E.i. Dupont De Nemours and Company

Lewis Clinton Bancroft

Michael Patrick Chouinard

Dale M Hiller

David W Williston

Thermoremanent duplication of a magnetic tape particularly adapted to laser heating whereby a copy tape is heated and cooled, for example, in a nip of two rolls while in contact with a master tape.

Process for thermoremanent duplication of magnetic tapes using

CrO.sub.2 synthesized by the known hydrothermal reaction of CrO.sub.3 /Cr.sub.2 O.sub.3 /H.sub.2 O mixtures (including minor dopants) by the use of a reaction vessel having a hollow longitudinal core open at both ends. The core may have a cross section of convenient size and shape. This process results in shortened heating and cool/vent/dry cycles resulting in increased overall productivity despite the apparent reduced volume of the reaction vessel.

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Wilmington, DE, United States of America

Lewis Clinton Bancroft