US3626233A
Expired / Lapsed
US
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Channel multiplier of aluminum oxide produced anodically
Assignee: Horizons Research Inc
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Filing: 1968-09-20
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Granted: 1971-12-07
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Expires: 1988-09-20
Abstract
Abstract Microchannel plates prepared from anodized aluminum layers etched to increase the pore volume to approximately 50 percent and then treated to exhibit suitable electrical properties for use as a channel plate.
Inventors
- 👤 Eugene Wainer
- 👤 Selwyn H Rose
- 👤 Theodore M Harkulich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:59
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/04; H01J43/06; H01J43/18; H01J43/24; H01J43/246; C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/18; C25D11/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
116 words
An electrical channel plate comprising a layer of porous aluminum oxide produced anodically and having parallel, straight sided pores extending through said channel plate, said plate being between about 20 and 100 microns thick and having center to center pore spacing of between about 0.3 to 2.0 microns, at least about 20 percent open area, channel diameters between about 0.25 micron and 1.5 microns, the channel diameters and layer thickness being related so that the length-to-diameter ratio of said pores is 30 to 200, the surfaces of said pores being doped to enhance the secondary emissivity of said aluminum oxide so that it exhibits an electron multiplication factor of between 100 and 10,000 at 2000 volts.
Claim 2
Dependent Claim
116 words
An electrical channel plate comprising a layer of porous aluminum oxide produced anodically and having parallel, straight sided pores extending through said channel plate, said plate being between about 20 and 100 microns thick and having center to center pore spacing of between about 0.3 to 2.0 microns, at least about 20 percent open area, channel diameters between about 0.25 micron and 1.5 microns, the channel diameters and layer thickness being related so that the length-to-diameter ratio of said pores is 30 to 200, the surfaces of said pores being doped to enhance the secondary emissivity of said aluminum oxide so that it exhibits an electron multiplication factor of between 100 and 10,000 at 2000 volts.
Claim 3
Dependent Claim
31 words
The channel plate of claim 1 in which the material in said pores includes a compound of a metal selected from the group consisting of alkali metals and alkaline earth metals.
Claim 4
Dependent Claim
28 words
The channel plate of claim 1 wherein the channel plate is 50 microns thick, the channel diameters are 0.8 micron and the open area is approximately 50 percent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |