Process control device and process control method using a medium with rewritable marking technique
US6595428B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 2000 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | May 27, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P90/02
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A process control method allowing an operator to readily confirm an order of operation processes includes steps of: reading magnetic data of a control card when the control card is inserted; transmitting completion data based on a lot number identified from read magnetic data to a host computer; receiving update data by the host computer; writing next process data in the received data as a visually recognizable image on the control card; and writing the next process data as a visually recognizable image based on process data identified by the read magnetic data when a predetermined time period passes without receiving update data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.