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.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
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 Minnesota Mining and Manufacturing CofiledCriticalMinnesota Mining and Manufacturing Co
Priority to ES0077383UpriorityCriticalpatent/ES77383U/es
Publication of ES77383UpublicationCriticalpatent/ES77383U/es
Material magnético que sirve para hacer un elemento de cinta registradora magnética, caracterizado porque contiene particular de óxido de hierro acicular reducido, magnéticamente estable, que tiene una fuerza coercitiva de 220 a 360 oersted cuando se obtienen sometiéndolas a la, acción de un gas reductor, tal como se ha indicado anteriormente, a temperaturas elevadas, hasta que las particular de óxido de hierro se ponen negras.