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Patent US3739216A successfully refreshed from Google Patents.
US3739216A
Expired / Lapsed
US
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Secondary electron multipliers with single layer cermet coatings
Assignee: Zenith Electronics LLC
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Filing: 1971-07-30
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Granted: 1973-06-12
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Expires: 1991-07-30
Abstract
Abstract Secondary electron multiplier devices having one or more secondary electron emission multiplier elements each consisting essentially of a single-layer cermet coating on a supporting substrate. The coating may be formed by various techniques including flash evaporation, vacuum sputtering, and chemical vapor deposition. Secondary emission ratios of two, three and more are attained with first cross-over voltages in the range from 20 to 40 volts. In applications where optimum temperature stability is required, gold/metal oxide cermets are employed.
Inventors
- 👤 S Pakswer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:49
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/04; H01J43/06; H01J43/18; H01J43/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
105 words
A secondary electron multiplier device comprising, within an evacuated envelope: a source of primary electrons; a secondary electron multiplier element consisting essentially of a single layer cermet coating on a supporting substrate, said single layer cermet coating consisting of metal globules dispersed in a matrix of inorganic dielectric material in which said metal globules are from 40 to 500 Angstrom Units in diameter and said inorganic dielectric material is a thin film having a thickness from 200 to 2,000 Angstrom Units, said secondary electron multiplier element being responsive to primary electrons from said source to generate secondary electrons; and means for utilizing said secondary electrons.
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |