The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 16, 1993
Filed:
Apr. 01, 1991
Mark A Smith, Rochester, NY (US);
Kitty Sathi, Pittsford, NY (US);
Jack T Latone, Rochester, NY (US);
Xerox Corporation, Stamford, CT (US);
Abstract
A method is provided for preserving the integrity of a memory in an electronic printer in the event that a printed wiring board with non-volatile memory is replaced. The memory includes plural disks providing permanent data storage and the non-volatile memory communicating with the disks. In the method, a processor identifier is provided with the printed wiring board. A time stamp indicating the date of installation of the printed wiring board is generated, and the processor identifier of the printed wiring board is combined with the time stamp to provide an identifier seal. Copies of the identifier seal are stored to each of the disks. The processor identifier of the printed wiring board is compared with the processor identifiers of the respective identifier seals of the disks in response to booting the processor. When the processor identifier on the printed wiring board is substantially different from one of the processor identifiers of the disks, the printed wiring board is replaced and the transfer of data between the non-volatile memory and the disks is inhibited until the processor identifier of the replaced wiring board and the processor identifiers of the disks correspond substantially.