US4071474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary-electron multiplier dynode
Assignee: Panasonic Holdings Corp
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Filing: 1975-10-14
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Granted: 1978-01-31
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Expires: 1995-10-14
Abstract
Abstract A surface layer type secondary-electron multiplier consisting of a support and a secondary-electron emissive and electron-conductive high-polymer layer formed thereupon is disclosed. For forming the secondary-electron emission layer, paint consisting of an electron-conductive high-polymer dissolved or suspended in solvents is used. Alternatively, the support may consist of a nitrogen- or sulphur-containing electron-donor polymeric composition which may be molded or formed, and a charge-transfer complex conductive layer may be formed upon the support.
Inventors
- 👤 Yoshio Kishimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:08
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/04; H01J43/06; H01J43/18; H01J43/24; C; C09; C09D; C09D5/00; C09D5/24; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31562; Y10T428/31565; Y10T428/31573; Y10T428/31576; Y10T428/3158; Y10T428/31587
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
85 words
In a dynode for a secondary electron multiplier having a dynode support or substrate made of an electrically insulating material and a secondary electron emissive and electron conductive layer formed upon a surface of said support or substrate the improvement which comprises forming said electron emissive and electron conductive layer from a high polymer composition emitting more secondary electrons than primary electrons by coating said support or substrate with a paint comprising said polymer composition dissolved in a solvent into which are dispersed electro-conductive particles.
Claim 2
Dependent Claim
85 words
In a dynode for a secondary electron multiplier having a dynode support or substrate made of an electrically insulating material and a secondary electron emissive and electron conductive layer formed upon a surface of said support or substrate the improvement which comprises forming said electron emissive and electron conductive layer from a high polymer composition emitting more secondary electrons than primary electrons by coating said support or substrate with a paint comprising said polymer composition dissolved in a solvent into which are dispersed electro-conductive particles.
Claim 3
Dependent Claim
17 words
The dynode of claim 1 wherein said polymer composition dissolved in said solvent is a thermoplastic resin.
Claim 4
Dependent Claim
18 words
The dynode of claim 1 wherein said polymer composition comprises an uncured thermosetting resin and a curing agent.
Claim 5
Dependent Claim
82 words
In a dynode for a secondary electron multiplier having a dynode support or substrate made of an electrically insulating material and a secondary electron emissive and electron conductive layer formed upon a surface of said support or substrate the improvement which comprises forming said electron emissive and electron conductive layer from a high polymer composition emitting more secondary electrons than primary electrons by coating said support or substrate with a paint comprising a charge-transfer complex type semi-conductive high polymer and a solvent.
Claim 6
Dependent Claim
82 words
In a dynode for a secondary electron multiplier having a dynode support or substrate made of an electrically insulating material and a secondary electron emissive and electron conductive layer formed upon a surface of said support or substrate the improvement which comprises forming said electron emissive and electron conductive layer from a high polymer composition emitting more secondary electrons than primary electrons by coating said support or substrate with a paint comprising a charge-transfer complex type semi-conductive high polymer and a solvent.
Claim 7
Dependent Claim
17 words
The dynode of claim 1 wherein said coated support or substrate is a porous or foamed composition.
Claim 8
Dependent Claim
22 words
The dynode of claim 4 wherein said support or substrate which is coated with said paint comprises a porous or foamed composition.
Claim 9
Dependent Claim
100 words
In a dynode for a secondary electron multiplier having a dynode support or substrate made of an electrically insulating material and a secondary electron emissive and electron conductive layer formed upon a surface of said support or substrate the improvement which comprises forming said support or substrate from a nitrogen- or sulfur-containing electron donor high polymer composition and said secondary electron emissive and electron conductive layer from a high polymer composition emitting more secondary electrons than primary electrons and including a charge-transfer complex produced by introducing an electron acceptor or its salt into a surface of said support or substrate.
Claim 10
Dependent Claim
100 words
In a dynode for a secondary electron multiplier having a dynode support or substrate made of an electrically insulating material and a secondary electron emissive and electron conductive layer formed upon a surface of said support or substrate the improvement which comprises forming said support or substrate from a nitrogen- or sulfur-containing electron donor high polymer composition and said secondary electron emissive and electron conductive layer from a high polymer composition emitting more secondary electrons than primary electrons and including a charge-transfer complex produced by introducing an electron acceptor or its salt into a surface of said support or substrate.
Claim 11
Dependent Claim
22 words
A dynode of claim 7 wherein said electron acceptor is a composition selected from the group consisting of 7,7,8,8-tetracyanoquinodimethane, p-chloranil and tetracyanoethylene.
Claim 12
Dependent Claim
14 words
The dynode of claim 7 wherein said electron donor high polymer composition includes polyurethane.
Claim 13
Dependent Claim
19 words
The dynode of claim 7 wherein said support or substrate is in the form of at least one pipe.
Claim 14
Dependent Claim
81 words
A dynode for a secondary electron multipler comprising a dynode support or substrate made of an electrically insulating material and a secondary electron emission layer of a secondary emission yield higher than 1 comprising an electron conductive high polymer composition of resistivity of 10 5 -10 10 ohm.cm formed upon a surface of said support or substrate by coating said support or substrate with a paint comprising a thermoplastic resin dissolved in a solvent into which are dispersed electrically conductive particles.
Claim 15
Dependent Claim
81 words
A dynode for a secondary electron multipler comprising a dynode support or substrate made of an electrically insulating material and a secondary electron emission layer of a secondary emission yield higher than 1 comprising an electron conductive high polymer composition of resistivity of 10 5 -10 10 ohm.cm formed upon a surface of said support or substrate by coating said support or substrate with a paint comprising a thermoplastic resin dissolved in a solvent into which are dispersed electrically conductive particles.
Claim 16
Dependent Claim
22 words
A dynode as set forth in claim 11 wherein said support or substrate is in the form of at least one pipe.
Claim 17
Dependent Claim
24 words
A dynode of claim 1 wherein a high polymer included in said electron conductive high polymer composition is a vinyl polymer or copolymers thereof.
Claim 18
Dependent Claim
16 words
The dynode of claim 13 wherein said vinyl polymer is a polyvinyl halide or copolymers thereof.
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) | 1981-01-30 | 1981-08-01 | 1982-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-30 | 1985-08-01 | 1986-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-30 | 1989-08-01 | 1990-01-31 | $7700.00 | Window Closed / Lapsed |