Method for cleaning process control
US4905371A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 26, 1988 |
| Grant date | Mar 6, 1990 |
| Priority date | — |
| Expiry date | Aug 26, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49144
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for a cleaning process control is disclosed. The apparatus includes a printed wire circuit board that is made on a Pyrex glass or other transparent substrate. Components are attached to the printed wire circuit board and then the circuit card assembly which is formed is cleaned using a selected cleaning process. The circuit card assembly can then be inspected to determine the effectiveness of a particular cleaning process by flipping over the transparent circuit card, peering through the substrate to inspect for corrosion and solder balls. The circuit card assembly can then be cleaned more extensively and used again to check a different cleaning process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.