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:
Dec. 03, 1996
Filed:
Apr. 29, 1994
John N Hait, Missoula, MT (US);
Progressive Technology Inc., Missoula, MT (US);
Abstract
A portable secure computer architecture, apparatus, and method for protecting information and at least one program for controlling that information is disclosed comprising: a computer protected inside of a single sealed cartridge, the computer having a CPU, Memory, and a communications means for communicating with a host computer outside of the cartridge. All internal information and external communications are exclusively controlled by the internal program. Provision is also made for running a second program inside the architecture, while protecting secure information from that second program. Secure information is placed in a bank switched subdivision of memory. The subdivision is switched off by the information controlling program before the second program is permitted to run. Reactivating the protected subdivision causes a simultaneous non-maskable interrupt halting the second program and transferring control back to the first program.