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:
Feb. 08, 1983
Filed:
Sep. 14, 1981
Al F Tasch, Jr, Richardson, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A semiconductor read-only-memory (ROM) device having an array of punch-through devices as memory cells. The cells are formed at the crossing points of two pluralities of parallel elongated regions, the two pluralities being perpendicular to each other. One plurality is located in subsurface regions of a semiconductor body and is of a conductivity type opposite that of the surrounding body. The other plurality is located at a surface of the semiconductor body and is of the same conductivity type as the subsurface plurality. The device is programmed by implanting impurities of the same conductivity type as the semiconductor body between selected crossing points. No contacts exists in the array.