Minnesota Mining and Manufacturing Company

Imation Corporation

Gunther H Dierssen

Ronald S Sapieszko

David M Hopstock

John S Roden

Robert D Kampfer

David E Broberg

Donley D Rowenhorst

Thomas Gabor

The present invention provides a hexagonal magnetic ferrite pigment suitable for high density magnetic recording applications. The pigment is characterized by small particle size, a modified magnetoplumbite structure, and relatively high magnetic moment. The pigment is capable of being prepared by firing suitable precursor particles in air at temperatures below 850.degree. C.

Hexagonal magnetic ferrite pigment for high density magnetic recording

Process of making hexagonal magnetic ferrite pigment for high density

Improved granular abrasive material comprises silicon carbide particles at least partially coated with an integral, durable surface layer of a hard refractory material comprising metal nitride or carbide. Hard refractory materials which provide a useful coating include, for example, silicon nitride or carbide, titanium nitride or carbide, sialon, and others. The surface layer is preferably provided by chemical vapor deposition, most preferably utilizing a fluidized bed. The improved granular abrasive material is particularly useful in various abrasive products such as coated abrasive products, nonwoven abrasive products and abrasive grinding wheels.

Granular silicon carbide abrasive grain coated with refractory material,

Thermomechanical candle snuffer utilizes staff of material such as 55-Nitinol which, when heated by candle flame, elevates slideably engaged cap which falls over candle extinguishing it.

Thermomechanical candle snuffer

Growing community of inventors

White Bear Lake, MN, United States of America

Gunther H Dierssen