Patent US3983437A successfully refreshed from Google Patents.
US3983437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic radiation detector
Assignee: Energy Research and Development Administration ERDA
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Filing: 1968-03-12
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Granted: 1976-09-28
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Expires: 1988-03-12
Abstract
Abstract An electromagnetic radiation detector including a collimating window, a cathode member having a photoelectric emissive material surface angularly disposed to said window whereby radiation is impinged thereon at acute angles, an anode, separated from the cathode member by an evacuated space, for collecting photoelectrons emitted from the emissive cathode surface, and a negatively biased, high transmissive grid disposed between the cathode member and anode.
Inventors
- 👤 Jay L. Benson
- 👤 Gordon J. Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:02
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/04; H01J43/06; H01J43/18; H01J43/20; G; G01; G01T; G01T1/00; G01T1/16; G01T1/28; H01J40/00; H01J40/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
An electromagnetic radiation detector having a central axis and a radiation entrance end, comprising a cathode member having an exterior photoelectric emissive surface disposed at an acute angle to said central axis, anode means separated from and cylindrically disposed about said cathode member for collecting primary electrons emitted from said emissive cathode surface, high transmissive grid means disposed between said cathode member and said collecting means for blocking secondary electrons emitted from said emissive cathode surface with said primary electrons.
Claim 2
Dependent Claim
80 words
An electromagnetic radiation detector having a central axis and a radiation entrance end, comprising a cathode member having an exterior photoelectric emissive surface disposed at an acute angle to said central axis, anode means separated from and cylindrically disposed about said cathode member for collecting primary electrons emitted from said emissive cathode surface, high transmissive grid means disposed between said cathode member and said collecting means for blocking secondary electrons emitted from said emissive cathode surface with said primary electrons.
Claim 3
Dependent Claim
22 words
The detector of claim 1 wherein said emissive surface is in a conical configuration and said cathode member comprises a solid core.
Claim 4
Dependent Claim
12 words
The detector of claim 2 wherein said photoelectric emissive material is gold.
Claim 5
Dependent Claim
16 words
The detector of claim 2 wherein said grid means is in the configuration of a helix.
Claim 6
Dependent Claim
17 words
The detector of claim 4 wherein said grid means has a transmissivity of at least about 90%.
Claim 7
Dependent Claim
36 words
The detector of claim 1 wherein said grid means is biased at a voltage negative with respect to said cathode member and said collector by an amount on the order of at least about 200 volts.
Claim 8
Dependent Claim
19 words
The detector of claim 1 wherein said cathode member and said collector means are biased at the same potential.
Claim 9
Dependent Claim
28 words
The detector of claim 1 including means integral with said anode means for restricting impinging radiation to that striking said emissive cathode surface at acute angles of incidence.
Claim 10
Dependent Claim
34 words
The detector of claim 8 wherein said collecting means forms a radiation impervious housing around said cathode member and grid means and said impinging means is a radiation pervious window in said collecting means.
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) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |