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. 10, 1991
Filed:
Apr. 26, 1991
Alan G Thiele, San Diego, CA (US);
Ronald L Williams, San Marcos, CA (US);
Hughes Aircraft Company, Los Angeles, CA (US);
Abstract
A secure circuit structure includes a pair of opposed substrates having a volatile circuit fabricated on at least one, and preferably both substrates. A maintenance circuit for the volatile circuit extends between the substrates so that it is interrupted, thereby altering the volatile circuit and rendering reverse engineering attempts futile, if the substrates are moved with respect to each other by opening the circuit package. The maintenance circuit preferably includes a series of mating conductive indium bumps that extend from the opposed substrates and mechanically bond the substrates together. The secured volatile circuit may be a random access memory storing an access code, maintained by a battery power supply circuit.