US3562894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making electron multiplier wafer
Assignee: Weston Instruments Inc
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Filing: 1968-08-26
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Granted: 1971-02-16
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Expires: 1988-08-26
Abstract
Abstract AN ILLUSTRATIVE EMBODIMENT OF THE DISCLOSURE DISCLOSES A PHANO-CONCAVE WAFER OF CHANNEL ELECTRON MULTIPLIERS IN AN ELECTRON-OPTICAL SYSTEM THAT PRODUCES INVERTED AND INTENSIFIED IMAGES OF FAINTLY ILLUMINATED OBJECTS. THE INDIVIDUAL CHANNELS ARE RELATIVELY SHORT AT THE CENTER OF THE WAFER AND GRADUALLY INCREASE LENGTH TOWARD THE PERIPHERY IN ORDER TO PRODUCE THE CONCAVE EQUIPOTENTIAL SURFACE NEEDED FOR ELECTRON IMAGE INVERSION. THE RESPECTIVE CHANNEL DIAMETERS AND VARIED IN ACCORDANCE WITH EACH CHANNEL LENGTH TO MAINTAIN A GENERALLY CONSTANT RATIO OF LENGTH TO DIAMETER AND THE ASSOCIATED ELECTRON GAIN FOR ALL OF THE CHANNELS IN THE WAFER.
Inventors
- 👤 Martin Rome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:57
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/02; C03B37/025; C03B37/028; H; H01; H01J; H01J29/00; H01J29/02; H01J29/023; H01J43/00; H01J43/04; H01J43/06; H01J43/18; H01J43/24; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49016; Y10T29/49018; Y10T29/49789; Y10T29/49798
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) | 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 |