Process for recycling a substrate from an integrated circuit package
US6271048A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 2000 |
| Grant date | Aug 7, 2001 |
| Priority date | — |
| Expiry date | Oct 20, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/19043
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
An integrated circuit package is processed by a grinding step, a dissolving step, and a disintegrating step. The grinding step grinds an IC-chip completely off of a substrate, and it also grinds a first portion of a filler layer and a first portion of a set of solder balls which attach the IC-chip to the substrate. This leaves a partial filler layer and partial solder balls on the substrate. The dissolving step dissolves the partial filler layer off of the substrate after the grinding step; and the disintegration step disintegrates at least part of each partial solder ball by subjecting the partial solder balls on the substrate to ultrasonic vibration after the dissolving step. These steps leave the substrate with small solder mounds that can be easily attached to another IC-chip with another set of solder balls.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.