Ionization detector for gas chromatography
Abstract
Abstract AN IONIZATION DETECTOR IN WHICH THE COLLECTING ELECTRODE IS PLACED BETWEEN CHARGED BARRIER ELECTRODES. THE BARRIER ELECTRODES SET UP A POTENTIAL BARRIER AROUND THE COLLECTOR ELECTRODE. CHARGED PARTICLES HAVING ENERGIES HIGH ENOUGH TO SURMOUNT THE POTENTIAL BARRIER FALL INTO THE POTENTIAL WELL BETWEEN THE BARRIER ELECTRODES AND ARE EFFICIENTLY COLLECTED BY THE COLLECTOR ELECTRODE. THE BIAS VOLTAGE ON THE BARRIER ELECTRODES CAN BE ADJUSTED SO THAT ONLY CHARGED PARTICLES OF A DESIRED ENERGY WILL BE COLLECTED. THE DETECTOR CAN BE MADE TO RESPOND SELECTIVELY TO ONLY A DESIRED CLASS OF COMPOUNDS IN THE CHROMATOGRAPHIC COLUMN EFFLUENT BY SUITABLE ADJUSTMENT OF THE BIAS VOLTAGE ON THE BARRIER ELECTRODES.
Inventors
- 👤 Martin E Scolnick
Bibliographic Details
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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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |