Expired European patentEurope
A method for programming a single eprom or flash memory cell to store multiple levels of data that utilizes a forward-biased source-to-substrate junction
EP 0764328 B1 · Applicant: NATIONAL SEMICONDUCTOR CORPORATION
Overview
The published document from the EPO: abstract, claims, description and drawings. Open it full size
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Listed from its EPO record in Patent Yard's archive of European patents past their term. Its claims, description and drawings are in the EPO PDF and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed February 14, 1996 and granted December 19, 2001. A European patent lasts at most 20 years from filing, so its term ended February 14, 2016.
- A supplementary protection certificate, which can extend a medicine or crop-protection patent, adds at most five and a half years, so even that would have ended by August 14, 2021.
- We check European rights only. A US or other national patent in its family could still be in force: check its family on Espacenet or Google Patents.
FiledFebruary 14, 1996
PublishedMarch 26, 1997
GrantedDecember 19, 2001
Term endedFebruary 14, 2016
Application numberEP 96907059
Classification (CPC)G11C11/5621 +2 more
Timeline
Timeline From EPO dates
Sources & verification
Official EPO records
Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.