US3818228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Field termination plates for charged particle analyzers
Assignee: Physical Electronics Inc
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Filing: 1973-08-17
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Granted: 1974-06-18
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Expires: 1993-08-17
Abstract
Abstract A field termination plates is provided for charged particle analysis apparatus wherein the plate includes an electrical insulator substrate which has a surface thereof a plurality of narrow width conductive strips arranged to correspond to equipotential lines. Over a portion of a surface a band of high resistance material is deposited in contact with and transverse to said conductive strips. Over the entire surface including the conductive strips and the band of high resistance material is deposited a very high resistance electrically conductive material.
Inventors
- 👤 P Palmberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:04
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/26; H01J49/34; H01J49/42; H01J49/4205; H01J49/421; H01J49/4215; H01J49/02; H01J49/22; H01J49/4255
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
157 words
An electric field assembly comprising: a. first and second conductive members defining a space therebetween; b. an electrically non-conductive member positioned adjacent at least one corresponding end of said first and second conductive members to provide a surface facing inwardly between said conductive members, said non-conductive member defining a field termination plate; c. a plurality of spaced narrow width, low resistance electrically conducting strips positioned on said nonconductive member inwardly facing surface and spaced thereon in paths correspondiNg to an equipotential line between said first and second conductive members when said members are of infinite length; d. a first layer of high resistance electrically conductive material on a portion of the inward face of said non-conducting member in electrical contact with and extending transversely across said strips; and, e. a second layer of very high resistance electrically conductive material extending over the entire interiorly facing surface of said non-conducting member including said strips and said first layer.
Claim 2
Dependent Claim
157 words
An electric field assembly comprising: a. first and second conductive members defining a space therebetween; b. an electrically non-conductive member positioned adjacent at least one corresponding end of said first and second conductive members to provide a surface facing inwardly between said conductive members, said non-conductive member defining a field termination plate; c. a plurality of spaced narrow width, low resistance electrically conducting strips positioned on said nonconductive member inwardly facing surface and spaced thereon in paths correspondiNg to an equipotential line between said first and second conductive members when said members are of infinite length; d. a first layer of high resistance electrically conductive material on a portion of the inward face of said non-conducting member in electrical contact with and extending transversely across said strips; and, e. a second layer of very high resistance electrically conductive material extending over the entire interiorly facing surface of said non-conducting member including said strips and said first layer.
Claim 3
Dependent Claim
23 words
An assembly in accordance with claim 1 wherein the ratio of the resistivities of said first and second layers is greater than 10:1.
Claim 4
Dependent Claim
33 words
An assembly in accordance with claim 1 wherein said first layer has a resistivity of about one megohm per square and said second layer has a resistivity of about 100 megohm per square.
Claim 5
Dependent Claim
19 words
An assembly in accordance with claim 2 wherein said conducting strips are metal and are covered by said layers.
Claim 6
Dependent Claim
67 words
An assembly in accordance with claim 1 wherein said first and second conductive members are metal cylinders coaxially arranged with respect to one another with the inner cylinder having an annular opening in the wall thereof adjacent each end thereof and said non-conductive member is annular in configuration with one non-conductive member positioned adjacent each end of said cylinders holding them in spaced relationship to one another.
Claim 7
Dependent Claim
15 words
An assembly in accordance with claim 5 wherein said non-conductive members are hollow truncated cones.
Claim 8
Dependent Claim
23 words
An assembly in accordance with claim 5 wherein said conductive strips are narrow rings of metal coaxial to the axis of said cylinders.
Claim 9
Dependent Claim
33 words
An assembly in accordance with claim 5 wherein said first layer is deposited over a sector of each of said annular non-conducting members and said second layer is deposited over said first layer.
Claim 10
Dependent Claim
119 words
An end disc for minimization of electrical field fringing in a cylindrical analyzer for charged particles comprising: a. an annular shaped plate member constructed of of a non-conductive material; b. a plurality of spaced narrow width electrical conducting strips on said non-conductive plate coaxially arranged with respect to the axis of said non-conductive plate and with respect to one another; e. a first layer of high resistance electrically conductive material on a sector of the surface of said non-conductive plate and extending transversely across and in electrical contact with said strips; f. a second layer of very high resistance electrically conducting material overlying said first layer and the balance of the surface of said non-conducting plate and said strips.
Claim 11
Dependent Claim
119 words
An end disc for minimization of electrical field fringing in a cylindrical analyzer for charged particles comprising: a. an annular shaped plate member constructed of of a non-conductive material; b. a plurality of spaced narrow width electrical conducting strips on said non-conductive plate coaxially arranged with respect to the axis of said non-conductive plate and with respect to one another; e. a first layer of high resistance electrically conductive material on a sector of the surface of said non-conductive plate and extending transversely across and in electrical contact with said strips; f. a second layer of very high resistance electrically conducting material overlying said first layer and the balance of the surface of said non-conducting plate and said strips.
Claim 12
Dependent Claim
26 words
An end disc in accordance with claim 9 wherein the ratio of the resistivity of said second layer to said first layer is greater than 10:1.
Claim 13
Dependent Claim
16 words
An end disc in accordance with claim 9 wherein said plate is a hollow truncated cone.
Claim 14
Dependent Claim
34 words
An end disc in accordance with claim 11 wherein said first layer has a resistivity of about one megohm per square and said second layer has a resistivity of about 100 megohms per square.
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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |