Minnesota Mining and Manufacturing Company

John D Hakanson

Gerald J Niles

John V Nowicki

Wayne H Vannet

Triboelectric charging of magnetic record disk jackets causes static electricity to attract and hold foreign matter. This triboelectric charging can be reduced by the application of nonvolatile, non-integral, electrically conductive organic coatings on the surfaces of the jackets.

Static reduction in magnetic record disk assemblies

The provision of non-volatile, electrically conductive organic coatings to the surfaces of cassettes housing magnetic recording tape substantially reduces triboelectric charging.

Static reduction in magnetic recording cassettes

Magnetic heads of color video tape recorder (vtr) machines are cleaned without harmful abrasion by means of a novel magnetic head cleaning tape carrying a color bar signal. Abrupt appearance of the color bar test pattern at the video monitor permits cessation of the cleaning operation immediately upon complete removal of foreign matter and without harmful abrasion of the heads.

Growing community of inventors

South St. Paul, MN, United States of America

John D Hakanson