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:
Jul. 11, 2000
Filed:
Jul. 09, 1997
Emilio Ghio, Cambiago, IT;
Giuseppe Meroni, Agrate Brianza, IT;
STMicroelectronics S. r. l., Agrate Brianza, IT;
Abstract
The invention relates to a method of automatically shifting from the fabrication of an EPROM cell to the fabrication of a ROM cell, which method is specifically intended for semiconductor electronic circuits having a resident memory and is of the type wherein the structure of at least one memory cell transistor is defined on a semiconductor substrate using photolithographic techniques including an active area and a channel region, the cell being adapted to acquire a logic state selected by the user. Advantageously, the conductivity of the active area is changed to suit the logical contents that the cell is intended to contain.