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. 22, 1982
Filed:
Jun. 18, 1980
Harish N Kotecha, Essex Junction, VT (US);
Francis W Wiedman, III, Stowe, VT (US);
International Business Machines Corp., Armonk, NY (US);
Abstract
A memory system is provided for charging and discharging small cells each of which has only three terminals with a charge injector controlled by a low single polarity voltage. Each of the cells includes a transistor having a current carrying electrode and a floating gate, with a control gate arranged so that a first capacitor is serially connected with a second capacitor between the current carrying electrode and the control gate, with one of the capacitors having a substantially larger capacitance than that of the other capacitor and with the other capacitor including a charge injector. The common point between the first and second capacitors is connected to the floating gate. The charge injector may include a single graded or stepped composition region or two such regions disposed near opposite faces or plates of the other capacitor, or more particularly the injector may include silicon rich regions near one or both faces of a layer of silicon dioxide.