Patent US3721847A successfully refreshed from Google Patents.
US3721847A
Expired / Lapsed
US
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Apparatus for producing x-rays from an electric insulator
Assignee: Toshiba Corp
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Filing: 1971-11-01
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Granted: 1973-03-20
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Expires: 1991-11-01
Abstract
Abstract Apparatus for producing X-rays from an electric insulator. Two electrodes are disposed to contact the electric insulator. One electrode has a larger contact area with the insulator than that of the other. When a high D.C. or A.C. voltage is applied across the electrodes, the electric field becomes stronger in the portion of the insulator near the contact section with the small electrode, resulting in the production of X-rays from the vicinity of the contact section of the insulator with the small electrode.
Inventors
- 👤 M Terasawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:22
CPC Classifications
H; H01; H01J; H01J35/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
59 words
Apparatus for producing X-rays comprising: an electric insulator; and first and second electrodes which contact said insulator and are spaced apart from each other; the contact area of said first electrode with said insulator being smaller than that of said second electrode, thereby emitting X-rays from said insulator upon application of a voltage across said first and second electrodes.
Claim 2
Dependent Claim
59 words
Apparatus for producing X-rays comprising: an electric insulator; and first and second electrodes which contact said insulator and are spaced apart from each other; the contact area of said first electrode with said insulator being smaller than that of said second electrode, thereby emitting X-rays from said insulator upon application of a voltage across said first and second electrodes.
Claim 3
Dependent Claim
20 words
Apparatus according to claim 1 wherein said first and second electrodes are disposed so as to sandwich said insulator therebetween.
Claim 4
Dependent Claim
20 words
Apparatus according to claim 1 wherein said first and second electrodes are disposed on the identical surface of said insulator.
Claim 5
Dependent Claim
23 words
Apparatus according to claim 1 wherein said first electrode is at least one spot electrode and said second electrode is a plate electrode.
Claim 6
Dependent Claim
21 words
Apparatus according to claim 1 wherein said first electrode is a needle-shaped electrode and said second electrode is a plate electrode.
Claim 7
Dependent Claim
40 words
Apparatus according to claim 1 wherein said first and second electrodes contact the upper and lower surfaces of said insulator so as to sandwich said insulator and said second electrode is extended to at least the sides of said insulator.
Claim 8
Dependent Claim
34 words
Apparatus according to claim 2 wherein the surface of said insulator contacting said first electrode has a protruding peripheral portion and said first electrode contacts said insulator substantially at the center of said surface.
Claim 9
Dependent Claim
28 words
Apparatus according to claim 1 wherein said insulator is one selected from a group consisting of quartz glass, ruby, alumina, yttrium garnet, lithium niobate, calcium tungstate, and mica.
Claim 10
Dependent Claim
19 words
Apparatus according to claim 1 wherein said insulator is a mixture of powders of insulating material and conducting material.
Claim 11
Dependent Claim
25 words
Apparatus according to claim 1 wherein said insulator is either aluminum or iron on a surface of which an electricallY insulating oxidizing layer is formed.
Claim 12
Dependent Claim
87 words
Apparatus for the production of X-rays comprising: a vessel capable of substantially preventing the transmission of X-rays; a window mounted on part of said vessel to substantially transmit X-rays therethrough; an electric insulator disposed within said vessel; a first electrode and a second electrode each contacting said insulator, the contact area of said first electrode with said insulator being larger than that of said second electrode; and first and second conductors respectively connected to said first and second electrodes and extending to the outside of said vessel.
Claim 13
Dependent Claim
87 words
Apparatus for the production of X-rays comprising: a vessel capable of substantially preventing the transmission of X-rays; a window mounted on part of said vessel to substantially transmit X-rays therethrough; an electric insulator disposed within said vessel; a first electrode and a second electrode each contacting said insulator, the contact area of said first electrode with said insulator being larger than that of said second electrode; and first and second conductors respectively connected to said first and second electrodes and extending to the outside of said vessel.
Claim 14
Dependent Claim
20 words
Apparatus according to claim 11 wherein there is further provided a voltage source connected across said first and second conductors.
Claim 15
Dependent Claim
13 words
Apparatus according to claim 12 wherein said voltage source is D.C. voltage source.
Claim 16
Dependent Claim
13 words
Apparatus according to claim 12 wherein said voltage source is A.C. voltage source.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |