US4013913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion detection electrode arrangement
Assignee: Hnu Systems Inc
•
Filing: 1976-01-19
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Granted: 1977-03-22
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Expires: 1996-01-19
Abstract
Abstract An electrode arrangement for the detection of species ionized by radiant energy from a radiation source, comprising: an annular cathode; a shield, opaque to the radiant energy, extending across the cathode and having an aperture smaller than and coaxial with the annulus formed by the cathode; and an elongated anode having its distal end coaxially of the cathode and the shield aperture, the cathode being shielded from and the anode being exposed to the radiant energy from the radiation source.
Inventors
- 👤 John N. Driscoll
- 👤 Frederick F. Spaziani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:39
CPC Classifications
H; H01; H01J; H01J41/00; H01J41/02; G; G01; G01N; G01N27/00; G01N27/62; G01N27/64; G01N27/66; H01J1/00; H01J1/52
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
143 words
An electrode arrangement for detecting ionized species in apparatus comprising a radiation source for ionizing said species and detection electrodes comprising an anode and a cathode, said arrangement comprising: said cathode having an annular configuration defining an annulus extending in a transverse plane across the axis of radiant energy emission from said radiation source; said anode having a distal end positioned centrally of said cathode annulus in the path of radiant energy emission from said radiation source; and a shield opaque to said radiant energy extending between said cathode and said radiation source, said shield having an aperture therethrough aligned with said cathode annulus and defining a wall of said shield spaced radially inwardly from said cathode annulus, said anode thereby adapted for direct exposure to said radiant energy through said aperture and said cathode shielded from said radiant energy by said shield.
Claim 2
Dependent Claim
143 words
An electrode arrangement for detecting ionized species in apparatus comprising a radiation source for ionizing said species and detection electrodes comprising an anode and a cathode, said arrangement comprising: said cathode having an annular configuration defining an annulus extending in a transverse plane across the axis of radiant energy emission from said radiation source; said anode having a distal end positioned centrally of said cathode annulus in the path of radiant energy emission from said radiation source; and a shield opaque to said radiant energy extending between said cathode and said radiation source, said shield having an aperture therethrough aligned with said cathode annulus and defining a wall of said shield spaced radially inwardly from said cathode annulus, said anode thereby adapted for direct exposure to said radiant energy through said aperture and said cathode shielded from said radiant energy by said shield.
Claim 3
Dependent Claim
28 words
The electrode arrangement claimed in claim 1 in which said shield comprises metallic electrostatic shielding means spaced from said cathode and between said cathode and said radiation source.
Claim 4
Dependent Claim
38 words
The electrode arrangement claimed in claim 1 in which said cathode extends axially a predetermined distance and said shield has a lip within said cathode annulus extending axially a distance less than the axial extent of said cathode.
Claim 5
Dependent Claim
20 words
The electrode arrangement claimed in claim 3 in which said cathode and said shield are spaced apart from each other.
Claim 6
Dependent Claim
15 words
The electrode arrangement claimed in claim 1 in which said shield comprises organic plastic material.
Claim 7
Dependent Claim
29 words
The electrode arrangement claimed in claim 1 in which said shield comprises metallic electrostatic shielding material extending outwardly from said aperture beyond said cathode and spaced from said cathode.
Claim 8
Dependent Claim
31 words
The electrode arrangement claimed in claim 6 in which said electrodes are positioned in an annular chamber and said electrostatic shielding material extends outwardly to adjacent the edge of said chamber.
Claim 9
Dependent Claim
24 words
The electrode arrangement claimed in claim 6 in which said shield also comprises organic plastic material positioned between said cathode and said metallic material.
Claim 10
Dependent Claim
19 words
The electrode arrangement claimed in claim 6 in which said electrostatic shielding material comprises a low flux ferromagnetic material.
Claim 11
Dependent Claim
35 words
The electrode arrangement claimed in claim 6 in which said metallic material comprises a coating on an organic plastic material and said organic plastic material is positioned between said metallic material and said radiation source.
Claim 12
Dependent Claim
24 words
The electrode arrangement claimed in claim 10 in which said shield also comprises organic plastic material positioned between said cathode and said metallic material.
Claim 13
Dependent Claim
13 words
The electrode arrangement claimed in claim 11 in which said coating comprises aluminum.
Claim 14
Dependent Claim
47 words
The electrode arrangement claimed in claim 1 in which said anode extends along said axis and said distal end is spaced closely adjacent said radiation source, said cathode, and said aperture are coaxial of said axis, and the plane of said cathode is normal to said axis.
Claim 15
Dependent Claim
42 words
The electrode arrangement claimed in claim 13 in which said anode is tubular for conveying species to adjacent said radiation source, said anode is closed on its end adjacent said source and has exit ports on the sides thereof adjacent said end.
Claim 16
Dependent Claim
15 words
The electrode arrangement claimed in claim 13 in which said cathode is a continuous annulus.
Claim 17
Dependent Claim
38 words
The electrode arrangement claimed in claim 15 in which said cathode extends axially a predetermined distance and said shield has a lip within said cathode annulus extending axially a distance less than the axial extent of said cathode.
Claim 18
Dependent Claim
20 words
The electrode arrangement claimed in claim 16 in which said cathode and said shield are spaced apart from each other.
Claim 19
Dependent Claim
49 words
The electrode arrangement claimed in claim 16 in which said shield comprises fluorinated hydrocarbon plastic material adjacent said cathode and further comprises metallic electrostatic shielding material positioned between said plastic material and said radiation source extending radially inwardly to adjacent said aperture and extending radially outwardly beyond said cathode.
Claim 20
Dependent Claim
31 words
The electrode arrangement claimed in claim 18 in which said electrodes are positioned in an annular chamber and said electrostatic shielding material extends outwardly to adjacent the edge of said chamber.
Claim 21
Dependent Claim
27 words
The electrode arrangement claimed in claim 18 in which said shield also comprises a second organic plastic material positioned between said metallic material and said radiation source.
Claim 22
Dependent Claim
21 words
The electrode arrangement claimed in claim 20 in which said metallic material comprises an aluminum coating on said second plastic material.
References Cited (Backward Citations)
US3591801A
Cited
US3918811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |