Back to results
US 5,204,801 AGranted
Degaussing technique
AssigneeGarner Industries, Inc.
InventorsDonald G. Becker, David J. Etherton
Life of this patent
Estimating the term…
Abstract
To degauss cassettes of magnetic tape, a magnetic field is applied to the magnetic material with a flux density of at least 1,000 gauss and at an angle between 20 degrees and 50 degrees from the horizontal of the magnetic tape for a time period of at least one second and the field is alternated at a frequency of at least ten hertz. The magnetic material may be rotated while it is in the field.
Claims8
A method of degaussing magnetic material comprising the steps of:
- applying a magnetic field to the magnetic material with a flux density of at least 1,000 gauss and at an angle between 20 degrees and 50 degrees for a time period of at least one second;
- and
- alternating the field at a frequency of at least ten hertz.
Apparatus for degaussing magnetic material comprising:
- means for applying a magnetic field to the magnetic material with a flux density of at least 1,000 gauss and at an angle between 20 degrees and 50 degrees for a time period of at least one second;
- and
- means for alternating the field at a frequency of at least ten hertz.
Dependencies are inferred from the claim text.