Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NGK Insulators Ltd
Original Assignee
NGK Insulators 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 as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NGK Insulators LtdfiledCriticalNGK Insulators Ltd
Priority to JP22849984ApriorityCriticalpatent/JPS61106738A/ja
Priority to US06/776,454prioritypatent/US4692192A/en
Priority to EP85307773Aprioritypatent/EP0180443B1/en
Priority to DE8585307773Tprioritypatent/DE3575230D1/de
Publication of JPS61106738ApublicationCriticalpatent/JPS61106738A/ja
Publication of JPS634889B2publicationCriticalpatent/JPS634889B2/ja