Uses of uniaxially electrically conductive articles
US5631447A · kind A · utility
6Cited by
14References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 3, 1995 |
| Grant date | May 20, 1997 |
| Priority date | — |
| Expiry date | Jan 3, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K2203/107
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Polymer (preferably polyimide) sheets (10) with laser ablated through-holes plated with metal (20) are used for making electrical conections to specified microcircuits, especially unbumped microchips and Tape Automated Bonding (TAB) articles. Bonding with different melting point materials at opposite ends of the plated holes is disclosed. Preferred polyimides are those derived from polymerisation of 4,4'-biphenyldianhydride and (4,4'-diaminobiphenyl, or 4,4'-diaminobiphenylether, or phylenediamine, preferably p-phenylenediamine).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.