{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9818443","patent":{"patent_number":"US-9818443","title":"Magnetic recording medium having specific underlayer features","assignee":null,"inventors":[],"filing_date":"2016-07-29T00:00:00.000Z","publication_date":"2017-11-14T00:00:00.000Z","cpc_codes":["G11B","G11B"],"num_claims":19,"abstract":"The magnetic recording medium has a nonmagnetic layer satisfying: the ratio of the total area accounted for by voids observed to the area of the observed region falls within a range of 13.0% to 25.0% in a sectional image taken by SEM; R+σr is 58.0 nm or less and R−σr is 21.0 nm or greater when denoting the average value of the diameters of corresponding circles for voids observed in the sectional image as R, denoting the standard deviation of the diameters of the corresponding circles as σr; N+σn is 185 voids/μm2 or less and N−σn is 120 voids/μm2 or greater when denoting the average number of voids observed per μm2 unit area of the observed region in the sectional image as N, denoting the standard deviation of this number as σn; and the thickness of the nonmagnetic layer is 0.20 μm or greater."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Magnetic recording medium having specific underlayer features","description":"The magnetic recording medium has a nonmagnetic layer satisfying: the ratio of the total area accounted for by voids observed to the area of the observed region falls within a range of 13.0% to 25.0% ","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9818443","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-9818443","citation_suggestion":"Patentable. \"Magnetic recording medium having specific underlayer features\" (US-9818443). https://patentable.app/patents/US-9818443","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9818443","json":"https://patentable.app/api/llm-context/US-9818443","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T09:30:52.988Z"}