US4778764A
Expired / Lapsed
US
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Detection system and method
Assignee: Thermo Fisher Scientific Inc
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Filing: 1974-10-07
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Granted: 1988-10-18
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Expires: 1994-10-07
Abstract
Abstract A detection system for detecting the presence of predetermined compounds in a sample. The system comprises a sample injection means, a chromatographic column, a conversion means and one or more specific gas detectors. The conversion means transforms the column effluent to combustion products in the gas phase, after which those combustion products are transferred to the specific gas detectors. In one embodiment for detecting nitrogen compounds, the conversion means includes an oxygen-rich flame, a means to control the flame to have a temperature in the range 600°-1700° C., means to inject the column effluent into the flame, and an output port for transferring the flame effluent to a specific nitrogen detector.
Inventors
- 👤 David H. Fine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:33
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/12; G01N30/00; G01N30/02; G01N30/84; G01N2030/022; G01N2030/025; G01N2030/8405; Y; Y10; Y10T; Y10T436/00; Y10T436/17; Y10T436/176152; Y10T436/177692; Y10T436/18; Y10T436/186; Y10T436/19
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
136 words
A chromatographic detection system comprising, in combination: A. a gas chromatograph having a chromatograph output port, B. a nitric oxide (NO) gas detector having a detector input port, means for reacting combustion products with ozone (O 3 ), and means for detecting light having wavelength in the range 0.6-2.8 microns, and C. a convertor including: i. an input port connected to said chromatograph output port having means to inject effluent from said chromatograph into said convertor, ii. conversion means to convert said injected effluent into said combustion products, said combustion products being in the gas phase, and having means to control said conversion to take place at a temperature in the range 600°-1700° C., iii. a convertor output port connected to said detector input port, and iv. means for transferring said combustion products to said detector.
Claim 2
Dependent Claim
136 words
A chromatographic detection system comprising, in combination: A. a gas chromatograph having a chromatograph output port, B. a nitric oxide (NO) gas detector having a detector input port, means for reacting combustion products with ozone (O 3 ), and means for detecting light having wavelength in the range 0.6-2.8 microns, and C. a convertor including: i. an input port connected to said chromatograph output port having means to inject effluent from said chromatograph into said convertor, ii. conversion means to convert said injected effluent into said combustion products, said combustion products being in the gas phase, and having means to control said conversion to take place at a temperature in the range 600°-1700° C., iii. a convertor output port connected to said detector input port, and iv. means for transferring said combustion products to said detector.
Claim 3
Dependent Claim
45 words
The detection system according to claim 1 wherein said conversion means comprises a furnace having a temperature control, means to inject oxygen (O 2 ) into said furnace, and means to establish a pressure in said furnace in the range 5 torr to 5 atmospheres.
Claim 4
Dependent Claim
24 words
The detection system according to claim 1 wherein said conversion means comprises a means to establish a flame disposed to intercept said injected effluent.
Claim 5
Dependent Claim
21 words
A detection system according to claim 3 wherein said means to establish a flame is adapted to provide an oxygen-rich flame.
Claim 6
Dependent Claim
35 words
The detection system according to claim 3 wherein said conversion means further includes means to control the environment of said flame to be air at a pressure in the range 5 torr to 5 atmospheres.
Claim 7
Independent Claim
99 words
A method for analysis of a sample dissolved in a gas phase solution comprising the sequential steps of: A. passing said solution through a gas chromatograph to produce a gas phase effluent, B. converting said effluent into combustion products in the gas phase at a temperature in the range 600°-1700° C., C. transferring said combustion products to a nitric oxide (NO) detector, and D. detecting the presences of NO at said detector, wherein said detecting step comprises the sub-steps of reacting said combustion products with ozone (O 3 ), and detecting light having wavelength in the range 0.6-2.8 microns.
Claim 8
Independent Claim
99 words
A method for analysis of a sample dissolved in a gas phase solution comprising the sequential steps of: A. passing said solution through a gas chromatograph to produce a gas phase effluent, B. converting said effluent into combustion products in the gas phase at a temperature in the range 600°-1700° C., C. transferring said combustion products to a nitric oxide (NO) detector, and D. detecting the presences of NO at said detector, wherein said detecting step comprises the sub-steps of reacting said combustion products with ozone (O 3 ), and detecting light having wavelength in the range 0.6-2.8 microns.
Claim 9
Dependent Claim
39 words
The detection means according to claim 6 wherein said converting step includes the sub-step of injecting said effluent together with oxygen into a furnace while maintaining said furnace at a pressure in the range 5 torr to 5 atmospheres.
Claim 10
Dependent Claim
24 words
The method according to claim 6 wherein said converting step includes the sub-steps of establishing a flame and injecting said effluent into said flame.
Claim 11
Dependent Claim
14 words
The method according to claim 8 wherein said flame is maintained to be oxygen-rich.
Claim 12
Dependent Claim
26 words
The method according to claim 8 wherein said flame is established in an air environment at a pressure in the range 5 torr to 5 atmospheres.
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) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |