US4051403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Channel plate multiplier having higher secondary emission coefficient near input
Assignee: United States Department of the Army
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Filing: 1976-08-10
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Granted: 1977-09-27
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Expires: 1996-08-10
Abstract
Abstract An improved microchannel plate is provided by adding a coating or coatingso the input end of the channels which have a much higher second emission coefficient than the material which forms the body of the plate.
Inventors
- 👤 Robert M. Feingold
- 👤 Carl W. Hoover, Jr.
- 👤 John Rennie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:07
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/04; H01J43/06; H01J43/18; H01J43/24; H01J43/246; H01J31/00; H01J31/08; H01J31/50; H01J31/506; H01J31/507
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
86 words
In a microchannel plate electron multiplier comprising a plurality of channels, each of said channels having a diameter on the order of 10-15 microns and a length on the order of about 20 mils, the channel wall comprising a conductive glass having a relatively low coefficient of secondary emission, the improvement comprising: a first layer of booster material having a relatively high coefficient of secondary emission, and covering said wall from the microchannel plate input for a distance on the order of about 10 channel diameters.
Claim 2
Dependent Claim
86 words
In a microchannel plate electron multiplier comprising a plurality of channels, each of said channels having a diameter on the order of 10-15 microns and a length on the order of about 20 mils, the channel wall comprising a conductive glass having a relatively low coefficient of secondary emission, the improvement comprising: a first layer of booster material having a relatively high coefficient of secondary emission, and covering said wall from the microchannel plate input for a distance on the order of about 10 channel diameters.
Claim 3
Dependent Claim
45 words
An electron multiplier according to claim 1 wherein: said booster material is coated with a second layer of a good conductor said second layer coating the entire input surface of the plate and extending into said channels less than the cross-sectional dimension of the channel.
Claim 4
Dependent Claim
14 words
An electron multiplier according to claim 1 wherein: said booster material is cesium iodide.
Claim 5
Dependent Claim
34 words
An electron multiplier according to claim 1 wherein a base layer of highly conductive material is deposited only on portions of said walls covered by said second layer before said second layer is deposited.
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) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |