US3790840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary electron multiplying device using semiconductor ceramic
Assignee: Murata Manufacturing Co Ltd
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Filing: 1972-03-31
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Granted: 1974-02-05
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Expires: 1992-03-31
Abstract
Abstract A secondary electron multiplying device having high sensitivity for various kinds of electrically charged particles (e.g. electrons, positive ions, negative ions), X-rays, radio active rays, etc., is made of a molded article of a zinc oxide-titanium oxide type semiconductor ceramic, and is provided with at least two electrodes and having at least one hole. The molded article of the device can be produced in form of a single tube or a bundle of a plurality of such tubes. Electrons fed into the tube or tubes impact with the semiconductor ceramic causing secondary electron emission and the number of electrons emitted is greater than the number of electrons fed into the device.
Inventors
- 👤 M Toyoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:53
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/04; H01J43/06; H01J43/18; H01J43/24
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
40 words
A secondary electron multiplying device comprising a molded article having at least one hole therethrough and at least two electrodes of conductive material on said molded article, said molded article being made of a zinc oxide-titanium oxide type semiconductor ceramic.
Claim 2
Dependent Claim
40 words
A secondary electron multiplying device comprising a molded article having at least one hole therethrough and at least two electrodes of conductive material on said molded article, said molded article being made of a zinc oxide-titanium oxide type semiconductor ceramic.
Claim 3
Dependent Claim
34 words
A secondary electron multiplying device according to claim 1 wherein the molded article is a rectangular block with electrodes on opposite faces thereof and has a plurality of holes therethrough perpendicular to the electrodes.
Claim 4
Dependent Claim
16 words
A secondary electron multiplying device according to claim 1, wherein the molded article is a tube.
Claim 5
Dependent Claim
15 words
A secondary electron multiplying device according to claim 3, wherein said tube is cylindrically shaped.
Claim 6
Dependent Claim
15 words
A secondary electron multiplying device according to claim 3, wherein said tube is polygonally shaped.
Claim 7
Dependent Claim
37 words
A secondary electron multiplying device comprising a plurality of hollow tubes each being of a zinc oxide-titanium oxide semiconductor ceramic and each having two electrodes of a conductive material thereon, said tubes being arranged in a bundle.
Claim 8
Dependent Claim
37 words
A secondary electron multiplying device comprising a plurality of hollow tubes each being of a zinc oxide-titanium oxide semiconductor ceramic and each having two electrodes of a conductive material thereon, said tubes being arranged in a bundle.
Claim 9
Dependent Claim
16 words
A secondary electron multiplying device according to claim 6, wherein said tubes are cylindrical and straight.
Claim 10
Dependent Claim
41 words
A secondary electron multiplying device according to claim 6, wherein said tubes are triangular in cross section and straight and are stacked in the shape of a pyramid and define triangular cross sectional spaces between every set of three stacked tubes.
Claim 11
Dependent Claim
49 words
A secondary electron multiplying device according to claim 6, wherein said tubes are polygonal tubes having grooves in some of the sides, and wherein the arrangement of the tubes is such that said grooves lie opposite grooves in adjacent tubes in the bundle to form holes through said bundle.
Claim 12
Dependent Claim
18 words
A secondary electron multiplying device according to claim 6, wherein the tubes are mutually twisted around each other.
Claim 13
Dependent Claim
45 words
A secondary electron multiplying device according to claim 6, wherein said zinc oxide-titanium oxide type semiconductor ceramic contains zinc oxide in a mol percentage of about 50 to 99 percent mol and titanium oxide in a mol percentage of about 1 to 50 mol %.
References Cited (Backward Citations)
US3612946A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |