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:
Oct. 13, 1987
Filed:
Nov. 22, 1983
Joel A Gerber, St. Paul, MN (US);
Jerry A Sievers, St. Paul, MN (US);
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Abstract
A magnetic pole head for recording and playback is described. Its features, as illustrated in FIG. 1 are: a high permeability core 1, a magnetic field producing means 3, and an acute angle .phi. between the bottom surface and side surface at the trailing portion of the head (i.e. the portion which influences the recording medium 5 last). It has been found that this improved pole head significantly increases the derivative of vertical magnetic field intensity with respect to lateral distance. This increase in the rate at which vertical field intensity changes will allow for higher density perpendicular recording than is feasible with conventional vertical heads.