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. 28, 1995
Filed:
Aug. 20, 1993
Shinichi Uramoto, Hyogo, JP;
Tetsuya Matsumura, Hyogo, JP;
Masahiko Yoshimoto, Hyogo, JP;
Kazuya Ishihara, Hyogo, JP;
Hiroshi Segawa, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A read only memory includes a memory cell provided at an intersection between a word line and a bit line, and a plurality of reference potential transmission lines each receiving a reference potential determined in accordance with an externally applied potential designating signal. The memory cell includes a transistor element having a gate coupled to a word line, a drain coupled to a bit line and a source which is coupled to one of the reference potential transmission lines or is held in an open state. Stored data in the memory cell is changed by switching the potentials of the reference potential transmission lines. This enables storing of different data bits in one memory cell.