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:
Jun. 27, 1989
Filed:
Sep. 24, 1987
Applicant:
Inventors:
Dewitt Ong, Tempe, AZ (US);
Scott Rider, Chandler, AZ (US);
Assignee:
Intel Corporation, Santa Clara, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ; H01L / ;
U.S. Cl.
CPC ...
437 51 ; 437 45 ; 365185 ;
Abstract
A technique of modifying a ROM mask to prevent external access of internal memory of an integrated circuit device. Patterns in the ROM mask are altered to permit implantation of components of a driver circuit such that these driver circuits are disabled. Disabling of the driver circuit prevents control signals from permitting external access of internal memory, therein allowing copy protection of the contents of the internal memory.