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. 23, 1998
Filed:
May. 08, 1995
Takao Akaogi, Kawasaki, JP;
Hiromi Kawashima, Kawasaki, JP;
Tetsuji Takeguchi, Kawasaki, JP;
Ryoji Hagiwara, Kawasaki, JP;
Yasushi Kasa, Kawasaki, JP;
Kiyoshi Itano, Kawasaki, JP;
Yasushige Ogawa, Kasugai, JP;
Shouichi Kawamura, Kawasaki, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
A flash memory performs channel erasing or source erasing by applying a negative voltage to a control gate. The device includes a voltage restriction device which restricts the negative voltage to be applied to the control gate so that the negative voltage will be a constant value relative to the voltage of the channel or source. Alternatively, two voltage restricting devices restrict the negative voltage applied to the control gate and the voltage to be applied to the source so that the voltages will be a constant value relative to a common reference voltage.