{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8502641","patent":{"patent_number":"US-8502641","title":"Rate-of-change switches and controllable apparatus","assignee":null,"inventors":[],"filing_date":"2001-03-07T00:00:00.000Z","publication_date":"2013-08-06T00:00:00.000Z","cpc_codes":["G05B"],"num_claims":24,"abstract":"A switching function is performed in response to a predetermined rate-of-change of an output signal, thereby providing rate-of-change switching. Rate-of-change switches (63 and 154) each include a user-controlled transducer (38A, 38B, or 39), a differentiator (40A, 40B, 112, or 156), and a discriminator (42, 114, 134, 160, or 162). The rate-of-change switches (63 and 154) perform at least one switching function when an output from the differentiator (40A, 40B, 112, or 156) or a second differentiator (158) exceeds an allowable magnitude. The rate-of-change switches (63 and 154) may be used to control a timed-opportunity switch (26 or 172), a conveyance, such as a wheelchair (12), and such functions as extending and retracting leg supports, and/or an environmental control unit (14 or 174). The rate-of-change switches (63 or 154) may be attached to a body member (18, 64, or 67) and be actuated by body-member gestures."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Rate-of-change switches and controllable apparatus","description":"A switching function is performed in response to a predetermined rate-of-change of an output signal, thereby providing rate-of-change switching. Rate-of-change switches (63 and 154) each include a use","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8502641","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-8502641","citation_suggestion":"Patentable. \"Rate-of-change switches and controllable apparatus\" (US-8502641). https://patentable.app/patents/US-8502641","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8502641","json":"https://patentable.app/api/llm-context/US-8502641","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-30T16:21:46.183Z"}