Password protected memory on replaceable components for printing devices
US6738903B1 · kind B1 · utility
181Cited by
7References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 10, 2000 |
| Grant date | May 18, 2004 |
| Priority date | — |
| Expiry date | Jan 10, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2221/1823
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A printing device component having a memory tag with password protected data areas to control read and write access to the memory tag. The memory tag provides an encrypted authorization code to a printing device into which the component is installed. The printing device determines if the authorization code is valid and, if so, the printing device enables all printing device functions. Otherwise, limited functions are enabled. The memory tag utilizes encryption methods to allow only authorized user access to read from and write to selected data areas of the memory tag.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.