US4024629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabrication techniques for multilayer ceramic modules
Assignee: International Business Machines Corp
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Filing: 1975-11-26
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Granted: 1977-05-24
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Expires: 1995-11-26
Abstract
Abstract Metallized through-holes are provided in insulating substrates by placing the substrate onto an absorbant carrier and screening a metallization paste, which contains a metal component dispersed in an organic solvent, into the holes. The carrier absorbs the solvent and a portion of the paste adheres to the carrier. When the carrier is stripped from the substrate it carries with it the center portion of the paste to leave a thin layer of paste on the inner surface of the substrate.
Inventors
- 👤 Jean Marie Lemonie
- 👤 Jean Luc Mathis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:25
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/01; H10W70/05; H10W70/095; B; B61; B61L; B61L25/00; B61L25/02; B61L25/04; B61L25/045; H05; H05K; H05K1/00; H05K1/02; H05K1/11; H05K1/111; H05K1/112; H05K3/00; H05K3/40; H05K3/4038; H05K3/4053; H05K3/4061; H10W70/60; H10W70/611; H10W70/67; H10W70/68; H10W70/685; H05K1/03; H05K1/0306; H05K1/09; H05K1/092; H05K2201/00; H05K2201/09; H05K2201/09209; H05K2201/09372; H05K2201/09472; H05K2201/095; H05K2201/096; H05K2201/09818; H05K2201/09981; H05K2203/00; H05K2203/01; H05K2203/0147; H05K2203/0156; H05K2203/0191; H05K3/30; H05K3/32; H05K3/34; H05K3/341; H05K3/3421; H05K3/46; H05K3/4611; H05K3/4614; H05K3/4626; H05K3/4629; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/49155; Y10T29/49165
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
103 words
A method of metallizing the surface of through-holes in an insulating sheet comprising the steps of: a. placing said sheet onto an absorbent carrier; b. filling said through-holes with a metallization paste containing a metal component dispersed in an organic solvent, which solvent is absorbable by said carrier; c. stripping said sheet from said carrier such that the center part of said paste which fills said through-holes adheres to and is removed along with the carrier to leave a thin layer of paste on the inner surface of said through-holes; and d. heating said sheet to convert said paste to the metal state.
Claim 2
Independent Claim
103 words
A method of metallizing the surface of through-holes in an insulating sheet comprising the steps of: a. placing said sheet onto an absorbent carrier; b. filling said through-holes with a metallization paste containing a metal component dispersed in an organic solvent, which solvent is absorbable by said carrier; c. stripping said sheet from said carrier such that the center part of said paste which fills said through-holes adheres to and is removed along with the carrier to leave a thin layer of paste on the inner surface of said through-holes; and d. heating said sheet to convert said paste to the metal state.
Claim 3
Dependent Claim
147 words
In a method of metallizing the inner surface of a through-hole punched in a green ceramic sheet, in which the metallization is formed using a screening paste comprising a metal component in dispersion in an organic vehicle which includes a solvent component, the steps of: a. applying a green ceramic sheet, into which at least one through-hole has been punched, onto a carrier which is capable of absorbing the solvent component of said vehicle, b. applying a screening mask including an opening corresponding to said through-hole onto said sheet, c. filling said through-hole with said paste through said mask, d. removing said mask, and e. stripping said ceramic sheet from said carrier, such that the center part of said paste which fills said through-hole adheres to and is removed along with the carrier to leave a thin layer of paste on the inner surface of said through-hole.
Claim 4
Dependent Claim
147 words
In a method of metallizing the inner surface of a through-hole punched in a green ceramic sheet, in which the metallization is formed using a screening paste comprising a metal component in dispersion in an organic vehicle which includes a solvent component, the steps of: a. applying a green ceramic sheet, into which at least one through-hole has been punched, onto a carrier which is capable of absorbing the solvent component of said vehicle, b. applying a screening mask including an opening corresponding to said through-hole onto said sheet, c. filling said through-hole with said paste through said mask, d. removing said mask, and e. stripping said ceramic sheet from said carrier, such that the center part of said paste which fills said through-hole adheres to and is removed along with the carrier to leave a thin layer of paste on the inner surface of said through-hole.
Claim 5
Dependent Claim
25 words
Method in accordance with claim 2, wherein said mask includes further openings for forming surface conductors on said sheet by the screening of said paste.
Claim 6
Dependent Claim
39 words
Method in accordance with claim 3, wherein said paste is a mixture of powdered molybdenum (70%) and a glass frit (30%), and of an organic vehicle comprised of butyl carbitol acetate (75%), ethyl cellulose (20%), and N-acylated sarcosine, (5%).
Claim 7
Dependent Claim
24 words
Method in accordance with claim 4 wherein said carrier consists of paper, which material is highly absorbent with respect to the butyl carbitol acetate.
Claim 8
Dependent Claim
99 words
The method of claim 2 including the steps of: a. forming a plurality of sheets having through-holes coated with screening paste. b. filling said through-holes with an organic paste capable of being volatilized during a subsequent sintering step, c. aligning and stacking said sheets together such that the through-holes are aligned at desired locations, and d. laminating and sintering the aligned and stacked sheets to volatilize said organic paste, densify the ceramic and fire said screening paste, thereby forming a multilayer module having a cavity the inner surface of which is metallized and which can accommodate a connection pin.
Claim 9
Dependent Claim
13 words
The method of claim 6 wherein said organic paste is a cellulose paste.
Claim 10
Dependent Claim
61 words
The method of claim 6 in which prior to step (d), at least one green ceramic sheet is added to said stacked sheets which sheet includes a through-hole which is metallized by means of a conventional technique and the diameter of which is smaller than that of the holes forming said cavity, so as to close one end of said cavity.
Claim 11
Dependent Claim
39 words
The method of claim 8 wherein said green ceramic sheet which includes a through-hole which is metallized by means of a conventional technique is further provided with a metal abutment intended to support the base of a connection pin.
Claim 12
Dependent Claim
21 words
Method of claim 9 wherein a connection pin is bonded to the cavity thus formed in order to complete said module.
Claim 13
Dependent Claim
13 words
Method of claim 10 wherein said connection pin is brazed using a metal.
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) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |