![]() Application granted granted Critical Publication of US4769610A publication Critical patent/US4769610A/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links ![]() Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by Motorola Inc filed Critical Motorola Inc Priority to US07/067,750 priority Critical patent/US4769610A/en Assigned to MOTOROLA, INC. Original Assignee Motorola Inc Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) ![]() Weiss Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US07/067,750 Inventor Karl R. Google Patents US4769610A - Tone decoderÄownload PDF Info Publication number US4769610A US4769610A US07/067,750 US6775087A US4769610A US 4769610 A US4769610 A US 4769610A US 6775087 A US6775087 A US 6775087A US 4769610 A US4769610 A US 4769610A Authority US United States Prior art keywords tone frequency correlator correlators detecting Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.
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