{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9804609","patent":{"patent_number":"US-9804609","title":"Mass flow controllers and methods for auto-zeroing flow sensor without shutting off a mass flow controller","assignee":null,"inventors":[],"filing_date":"2012-02-22T00:00:00.000Z","publication_date":"2017-10-31T00:00:00.000Z","cpc_codes":["G05D","G01N"],"num_claims":10,"abstract":"An MFC includes: a proportional valve; a mass flow sensor; a first flow line connecting from an outlet of the proportional valve through the mass flow sensor to an exit line; a second flow line joining the first flow line at a first junction located upstream of the mass flow sensor and at a second junction located downstream of the mass flow sensor; a switching valve placed such that the switching valve can regulate a flow of a gas through the first flow line or the second flow line; and a control device connected to provide a feedback control loop for regulating the proportional valve based on signals measured by the mass flow sensor, wherein the control device includes a program for keeping a rate of a flow exiting the exit line substantially constant when the flow is through the second flow line."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Mass flow controllers and methods for auto-zeroing flow sensor without shutting off a mass flow controller","description":"An MFC includes: a proportional valve; a mass flow sensor; a first flow line connecting from an outlet of the proportional valve through the mass flow sensor to an exit line; a second flow line joinin","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9804609","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-9804609","citation_suggestion":"Patentable. \"Mass flow controllers and methods for auto-zeroing flow sensor without shutting off a mass flow controller\" (US-9804609). https://patentable.app/patents/US-9804609","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9804609","json":"https://patentable.app/api/llm-context/US-9804609","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T09:15:25.209Z"}