septum member being made from an elastic material and being mounted in the end portion of said sample evaporation chamber, on the side thereof where said needle is to be inserted and positioned thereinside; a sleeve member forming part of said sealing means and enveloping the external side wall of said needle; said needle being made of a material which can pierce said septum member as said sample is being injected into said sample evaporation chamber, said sleeve enveloping said external side wall of said needle so that during reciprocation of said needle the slleve closes said inlet of said capillary passage of said needle, and, when the needle is passing through said septum member, said sleeve member engages said septum member, said inlet of the needle emerges from said sleeve member towards the guide member, said sleeve member ensuring sealing of said apparatus.
Claim 3
Dependent Claim
112 words
An apparatus according to claim 1, wherein said member for guiding said carrier gas into said capillary passage of said needle includes a tube arranged within said sample evaporation chamber, so that there is formed an annular capillary space intermediate of the external surface of said needle and the internal wall of said tube, one end of said tube being mounted adjacent to said chromatographic column thereby establishing communication between the internal space of said tube with said chromatographic column, the opposite end of said tube facing said septum member, said inlet of said capillary passage of said needle being positioned above said opposite end of said tube, facing said septum member.
Claim 4
Dependent Claim
78 words
An apparatus according to claim 1, wherein said member for guiding said carrier gas into said capillary passage of said needle includes an annular shoulder arranged within said sample evaporation chamber, so that said inlet of said capillary passage of said needle is positioned above said annular shoulder, said outlet of said capillary passage being positioned beneath said shoulder, there being formed an annular capillary space intermediate of the external surface of said needle and said annular shoulder.
Claim 5
Dependent Claim
21 words
An apparatus according to claim 3, wherein said annular shoulder is formed on the internal wall of said sample evaporation chamber.
Claim 6
Dependent Claim
50 words
An apparatus according to claim 3, wherein there is mounted interiorly of said sample evaporation chamber and coaxially therewith a tubular member communicating with said chromatographic column, one end of said tubular member facing said septum member, said annular shoulder being formed on the internal wall of said tubular member.
Claim 7
Dependent Claim
22 words
An apparatus according to claim 5, wherein said tubular member is an integral part of said chromatographic column of said gas chromatograph.
Claim 8
Dependent Claim
45 words
An apparatus according to claim 1, wherein said needle is associated with a holder assembly including a housing having reciprocably mounted therein a rod connected with said needle, said sleeve being mounted at the end portion of said housing, adjacent to said needle projecting therefrom.
Claim 9
Dependent Claim
33 words
An apparatus according to claim 1 wherein said outlet of said capillary paSsage of said needle is made through an external side wall of said needle, beneath said inlet of said capillary passage.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |