Method for making ceramic substrates from thin and thick ceramic greensheets
US5601672A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1994 |
| Grant date | Feb 11, 1997 |
| Priority date | — |
| Expiry date | Nov 1, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1056
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Method for producing ceramic laminates from a plurality of greensheet layers which include one or more thin greensheet layers, e.g. having a thickness less than about 3 mils, with interposed patterned circuit layers and conductive vias, while avoiding the loss of strength and the distortion encountered when paste compositions are pre-applied to such thin greensheet layers. The invention avoids the aforementioned problems by the use of a plurality of greensheet layers including thicker, paste-resistant greensheet layers having a thickness greater than the thin greensheet layer, e.g., between 5 and 10 mils, each pair of the thicker greensheet layers confining therebetween an unscreened thin greensheet layer, one of the thicker greensheet layers also being screened with the circuit pattern layer normally applied to the interposed thin greensheet layer. Thereafter the superposed layers are laminated and sintered to form the composite.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.