US3717487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic slip composition
Assignee: Sprague Electric Co
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Filing: 1970-06-17
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Granted: 1973-02-20
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Expires: 1990-06-17
Abstract
Abstract A new ceramic slip and an improved method for forming ceramic films and ceramic capacitors by passing a flat substrate through a falling sheet of the novel ceramic slip so as to receive a thin, uniform film of the ceramic slip. The substrate is either re-passed through said falling sheet one or more times to build up the desired thickness, dried and fired to maturity or the film is dried and alternate electrode-ceramic layers built-up in wellknown capacitor fashion.
Inventors
- 👤 T Hurley
- 👤 A Mcadams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:46
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/63424; C04B35/63432; C04B35/63448; C04B35/63488; C04B35/63492; H; H01; H01B; H01B3/00; H01B3/002; H01B3/006; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
122 words
A ceramic slip concentrate consisting essentially of a mixture having a Brookfield viscosity between 6000 - 15000 cps. of: a. 70 to 95 percent by weight of a powdered inorganic dielectric material selected from the group consisting of a titanate, a zirconate, a niobate, alumIna, porcelain and a ferrite; b. 10-30 percent by weight of a nonaqueous vehicle selected from the group consisting of xylene, amyl acetate and mixtures thereof; and c. a dispersing proportion of 0.2-3 percent by weight of a dispersing agent selected from the group consisting of polyethylene glycols, lecithin, polyoxyethylene isooctylphenyl ether, and polyoxyethylene nonylphenyl ether; said mixture having been milled to a fineness of grind of from 0-20 microns as measured on a fineness of grind gage.
Claim 2
Dependent Claim
122 words
A ceramic slip concentrate consisting essentially of a mixture having a Brookfield viscosity between 6000 - 15000 cps. of: a. 70 to 95 percent by weight of a powdered inorganic dielectric material selected from the group consisting of a titanate, a zirconate, a niobate, alumIna, porcelain and a ferrite; b. 10-30 percent by weight of a nonaqueous vehicle selected from the group consisting of xylene, amyl acetate and mixtures thereof; and c. a dispersing proportion of 0.2-3 percent by weight of a dispersing agent selected from the group consisting of polyethylene glycols, lecithin, polyoxyethylene isooctylphenyl ether, and polyoxyethylene nonylphenyl ether; said mixture having been milled to a fineness of grind of from 0-20 microns as measured on a fineness of grind gage.
Claim 3
Dependent Claim
57 words
The ceramic slip concentrate of claim 1 containing a binding proportion of 0.2 to 5 percent by weight of an organic binder selected from the group consisting of polystyrene, hydrogenated rosin, polymethacrylates, polybutylmethacrylates mixtures and copolymers thereof and additional nonaqueous vehicle to dilute the milled concentrate to form a mixture having a Brookfield viscosity between 300-1500 cps.
Claim 4
Dependent Claim
19 words
The ceramic slip of claim 1 wherein the vehicle consists of 70 percent xylene and 30 percent amyl acetate.
Claim 5
Dependent Claim
13 words
The ceramic slip of claim 3 wherein the dielectric material is a titanate.
Claim 6
Dependent Claim
17 words
The ceramic slip of claim 4 wherein the dispersing agent is lecithin and the binder is butylmethacrylate.
Claim 7
Dependent Claim
12 words
The ceramic slip of claim 1 wherein the dielectric material is alumina.
References Cited (Backward Citations)
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US2837487A
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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) | 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 |