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. 22, 1983
Filed:
May. 15, 1980
Armand J van Velthoven, Manitou Springs, CO (US);
NCR Corporation, Dayton, OH (US);
Abstract
A volatile/non-volatile dynamic RAM cell and system in which the cell comprises a storage capacitor for volatilely storing binary information during normal RAM operation; an alterable-threshold storage capacitor for non-volatilely storing the information in non-volatile fashion during power off conditions; and an energy barrier between the two capacitors. Information can be restored to the volatile capacitor either by CCD charge transfer or by charge-pumped operation. The energy barrier facilitates efficient charge pumped restore of information. In one embodiment, the energy barrier is a high concentration substrate surface region having the same conductivity type as the substrate. Alternatively, the alterable-threshold non-volatile capacitor and the energy barrier are provided by a split-gate capacitor which has an alterable threshold non-volatile section (the non-volatile capacitor) and a non-alterable threshold section (the energy barrier).
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile