The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 30, 1995
Filed:
Jul. 30, 1993
Applicant:
Inventors:
Donald B Ketcham, Lakeville, MN (US);
Robert P McCollam, Roseville, MN (US);
Kent R Kalar, Vadnais Heights, MN (US);
Assignee:
Minnesota Mining and Manufacturing, St. Paul, MN (US);
Primary Examiner:
Int. Cl.
CPC ...
H01F / ;
U.S. Cl.
CPC ...
361151 ; 361267 ; 360 66 ;
Abstract
This method produces a tape having a plurality of recorded segments separated by cue tones and having a reduced tendency to generate false cue tones. The method includes applying a layer of a liquid dispersion to a nonmagnetic substrate. The method also includes the steps of orienting the pigment by applying a magnetic field, solidifying the layer of liquid dispersion on the substrate, and applying a demagnetizing field to the layer to neutralize the remanent magnetization.