{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9685917","patent":{"patent_number":"US-9685917","title":"Vacuum tube high fidelity headphone","assignee":null,"inventors":[],"filing_date":"2016-09-21T00:00:00.000Z","publication_date":"2017-06-20T00:00:00.000Z","cpc_codes":["H04R","H04R","H04R","H04R","H04R","H04R","H04R"],"num_claims":20,"abstract":"A hi-fi headphone device with two speakers, an integrated pentode vacuum tube, and a battery. The battery is electrically connected to direct and bias circuits, to provide proper voltage to the vacuum tube amplifiers, wherein input signal is amplified and output to buffer circuits and impedance is matched between the tube and output speaker terminals."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Vacuum tube high fidelity headphone","description":"A hi-fi headphone device with two speakers, an integrated pentode vacuum tube, and a battery. The battery is electrically connected to direct and bias circuits, to provide proper voltage to the vacuum","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9685917","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-9685917","citation_suggestion":"Patentable. \"Vacuum tube high fidelity headphone\" (US-9685917). https://patentable.app/patents/US-9685917","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9685917","json":"https://patentable.app/api/llm-context/US-9685917","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T18:29:56.587Z"}