Patent US2762718A successfully refreshed from Google Patents.
US4367265A
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Intergranular insulation type semiconductive ceramic and method of producing same
Assignee: Philips North America LLC
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Filing: 1981-04-06
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Granted: 1983-01-04
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Expires: 2001-04-06
Abstract
Abstract An intergranular insulation type semiconductive ceramic having a high effective dielectric constant includes an electrically insulating dielectric layer situated in the grain boundaries of an alkaline-earth metal titanate, zirconate, or combination thereof. The alkaline-earth metals are barium, strontium, and calcium. The dielectric layer is made of a mixture of bismuth oxide (Bi 2 O 3 ) and one or more metal oxides from nickel oxide (NiO), alumina (Al 2 O 3 ), and cuprous oxide (Cu 2 O).
Inventors
- 👤 Chyang J. Yu
- 👤 Hem P. Takiar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:02
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; C04B35/47; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1272; H01G4/1281
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
66 words
An intergranular insulation type dielectric body comprising: a polycrystalline, semiconductive ceramic having grain boundaries, said ceramic comprising an alkaline-earth metal titanate, zirconate, or a combination thereof, said alkaline-earth metal comprising one or more of barium, strontium, and calcium; and an electrically insulating dielectric layer situated in the grain boundaries of the ceramic; characterized in that the electrically insulating layer comprises Bi 2 O 3 and NiO.
Claim 2
Dependent Claim
66 words
An intergranular insulation type dielectric body comprising: a polycrystalline, semiconductive ceramic having grain boundaries, said ceramic comprising an alkaline-earth metal titanate, zirconate, or a combination thereof, said alkaline-earth metal comprising one or more of barium, strontium, and calcium; and an electrically insulating dielectric layer situated in the grain boundaries of the ceramic; characterized in that the electrically insulating layer comprises Bi 2 O 3 and NiO.
Claim 3
Dependent Claim
37 words
A dielectric body as claimed in claim 1, characterized in that in the electrically insulating dielectric layer, the ratio of NiO to Bi 2 O 3 is less than 2% by weight but is greater than 0%.
Claim 4
Dependent Claim
70 words
An intergranular insulation type dielectric body comprising: a polycrystalline, semiconductive ceramic having grain boundaries, said ceramic comprising an alkaline-earth metal titanate, zirconate, or a combination thereof, said alkaline-earth metal comprising one or more of barium, strontium, and calcium; and an electrically insulating dielectric layer situated in the grain boundaries of the ceramic; characterized in that the electrically insulating layer comprises Bi 2 O 3 and Al 2 O 3 .
Claim 5
Dependent Claim
70 words
An intergranular insulation type dielectric body comprising: a polycrystalline, semiconductive ceramic having grain boundaries, said ceramic comprising an alkaline-earth metal titanate, zirconate, or a combination thereof, said alkaline-earth metal comprising one or more of barium, strontium, and calcium; and an electrically insulating dielectric layer situated in the grain boundaries of the ceramic; characterized in that the electrically insulating layer comprises Bi 2 O 3 and Al 2 O 3 .
Claim 6
Dependent Claim
40 words
A dielectric body as claimed in claim 3, characterized in that in the electrically insulating dielectric layer, the ratio of Al 2 O 3 to Bi 2 O 3 is less than 1.5% by weight but is greater than 0%.
Claim 7
Dependent Claim
89 words
An intergranular insulation type dielectric body comprising: a polycrystalline, semiconductive ceramic having grain boundaries, said ceramic comprising an alkaline-earth metal titanate, zirconate, or a combination thereof, said alkaline-earth metal comprising one or more of barium, strontium, and calcium; and an electrically insulating dielectric layer situated in the grain boundaries of the ceramic; characterized in that the electrically insulating layer comprises Bi 2 O 3 and Cu 2 O, the ratio of Cu 2 O to Bi 2 O 3 being less than 1.5% by weight but greater than 0%.
Claim 8
Dependent Claim
89 words
An intergranular insulation type dielectric body comprising: a polycrystalline, semiconductive ceramic having grain boundaries, said ceramic comprising an alkaline-earth metal titanate, zirconate, or a combination thereof, said alkaline-earth metal comprising one or more of barium, strontium, and calcium; and an electrically insulating dielectric layer situated in the grain boundaries of the ceramic; characterized in that the electrically insulating layer comprises Bi 2 O 3 and Cu 2 O, the ratio of Cu 2 O to Bi 2 O 3 being less than 1.5% by weight but greater than 0%.
Claim 9
Dependent Claim
84 words
An intergranular insulation type dielectric body comprising: a polycrystalline, semiconductive ceramic having grain boundaries, said ceramic comprising an alkaline-earth metal titanate, zirconate, or a combination thereof, said alkaline-earth metal comprising one or more of barium, strontium, and calcium; and an electrically insulating dielectric layer situated in the grain boundaries of the ceramic; characterized in that the electrically insulating layer comprises Bi 2 O 3 and two or more metal oxides from the group comprising Cu 2 O, Al 2 O 3 , and NiO.
Claim 10
Dependent Claim
84 words
An intergranular insulation type dielectric body comprising: a polycrystalline, semiconductive ceramic having grain boundaries, said ceramic comprising an alkaline-earth metal titanate, zirconate, or a combination thereof, said alkaline-earth metal comprising one or more of barium, strontium, and calcium; and an electrically insulating dielectric layer situated in the grain boundaries of the ceramic; characterized in that the electrically insulating layer comprises Bi 2 O 3 and two or more metal oxides from the group comprising Cu 2 O, Al 2 O 3 , and NiO.
Claim 11
Dependent Claim
38 words
A dielectric body as claimed in claim 6, characterized in that in the electrically insulating dielectric layer, the ratio of metal oxide to Bi 2 O 3 is less than 1.5% by weight but is greater than 0%.
Claim 12
Dependent Claim
25 words
A dielectric body as claimed in claim 1, 2, 3, 4, 5, 6, or 7, characterized in that the semiconductive ceramic comprises SrTiO 3 .
Claim 13
Dependent Claim
26 words
A dielectric body as claimed in claim 8, characterized in that the semiconductive ceramic further comprises Nb 2 O 5 or Ta 2 O 5 .
Claim 14
Dependent Claim
22 words
A dielectric body as claimed in claim 9, characterized in that the semiconductive ceramic further comprises SiO 2 and SrCO 3 .
Claim 15
Dependent Claim
43 words
A dielectric body as claimed in claim 10, characterized in that the semiconductive ceramic is made from 98.67 weight percent SrTiO 3 , 0.056 weight percent SrCO 3 , 1.081 weight percent Nb 2 O 5 and 0.193 weight percent SiO 2 .
Claim 16
Independent Claim
83 words
A method of manufacturing an intergranular insulation type dielectric body from a polycrystalline, semiconductive ceramic body having grain boundaries, said ceramic comprising an alkaline-earth metal titanate, zirconate, or a combination thereof, said alkaline-earth metal comprising one or more of barium, strontium, and calcium, said method comprising the steps of: coating at least a part of the surface of the ceramic body with a mixture of Bi 2 O 3 and NiO; and diffusing the coating into the grain boundaries of the ceramic body.
Claim 17
Independent Claim
83 words
A method of manufacturing an intergranular insulation type dielectric body from a polycrystalline, semiconductive ceramic body having grain boundaries, said ceramic comprising an alkaline-earth metal titanate, zirconate, or a combination thereof, said alkaline-earth metal comprising one or more of barium, strontium, and calcium, said method comprising the steps of: coating at least a part of the surface of the ceramic body with a mixture of Bi 2 O 3 and NiO; and diffusing the coating into the grain boundaries of the ceramic body.
Claim 18
Dependent Claim
33 words
A method as claimed in claim 12, characterized in that the ratio of NiO to Bi 2 O 3 in the coating is less than 2% by weight but is greater than 0%.
Claim 19
Independent Claim
87 words
A method of manufacturing an intergranular insulation type dielectric body from a polycrystalline, semiconductive ceramic body having grain boundaries, said ceramic comprising an alkaline-earth metal titanate, zirconate, or a combination thereof, said alkaline-earth metal comprising one or more of barium, strontium, and calcium, said method comprising the steps of: coating at least a part of the surface of the ceramic body with a mixture of Bi 2 O 3 and Al 2 O 3 ; and diffusing the coating into the grain boundaries of the ceramic body.
Claim 20
Independent Claim
87 words
A method of manufacturing an intergranular insulation type dielectric body from a polycrystalline, semiconductive ceramic body having grain boundaries, said ceramic comprising an alkaline-earth metal titanate, zirconate, or a combination thereof, said alkaline-earth metal comprising one or more of barium, strontium, and calcium, said method comprising the steps of: coating at least a part of the surface of the ceramic body with a mixture of Bi 2 O 3 and Al 2 O 3 ; and diffusing the coating into the grain boundaries of the ceramic body.
Claim 21
Dependent Claim
36 words
A method as claimed in claim 14, characterized in that the ratio of Al 2 O 3 to Bi 2 O 3 in the coating is less than 1.5% by weight but is greater than 0%.
Claim 22
Independent Claim
106 words
A method of manufacturing an intergranular insulation type dielectric body from a polycrystalline, semiconductive ceramic body having grain boundaries, said ceramic comprising an alkaline-earth metal titanate, zirconate, or a combination thereof, said alkaline-earth metal comprising one or more of barium, strontium, and calcium, said method comprising the steps of: coating at least a part of the surface of the ceramic body with a mixture of Bi 2 O 3 and Cu 2 O, the ratio of Cu 2 O to Bi 2 O 3 being less than 1.5% by weight but greater than 0%; and diffusing the coating into the grain boundaries of the ceramic body.
Claim 23
Independent Claim
106 words
A method of manufacturing an intergranular insulation type dielectric body from a polycrystalline, semiconductive ceramic body having grain boundaries, said ceramic comprising an alkaline-earth metal titanate, zirconate, or a combination thereof, said alkaline-earth metal comprising one or more of barium, strontium, and calcium, said method comprising the steps of: coating at least a part of the surface of the ceramic body with a mixture of Bi 2 O 3 and Cu 2 O, the ratio of Cu 2 O to Bi 2 O 3 being less than 1.5% by weight but greater than 0%; and diffusing the coating into the grain boundaries of the ceramic body.
Claim 24
Dependent Claim
21 words
A method as claimed in claim 12, 13, 14, 15, or 16, characterized in that the coating is an amorphous frit.
Claim 25
Dependent Claim
21 words
A method as claimed in claim 17, characterized in that the diffusing step comprises heating the coated ceramic body in air.
Claim 26
Dependent Claim
24 words
A method as claimed in claim 18, characterized in that the coated ceramic body is heated to approximately 1100°-1150° C. for approximately 2.5 hours.
Claim 27
Dependent Claim
18 words
A method as claimed in claim 19, characterized in that the initial ceramic body comprises SrTiO 3 .
Claim 28
Dependent Claim
25 words
A method as claimed in claim 20, characterized in that the ratio of the quantity of coating to ceramic material is approximately 10 weight %.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-03 | 1986-07-05 | 1987-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-03 | 1990-07-05 | 1991-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-03 | 1994-07-05 | 1995-01-04 | $7700.00 | Window Closed / Lapsed |