Patent US4039887A successfully refreshed from Google Patents.
US4039887A
Expired / Lapsed
US
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Electron emitter including porous antimony
Assignee: RCA Corp
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Filing: 1975-06-04
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Granted: 1977-08-02
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Expires: 1995-06-04
Abstract
Abstract A reflective type photocathode of a photomultiplier includes a porous antimony layer in overlay relation to a layer of solid antimony along a supporting substrate.
Inventors
- 👤 Arthur Frederick McDonie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:58
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/12; H01J1/00; H01J1/02; H01J9/20; H01J2201/00; H01J2201/32; H01J2201/34
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
77 words
An electron emissive electrode comprising: (a) a base support member; (b) a solid layer of antimony disposed on said support member, said solid layer being less than about 1000 Angstroms thick and including the reaction products of antimony with at least one alkali metal; and (c) a porous layer of antimony disposed on said solid layer, said porous layer being about 4 microns thick and including the reaction products of antimony with at least one alkali metal.
Claim 2
Dependent Claim
77 words
An electron emissive electrode comprising: (a) a base support member; (b) a solid layer of antimony disposed on said support member, said solid layer being less than about 1000 Angstroms thick and including the reaction products of antimony with at least one alkali metal; and (c) a porous layer of antimony disposed on said solid layer, said porous layer being about 4 microns thick and including the reaction products of antimony with at least one alkali metal.
Claim 3
Dependent Claim
12 words
The electrode of claim 1 wherein said base support member comprises glass.
Claim 4
Dependent Claim
12 words
The electrode of claim 1 wherein said support member comprises a metal.
Claim 5
Dependent Claim
20 words
The electrode of claim 3 further comprising a metal oxide buffer film between said support member and said solid layer.
Claim 6
Dependent Claim
21 words
The electrode of claim 4 wherein said metal support member is composed of nickel, and said metal oxide is manganese oxide.
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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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |