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:
Aug. 19, 1980
Filed:
Oct. 03, 1978
Yukio Furuta, Kusatsu, JP;
Tomisaburo Okumura, Kyoto, JP;
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Abstract
A non-volatile memory control circuit for reprogramming non-volatile memory devices before their natural decay causes their '1' and '0' levels to become indistinguishable. Signals representing the memory states of the non-volatile memory devices are temporarily stored while the non-volatile memory devices are erased. After erasure the memory states are rewritten into the non-volatile memory devices. After rewriting, the control circuit is automatically reset. The erase/write operation is triggered by interrogating a second set of 'parallel' non-volatile memory devices containing a predetermined data pattern, the interrogation occurring with a threshold detection level greater than that at which the memory levels of the primary non-volatile devices become indistinguishable.