Patent US3676682A successfully refreshed from Google Patents.
US3676682A
Expired / Lapsed
US
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Absorbed ionizing radiation measuring device
Assignee: Individual
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Filing: 1968-10-30
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Granted: 1972-07-11
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Expires: 1988-10-30
Abstract
Abstract An ionization chamber for measuring absorbed radiation is disclosed, the chamber including a housing which incorporates an anode, a cathode, and a space charge electrode. The anode comprises a conducting plate which has a plurality of protruding needle points with each of the needle points and the conducting plate being at the same electrical potential. The space charge electrode has a plurality of holes therein and is physically displaced from the anode with the holes of the space charge electrode being in registry with the needle points of the anode. The potential of the space charge electrode is less than that of the anode itself.
Inventors
- 👤 Fred W Falk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:56
CPC Classifications
H; H01; H01J; H01J47/00; H01J47/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
98 words
An ionization chamber for measuring absorbed radia-tion, said chamber including a housing incorporating an anode and a cathode, said anode comprising a conducting plate having a plurality of protruding needle points, each of said needle points and said conducting plate being at the same potential, a space charge electrode having a plurality of holes therein, said space charge electrode being physically displaced from said anode with the holes of said space charge electrode being in registry with said needle points of said anode with the potential of said space charge electrode being less than that of said anode.
Claim 2
Dependent Claim
98 words
An ionization chamber for measuring absorbed radia-tion, said chamber including a housing incorporating an anode and a cathode, said anode comprising a conducting plate having a plurality of protruding needle points, each of said needle points and said conducting plate being at the same potential, a space charge electrode having a plurality of holes therein, said space charge electrode being physically displaced from said anode with the holes of said space charge electrode being in registry with said needle points of said anode with the potential of said space charge electrode being less than that of said anode.
Claim 3
Dependent Claim
20 words
An ionization chamber as defined in claim 1, wherein each of said components thereof are constructed of tissue equivalent material.
Claim 4
Dependent Claim
30 words
An ionization chamber as defined in claim 2, wherein the edges of said hole in said space charge electrode are in close proximity to said needle points of said anode.
Claim 5
Dependent Claim
52 words
An ionization chamber as defined in claim 3, wherein said housing contains a gas and wherein said housing has windows therein which are covered with thin foil of preselected material, whereby the total effect of the covers in combination with said chamber and said filling gas therein provides a preselected energy response.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |