Patent US4209477A successfully refreshed from Google Patents.
US4209477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing a film of densely packed structure
Assignee: Mitsubishi Mining and Cement Co Ltd
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Filing: 1978-01-23
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Granted: 1980-06-24
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Expires: 1998-01-23
Abstract
Abstract A process for preparing dielectric or semiconductive films which have densely packed structures. In a process comprising spreading a powdery ceramic material suspended in a binder and solvent on to a base plate to form a thin layer and subjecting the layer to firing, the improvement being provisionally firing the thin layer to remove the binder and solvent, cooling the resulting thin layer, covering the thin layer with an organic film, compressing the thin layer and the film to densely pack the thin layer and to adhere the thin layer to the film, prior to the firing.
Inventors
- 👤 Hiroaki Yanagida
- 👤 Masayuki Nagai
- 👤 Tadao Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:48
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/63416; C04B33/00; C04B33/32; C04B35/63424; C04B35/63432; C04B35/636; C04B35/6365; C04B35/638; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H10; H10W; H10W99/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
195 words
A process of preparing a densely packed ceramic film from a powdered ceramic which comprises: mixing the powdered ceramic with an organic binder dissolved in a solvent to form a homogenous mixture; spreading the homogenous mixture on to a base plate to form a thin layer of said mixture on said base plate; provisionally firing said thin layer of said mixture at from about 300° to about 900° C. to remove by evaporation and decomposition said organic binder and said solvent from said thin layer; cooling the provisionally fired thin layer; covering said provisionally fired thin layer with an organic film to form a sandwich wherein said provisionally fired thin layer is between said organic film and said base plate; compressing said sandwich of film, thin layer and base plate at a pressure of about 0.5 to about 10,000 Kg/cm 2 to densely pack the thin layer and to adhere said densely packed thin layer to said organic film; and heating said densely packed thin layer adhering to said film at from about 1000° to about 1600° C. to sinter said densely packed thin layer and to remove said organic film by evaporation and decomposition.
Claim 2
Dependent Claim
195 words
A process of preparing a densely packed ceramic film from a powdered ceramic which comprises: mixing the powdered ceramic with an organic binder dissolved in a solvent to form a homogenous mixture; spreading the homogenous mixture on to a base plate to form a thin layer of said mixture on said base plate; provisionally firing said thin layer of said mixture at from about 300° to about 900° C. to remove by evaporation and decomposition said organic binder and said solvent from said thin layer; cooling the provisionally fired thin layer; covering said provisionally fired thin layer with an organic film to form a sandwich wherein said provisionally fired thin layer is between said organic film and said base plate; compressing said sandwich of film, thin layer and base plate at a pressure of about 0.5 to about 10,000 Kg/cm 2 to densely pack the thin layer and to adhere said densely packed thin layer to said organic film; and heating said densely packed thin layer adhering to said film at from about 1000° to about 1600° C. to sinter said densely packed thin layer and to remove said organic film by evaporation and decomposition.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein the densely packed thin layer adhering to the organic film is separated from the base plate prior to sintering.
Claim 4
Dependent Claim
25 words
The process of claim 2 wherein the densely packed thin layer adhering to the organic film is cut to a final shape prior to sintering.
Claim 5
Dependent Claim
22 words
The process of claim 1 wherein the organic binder is selected from the group consisting of polyvinyl alcohol, polyacrylate, polystyrene or methylcellulose.
Claim 6
Dependent Claim
15 words
The process of claim 4 wherein the organic binder is selected from polystyrene or methylcellulose.
Claim 7
Dependent Claim
28 words
The process of claim 1 wherein the organic film is selected from a film of the group consisting of polyvinyl alcohol, polyacrylate, polystyrene, methylcellulose, polyethylene or polyfluoro carbons.
Claim 8
Dependent Claim
17 words
The process of claim 6 wherein the organic film is a film selected from polystyrene or methylcellulose.
Claim 9
Dependent Claim
14 words
The process of claim 7 wherein the solvent is chosen from tetrahydrofuran or water.
Claim 10
Dependent Claim
17 words
The process of claim 1 wherein said provisional firing is for about 0.5 to about 10 hours.
Claim 11
Dependent Claim
17 words
The process of claim 1 wherein said provisional firing is at a temperature of about 600° C.
Claim 12
Dependent Claim
21 words
The process of claim 9 wherein said provisional firing is at a temperature of about 600° C. for about one hour.
Claim 13
Dependent Claim
19 words
The process of claim 1 wherein said sintering is at a temperature of about 1200° to about 1400° C.
Claim 14
Dependent Claim
16 words
The process of claim 1 wherein said sintering is for about 0.5 to about 168 hours.
Claim 15
Dependent Claim
21 words
The process of claim 1 wherein said compression is at a pressure of about 500 to about 1,000 Kg/cm 2 .
Claim 16
Dependent Claim
16 words
The process of claim 1 wherein said covering and compression steps are repeated at least once.
Claim 17
Dependent Claim
19 words
The process of claim 15 wherein the composite layer is separated from the first base plate prior to sintering.
Claim 18
Dependent Claim
18 words
The process of claim 16 wherein th composite layer is cut to a final shape prior to sintering.
Claim 19
Dependent Claim
29 words
The process of claim 3 wherein the shaped densely packed thin layer adhering to the organic film is mounted onto a portion of an electronic component prior to sintering.
Claim 20
Dependent Claim
162 words
In the process of preparing ceramic films wherein a powdery ceramic material suspended in a binder and solvent is spread in a thin layer onto a base plate and then fired the improvement comprising: provisionally firing the thin layer at from about 300° to 900° C. to remove by evaporation and decomposition the binder and the solvent from the thin layer; cooling the provisionally fired thin layer; covering said provisionally fired thin layer with an organic film to form a sandwich wherein said provisionally fired thin layer is between said organic film and the base plate; compressing said sandwich of film, thin layer and base plate at a pressure of about 0.5 to about 10,000 Kgcm 2 to densely pack the thin layer and to adhere the densely packed thin layer to said organic film; firing said densely packed thin layer adhering to said film at from about 1000° to about 1600° C. to remove said organic film by evaporation and decomposition.
Claim 21
Dependent Claim
162 words
In the process of preparing ceramic films wherein a powdery ceramic material suspended in a binder and solvent is spread in a thin layer onto a base plate and then fired the improvement comprising: provisionally firing the thin layer at from about 300° to 900° C. to remove by evaporation and decomposition the binder and the solvent from the thin layer; cooling the provisionally fired thin layer; covering said provisionally fired thin layer with an organic film to form a sandwich wherein said provisionally fired thin layer is between said organic film and the base plate; compressing said sandwich of film, thin layer and base plate at a pressure of about 0.5 to about 10,000 Kgcm 2 to densely pack the thin layer and to adhere the densely packed thin layer to said organic film; firing said densely packed thin layer adhering to said film at from about 1000° to about 1600° C. to remove said organic film by evaporation and decomposition.
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) | 1983-06-24 | 1983-12-24 | 1984-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-24 | 1987-12-24 | 1988-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-24 | 1991-12-24 | 1992-06-24 | $7700.00 | Window Closed / Lapsed |