Patent US4049240A successfully refreshed from Google Patents.
US4497677A
Expired / Lapsed
US
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Method for manufacturing ceramic substrate
Assignee: Hitachi Ltd
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Filing: 1983-02-04
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Granted: 1985-02-05
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Expires: 2003-02-04
Abstract
Abstract A method for manufacturing a ceramic substrate, featured by pressing of the green sheet to reduce its dimensional change with time is provided. After this dimensional stabilization treatment, a conductor is printed on the surface of the green sheet and then the conductor-printed green sheet is sintered.
Inventors
- 👤 Sakae Sanada
- 👤 Yoshiyuki Ohzawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:41
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/51; C04B41/80; C04B41/81; C04B41/85; C04B41/88; H; H10; H10W; H10W70/00; H10W70/01; H10W70/05; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H05K3/00; H05K3/0011; H05K3/46; H05K3/4611; H05K3/4626; H05K3/4629
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
69 words
A method for manufacturing a ceramic substrate comprising the steps of: making a green sheet; pressing and heating said green sheet to a temperature of 20° to 250° C., the pressure applied during the pressing being within the range of 1 to 100 kg/cm 2 to effect dimensional stabilization of said green sheet; forming a conductor on the surface of said green sheet; and sintering the conductor-formed green sheet.
Claim 2
Independent Claim
69 words
A method for manufacturing a ceramic substrate comprising the steps of: making a green sheet; pressing and heating said green sheet to a temperature of 20° to 250° C., the pressure applied during the pressing being within the range of 1 to 100 kg/cm 2 to effect dimensional stabilization of said green sheet; forming a conductor on the surface of said green sheet; and sintering the conductor-formed green sheet.
Claim 3
Dependent Claim
27 words
The method of claim 1, wherein the pressure applied for the pressing of the green sheet is within the range of 3 to 20 kg/cm 2 .
Claim 4
Dependent Claim
26 words
The method of claim 2, wherein pressing of the green sheet is effected while heating the green sheet to a temperature of 70° to 150° C.
Claim 5
Dependent Claim
26 words
The method of claim 1, wherein pressing of the green sheet is effected while heating the green sheet to a temperature of 70° to 150° C.
Claim 6
Independent Claim
103 words
A method for manufacturing a ceramic substrate comprising the steps: making green sheets; pressing and heating each of said green sheets to a temperature of 20° to 250° C., the pressure applied during the pressing being within the range of 1 to 100 kg/cm 2 to effect dimensional stabilization of said green sheets; punching each of said green sheets for forming through-holes therein; forming a conductor on the surface and in said holes of each of said green sheets; laminating and bonding together a plurality of said green sheets formed with said conductor under heat and pressure; and sintering the laminated green sheets.
Claim 7
Independent Claim
103 words
A method for manufacturing a ceramic substrate comprising the steps: making green sheets; pressing and heating each of said green sheets to a temperature of 20° to 250° C., the pressure applied during the pressing being within the range of 1 to 100 kg/cm 2 to effect dimensional stabilization of said green sheets; punching each of said green sheets for forming through-holes therein; forming a conductor on the surface and in said holes of each of said green sheets; laminating and bonding together a plurality of said green sheets formed with said conductor under heat and pressure; and sintering the laminated green sheets.
Claim 8
Dependent Claim
26 words
The method of claim 5, wherein pressing of the green sheet is effected while heating the green sheet to a temperature of 70° to 150° C.
Claim 9
Dependent Claim
29 words
The method of claim 5, wherein the pressure applied for the pressing of each of said green sheets is within the range of 3 to 20 kg/cm 2 .
Claim 10
Dependent Claim
26 words
The method of claim 7, wherein pressing of the green sheet is effected while heating the green sheet to a temperature of 70° to 150° C.
Claim 11
Dependent Claim
36 words
The method of claim 5, wherein the pressure and the heating temperature employed during said laminating step are equal to or higher than those used for the pressing and heating of each of said green sheets.
Claim 12
Dependent Claim
21 words
The method of claim 5, wherein the green sheets are made from a mixture of alumina powders and volatile organic components.
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) | 1988-02-05 | 1988-08-06 | 1989-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-05 | 1992-08-06 | 1993-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-05 | 1996-08-06 | 1997-02-05 | $7700.00 | Window Closed / Lapsed |