US3717782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction-coupled ring discharge device
Assignee: Hitachi Ltd
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Filing: 1970-03-03
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Granted: 1973-02-20
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Expires: 1990-03-03
Abstract
Abstract An induction-coupled ring discharge tube having a reduced electric field strength in the tube due to the charging of cadmium within the tube so that the discharge tube can operate with an electric power supply of relatively lower frequencies and the size of the magnetic core and discharge tube kept to a reasonable size.
Inventors
- 👤 M Yamamoto
- 👤 Y Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:17
CPC Classifications
H; H01; H01J; H01J65/00; H01J65/04; H01J65/042; H01J65/048; H01J61/00; H01J61/02; H01J61/12; H01J61/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
49 words
An induction-coupled discharge device comprising a ring discharge tube consisting of a closed ring including a gas for discharge and a vaporizable metal substance and cadmium used for reducing an electric-field strength and a magnetic core for supplying low-frequency induction power lower than 104Hz to said ring discharge tube.
Claim 2
Dependent Claim
49 words
An induction-coupled discharge device comprising a ring discharge tube consisting of a closed ring including a gas for discharge and a vaporizable metal substance and cadmium used for reducing an electric-field strength and a magnetic core for supplying low-frequency induction power lower than 104Hz to said ring discharge tube.
Claim 3
Dependent Claim
49 words
An induction-coupled discharge device comprising a ring discharge tube consisting of a closed ring including a gas for discharge and a vaporizable metal substance and cadmium used for reducing an electric-field strength and a magnetic core for supplying low-frequency induction power lower than 104Hz to said ring discharge tube.
Claim 4
Dependent Claim
49 words
An induction-coupled discharge device comprising a ring discharge tube consisting of a closed ring including a gas for discharge and a vaporizable metal substance and cadmium used for reducing an electric-field strength and a magnetic core for supplying low-frequency induction power lower than 104Hz to said ring discharge tube.
Claim 5
Dependent Claim
84 words
An induction-coupled space discharge apparatus, comprising: a ring discharge tube including a rare gas and a vaporizable metal substance; means, coupled to said tube, for inducing preliminary ionization within said discharge tube; means, coupled to said tube, for inducing a main discharge within said tube, said main discharge inducing means comprising a magnetic core inductively coupled with said tube and with an electric power supply therefor; and means for reducing the electric field strength of said discharge tube comprising cadmium contained within said tube.
Claim 6
Dependent Claim
84 words
An induction-coupled space discharge apparatus, comprising: a ring discharge tube including a rare gas and a vaporizable metal substance; means, coupled to said tube, for inducing preliminary ionization within said discharge tube; means, coupled to said tube, for inducing a main discharge within said tube, said main discharge inducing means comprising a magnetic core inductively coupled with said tube and with an electric power supply therefor; and means for reducing the electric field strength of said discharge tube comprising cadmium contained within said tube.
Claim 7
Dependent Claim
29 words
An apparatus according to claim 2, wherein said preliminary ionization inducing means comprises a pair of discharge electrodes disposed in said tube and connected to an additional power source.
Claim 8
Dependent Claim
38 words
An apparatus according to claim 2, wherein said discharge tube is a closed ring discharge tube, around which said core passes, said core including an inductive winding wound thereon and being connected to said electric power source therefor.
Claim 9
Dependent Claim
13 words
An apparatus according to claim 4, wherein said rare gas consists of xenon.
Claim 10
Dependent Claim
13 words
An apparatus according to claim 4, wherein said rare gas consists of argon.
Claim 11
Dependent Claim
26 words
An apparatus according to claim 4, wherein said vaporizable metal substance comprises at least one element selected from the group consisting of mercury, thallium and indium.
Claim 12
Dependent Claim
20 words
An apparatus according to claim 5, wherein said xenon gas is at a pressure greater than 300 millimeters of mercury.
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |