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/en
Publication of ES77383UpublicationCriticalpatent/ES77383U/en
Magnetic material used to make an element of magnetic recording tape, characterized in that it contains particular acicular iron oxide reduced, magnetically stable, which has a coercive force of 220 to 360 oersted when obtained by subjecting them to the action of a reducing gas, as indicated above, at elevated temperatures, until the particular iron oxide turns black. (Machine-translation by Google Translate, not legally binding)
ES0077383U1959-11-281959-11-28Magnetic material (Machine-translation by Google Translate, not legally binding)
PendingES77383U
(en)