Thomas J Kline

US Patent:

54784204, Dec 26, 1995

Filed:

Jul 28, 1994

Appl. No.:

8/281715

Inventors:

John P. Gauci - Putnam Valley NY
Thomas A. Kline - Wappingers Falls NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

B32B 3104
B32B 3120
B32B 3126

US Classification:

156 89

Abstract:

A multilayer ceramic substrate with an internal cavity extending from the top to the bottom surface of the substrate is produced using an insert material which fits within a cavity defined by aligned openings of individual ceramic sheets in a multilayer stack. The multilayer stack of ceramic sheets, together with the insert, is press-molded together with the insert serving as an internal mold that maintains the internal dimensions of the cavity. The insert is slightly larger in its top to bottom dimension than the multilayer stack and is driven into a compressible material underlying the multilayer stack during the pressing operation. The insert prevents the ceramic from flowing upwards into the center of the cavity during the pressing operation. In addition, the insert embeds electrically conductive pads located at various levels inside the cavity on individual ceramic sheets in the multilayer stack into the top surfaces of the ceramic sheets. After molding, the insert and the compressible material are removed from the multilayer structure.

Author:

Thomas Kline

ISBN #:

0533087805

Author:

Thomas J. Kline

ISBN #:

0231036086