US4922099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric field device
Assignee: Niterra Co Ltd
•
Filing: 1988-01-03
•
Granted: 1990-05-01
•
Expires: 2008-01-03
Abstract
Abstract An electric field device is obtained by the steps of employing a highly pure and mechanically electrically chemically and thermally extremely durable ceramic material, such as a high purity alumina porcelain, as a dielectric material, disposing electrodes on the shaped material before sintering by a thick film printing technique, such as screen printing, with a dispersion ink of finely divided metal, e.g. tungsten, and sintering the shaped material integrally with the electrodes. The product is extremely dense, mechanically electrically chemically and thermally durable and highly reliable.
Inventors
- 👤 Senichi Masuda
- 👤 Isamu Fukuura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:12
CPC Classifications
H; H05; H05F; H05F3/00; H05F3/04; D; D06; D06M; D06M10/00; D06M10/02; D06M10/025; B; B03; B03C; B03C7/00; B03C7/02; B03C7/04; B05; B05B; B05B5/00; B05B5/025; B05B5/03; B05B5/032; B05B5/043; B05B5/08; B05B5/087; B05B5/088; B65; B65G; B65G54/00; B65G54/02; G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0822; H01; H01T; H01T19/00
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
208 words
An electric field device comprising: an upper and a lower sheet; said sheets made of the fine ceramic material and joined in a unitary body; an elongated corona discharge electrode provided on an upper surface of said upper sheet; a planar induction electrode provided between said upper sheet and said lower sheet subjacent said corona discharge electrode; surface means defining a hole through said lower sheet remote from the lateral edges thereof; a contacting conductor comprising a film-like coating of an electrically-conducting material formed concentrically with said hole on the upper surface of said lower sheet; a terminal conductor comprising a film-like coating of an electrically-conductive material formed concentrically with said hole on the lower surface of said lower sheet; conductor comprising an electrically-conductive material extending from said planar induction electrode through said hole to said terminal conductor, said conductor being integrally bonded to said planar induction electrode, said contacting conductor and said terminal conductor; wherein the electrically-conductive material of said contacting conductor, said terminal conductor and said conductor is the same, and said electrically-conductive material has a coefficient of expansion which is reasonably compatible with the coefficient of expansion of said fine ceramic material; and a power supply connected between said terminal and said corona discharge electrode.
Claim 2
Dependent Claim
208 words
An electric field device comprising: an upper and a lower sheet; said sheets made of the fine ceramic material and joined in a unitary body; an elongated corona discharge electrode provided on an upper surface of said upper sheet; a planar induction electrode provided between said upper sheet and said lower sheet subjacent said corona discharge electrode; surface means defining a hole through said lower sheet remote from the lateral edges thereof; a contacting conductor comprising a film-like coating of an electrically-conducting material formed concentrically with said hole on the upper surface of said lower sheet; a terminal conductor comprising a film-like coating of an electrically-conductive material formed concentrically with said hole on the lower surface of said lower sheet; conductor comprising an electrically-conductive material extending from said planar induction electrode through said hole to said terminal conductor, said conductor being integrally bonded to said planar induction electrode, said contacting conductor and said terminal conductor; wherein the electrically-conductive material of said contacting conductor, said terminal conductor and said conductor is the same, and said electrically-conductive material has a coefficient of expansion which is reasonably compatible with the coefficient of expansion of said fine ceramic material; and a power supply connected between said terminal and said corona discharge electrode.
Claim 3
Dependent Claim
40 words
The electric field device in claim 1 in which said electrically-conducting material is in particulate form as a result of depositing a dispersion of particles of said electrically-conducting material on said surface means prior to sintering of said lower sheet.
Claim 4
Dependent Claim
23 words
The electric field device in claim 1 in which said conductor is plated with a material capable of inhibiting oxidation of said electrodes.
Claim 5
Dependent Claim
18 words
The electric field device in claim 3 in which said material capable of inhibiting oxidation is a metal.
Claim 6
Dependent Claim
21 words
The electric field device in claim 3 in which said material capable of inhibiting oxidation is an insulator film of alumina.
Claim 7
Dependent Claim
15 words
The electric field device in claim 1 in which said electrically-conducting material is carbon fibers.
Claim 8
Dependent Claim
16 words
The electric field device in claim 1 in which said electrically-conducting material is semiconductor ceramic material.
Claim 9
Dependent Claim
66 words
The electric field device in claim 1 including another conductor and another conducting terminal, said another conductor comprising a film-like coating of an electrically-conducting material integrally bonded with said upper and lower surfaces and extending from said corona discharge electrode to said lower surface and said another conducting terminal is disposed on said lower surface and connected to said corona discharge electrode by said another conductor.
Claim 10
Dependent Claim
16 words
The electric field device in claim 1 in which said hole and said terminal are circular.
Claim 11
Dependent Claim
28 words
The electric field device in claim 9 in which said hole has a diameter of approximately 1 mm and said terminal has a diameter of approximately 10 mm.
Claim 12
Dependent Claim
260 words
A sintered ceramic electric field device comprising: an upper and a lower sheet, said sheets made of unsintered fine ceramic material and joined to form a unitary body; an elongated corona discharge electrode provided on an upper surface of said upper sheet and formed as a film-like coating of an electrically-conducting material integrally bonded with said upper surface; a planar induction electrode provided between said upper sheet and said lower sheet subjacent said corona discharge electrode, said induction electrode being a film-like coating of an electrically-conducting material having a melting point substantially above the sintering temperature of said fine ceramic material, said induction electrode being integrally bonded after sintering of said body with at least one of a lower surface of said upper sheet and an upper surface of said lower sheet; surface means defining a hole through said lower sheet remote from the lateral edges thereof; a conductor comprising a film-like coating of an electrically-conducting material integrally bonded with said surface means after sintering and extending from said induction electrode through said hole to the lower surface of said lower sheet; said electrically-conducting material having a coefficient of expansion that is substantially compatible with that of said fine ceramic material whereby repeated changes in the thermal energy level of the device will not result in delamination of the conductor from the sheet to which it is bonded or rupture the continuity of the conductor; and power supply connecting means electrically connected with said conductor for electrically connecting an external power supply with said conductor and said corona discharge electrode.
Claim 13
Dependent Claim
260 words
A sintered ceramic electric field device comprising: an upper and a lower sheet, said sheets made of unsintered fine ceramic material and joined to form a unitary body; an elongated corona discharge electrode provided on an upper surface of said upper sheet and formed as a film-like coating of an electrically-conducting material integrally bonded with said upper surface; a planar induction electrode provided between said upper sheet and said lower sheet subjacent said corona discharge electrode, said induction electrode being a film-like coating of an electrically-conducting material having a melting point substantially above the sintering temperature of said fine ceramic material, said induction electrode being integrally bonded after sintering of said body with at least one of a lower surface of said upper sheet and an upper surface of said lower sheet; surface means defining a hole through said lower sheet remote from the lateral edges thereof; a conductor comprising a film-like coating of an electrically-conducting material integrally bonded with said surface means after sintering and extending from said induction electrode through said hole to the lower surface of said lower sheet; said electrically-conducting material having a coefficient of expansion that is substantially compatible with that of said fine ceramic material whereby repeated changes in the thermal energy level of the device will not result in delamination of the conductor from the sheet to which it is bonded or rupture the continuity of the conductor; and power supply connecting means electrically connected with said conductor for electrically connecting an external power supply with said conductor and said corona discharge electrode.
Claim 14
Dependent Claim
40 words
The electric field device in claim 11 in which said electrically-conducting material is in particulate form as a result of depositing a dispersion of particles of said electrically-conducting material on the surface adjacent thereto prior to sintering of said device.
Claim 15
Dependent Claim
26 words
The electric field device in claim 11 in which said electrodes and said conductor are made from tungsten and said fine ceramic material is alumina porcelain.
Claim 16
Dependent Claim
28 words
The electric field in claim 11 in which exposed areas of said electrodes and said conductors are plated with a material capable of inhibiting oxidation of said electrodes.
Claim 17
Dependent Claim
18 words
The electric field device in claim 14 in which said material capable of inhibiting oxidation is a metal.
Claim 18
Dependent Claim
20 words
The electric field device in claim 14 in which said material capable of inhibiting oxidation is an alumina insulator film.
Claim 19
Dependent Claim
15 words
The electric field device in claim 11 in which said electrically-conducting material is carbon fibers.
Claim 20
Dependent Claim
17 words
The electric field device in claim 11 in which said electrically conducting material is semiconductor ceramic material.
References Cited (Backward Citations)
US3004197A
Cited
US3615980A
Cited
US3930815A
Cited
US3841264A
Cited
US3801869A
Cited
US3882059A
Cited
US3970905A
Cited
JPS51103328A
Cited
US3968405A
Cited
GB1549055A
Cited
DE2618243A1
Cited
JPS52106400A
Cited
JPS52108574A
Cited
US4150876A
Cited
JPS52145838A
Cited
US4155093A
Cited
US4210949A
Cited
JPS5442017A
Cited
JPS5473106A
Cited
JPS5481125A
Cited
US4325763A
Cited
JPS5547574A
Cited
JPS5583218A
Cited
JPS55154383A
Cited
US4265641A
Cited
JPS5648666A
Cited
JPS56155419A
Cited
JPS576385A
Cited
JPS5781779A
Cited
JPS57129856A
Cited
US4465727A
Cited
JPS57132134A
Cited
US4497677A
Cited
US4652318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |