US3563657A
Expired / Lapsed
US
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Direct-reading spectrometer system and method for narrow range measurements
Assignee: Iowa State University Research Foundation Inc
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Filing: 1968-08-09
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Granted: 1971-02-16
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Expires: 1988-08-09
Abstract
Abstract AN ELECTRON IMAGE OF THE DISPERSED SPECTRAL LINES CHARACTERISTIC OF A CHEMICAL ELEMENT BEING ANALYZED IS PERIODICALLY SCANNED ACROSS A SLIT-LIKE APERTURE OF AN IMAGE DISSECTOR PHOTOTUBE. A GATING PULSE IS DELAYED RELATIVE TO THE START OF EACH SWEEP TO SIGNAL THE TIME WHEN THE NARROW RANGE OF INTEREST IN THE ELECTRON IMAGE IS PASSING THROUGH THE SLIT; AND THE GATING PULSE ENABLES AN AMPLIFIER RECEIV- ING THE OUTPUT SIGNAL OF THE PHOTUBE TO SELECTIVELY AMPLIFY ONLY THIS NARROW RANGE. THE SIGNAL FROM THE GATED AMPLIFIER IS THEN FED TO AN INTEGRATOR CIRCUIT WHICH STORES THE GATED SIGNAL FOR A KNOWN NUMBER OF SWEEPS.
Inventors
- 👤 Richard N Kniseley
- 👤 Velmer A Fassel
- 👤 Danold W Golightly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:34
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/04; H01J43/06; G; G01; G01J; G01J3/00; G01J3/28
Claims Analysis
Total Claims: 0
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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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |