Patent ID: 9717150
Date: 2017-07-25
CPC Classifications: B32B,C04B,H05K,Y10T

Claim:
1. A method of fabricating a biocompatible hermetic housing, comprising the steps of: providing a ceramic sheet having a sheet upper surface and a sheet lower surface and a thickness of less than or equal to 40 mils; forming a plurality of vias in said ceramic sheet extending straight from said sheet upper surface to said sheet lower surface and having a center to center pitch less than or equal to 40 mils; inserting an electrically conductive thick film past by drawing the thick film past with vacuum into said plurality of vias, said thick film paste comprising ceramic and metal wherein the ceramic has a higher glass content then said ceramic sheet and said metal is selected from the group consisting of platinum, titanium, palladium, tantalum, and niobium; laminating said ceramic sheet between an upper ceramic sheet containing no aligned vias and a lower ceramic sheet containing no aligned vias, using a heatpress forming a laminated ceramic substrate; firing said laminated ceramic substrate under compression to a temperature to sinter said laminated ceramic substrate and shrink said plurality of vias to compress said thick film paste, forming a single sintered structure comprised of said ceramic sheet, said upper ceramic sheet and said lower ceramic sheet, and forming a metalized via and a hermetic seal between said metalized via and said laminated ceramic substrate; grinding said upper ceramic sheet and said lower ceramic sheet from said single sintered structure exposing an upper and a lower surface of said metalized via and forming a ceramic substrate having a substrate upper surface and a substrate lower surface with hermetic vias extending straight from said substrate upper surface to said substrate lower surface; and polishing the substrate upper surface and substrate lower surface so the metalized vias are flush with the substrate upper surface and substrate lower surface; and forming a housing enclosing electronics using the ceramic substrate as a wall.