{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8493793","patent":{"patent_number":"US-8493793","title":"Nonvolatile memory device and erasure method thereof","assignee":null,"inventors":[],"filing_date":"2011-07-27T00:00:00.000Z","publication_date":"2013-07-23T00:00:00.000Z","cpc_codes":["G11C","G11C","G11C"],"num_claims":20,"abstract":"A method in performing an erasure operation of a nonvolatile memory device includes a step of performing a block erasure operation wherein a plurality of memory cells in a selected block are erased at once, a step of selecting an over-programmed memory cell having a threshold voltage higher than an upper bound verification voltage, and a step of erasing selectively the over-programmed memory cell. A nonvolatile memory device comprises a cell array comprising a plurality of memory cells wherein the memory cells have a desired threshold voltage distribution for a state of being erased, wherein the distribution spreads over between a lower bound verification voltage and an upper bound verification voltage, a voltage generator configured to provide a word line voltage and a bit line voltage to word lines and bit lines of the plurality of memory cells respectively, a write driver and sense amplifier configured to write data or read out data through bit lines of the plurality of memory cells, and a control logic configured to control the voltage generator and the write driver and sense amplifier to perform a post-erasure operation of selecting and erasing an over-programmed memory cell having a threshold voltage higher than the upper bound verification voltage."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Nonvolatile memory device and erasure method thereof","description":"A method in performing an erasure operation of a nonvolatile memory device includes a step of performing a block erasure operation wherein a plurality of memory cells in a selected block are erased at","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8493793","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-8493793","citation_suggestion":"Patentable. \"Nonvolatile memory device and erasure method thereof\" (US-8493793). https://patentable.app/patents/US-8493793","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8493793","json":"https://patentable.app/api/llm-context/US-8493793","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-30T19:15:53.454Z"}