Economical process for producing metal particles for magnetic recording
 Highly orientable acicular iron particles are made by reducing an acicular ferric oxide which has been formed into a porous matrix by combining it with sodium tripolyphosphate and reducing the oxide with hydrogen in the presence of a dehydrating agent. 
Ampex Corporation
B Y C H C
B22F Y02P C21B H01F C21B
inventional additional inventional inventional inventional
Lawrence M. Yu C. William F. Irving W. Hillard M. Michael K.
Scott Lee Acebo Wolf Kahan Stafford