US3677709A
Expired / Lapsed
US
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Flame ionization detection apparatus and method
Assignee: Hewlett Packard GmbH Germany
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Filing: 1970-07-02
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Granted: 1972-07-18
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Expires: 1990-07-02
Abstract
Abstract A FLAME IONIZATION DETECTOR FOR USE IN GAS CHROMATOGRAPHY INCLUDES A COLLECTOR RING WHICH IS POSITIONALLY ADJUSTABLE WITH RESPECT TO A FLAME NOZZLE. THE COLLECTOR RING SUPPORTS ONE OR MORE PIECES OF SALT IN AN INTERCHANGEABLE MANNER, EACH SALT BEING OPERABLE TO AMPLIFY IONIC CURRENT IN A DIFFERENT SUBSTANCE. PESTICIDE COMPONENTS SUCH AS PHOSPHORUS AND NITROGEN ARE DISTINGUISHED FROM HYDROCARBONS AND CHLORINATED SUBSTANCES BY THE DIFFERENCES IN MAGNITUDE AND POLARITY OF THE CORRESPONDING PEAKS OBTAINED ON A CHROMATOGRAM. THIS IS ACHIEVED BY OPTIMIZING THE COLLECTOR IONIC CURRENT AND GRADUALLY INCREASING THE QUANTITY OF COMBUSTIBLE GAS SUPPLIED TO THE DETECTOR.
Inventors
- 👤 Manfred Riedmann
- 👤 Martin Eichner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:36
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/62; G01N30/64; G01N30/68; Y; Y10; Y10T; Y10T436/00; Y10T436/16; Y10T436/19
Claims Analysis
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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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |