Assignors: KUMADA, AKIO, NAKAMURA, SHIGEO Application granted granted Critical Publication of US4352961A publication Critical patent/US4352961A/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 Priority claimed from JP54-74698 external-priority Priority claimed from JP7469879A external-priority patent/JPS56800A/en Priority claimed from JP5422680A external-priority patent/JPS56152399A/en Application filed by Hitachi Ltd filed Critical Hitachi Ltd Assigned to HITACHI, LTD., A COMPANY OF JAPAN reassignment HITACHI, LTD., A COMPANY OF JAPAN ASSIGNMENT OF ASSIGNORS INTEREST. Original Assignee Hitachi Ltd 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.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US06/155,228 Inventor Akio Kumada Shigeo Nakamura Current Assignee (The listed assignees may be inaccurate. Google Patents Transparent flat panel piezoelectric speakerÄownload PDF Info Publication number US4352961A US4352961A US06/155,228 US15522880A US4352961A US 4352961 A US4352961 A US 4352961A US 15522880 A US15522880 A US 15522880A US 4352961 A US4352961 A US 4352961A Authority US United States Prior art keywords resonator transparent shape flat panel transparent flat Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US4352961A - Transparent flat panel piezoelectric speaker US4352961A - Transparent flat panel piezoelectric speaker
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