JOHN LEAHY
Alcoholic Beverages Control in Burlington, MA
License number
Massachusetts SP-LIC-006630
Issued Date
Jan 1, 2016
Expiration Date
Dec 31, 2016
Type
Salesman Permit
Address
Address
Burlington, MA 01803
Professional information
Apparatus And Method For Disorienting Magnetic Particles In Magnetic Recording Media
US Patent:
4518627, May 21, 1985
Filed:
Sep 4, 1984
Appl. No.:
6/646770
Inventors:
James Foley - Wellesley MA
Fawwaz Habbal - Cambridge MA
John Leahy - Burlington MA
Fawwaz Habbal - Cambridge MA
John Leahy - Burlington MA
Assignee:
Polaroid Corporation - Cambridge MA
International Classification:
H01F 1002
US Classification:
427 48
Abstract:
An apparatus and method are provided for magnetically disorienting magnetic particles in a magnetic layer of a web coated recording medium that is designed to be used in the manufacture of flexible disks. Disorientation is achieved by subjecting the particles in a fluid pigment carried on a linear web to a rotating magnetic field that projects into the plane of the fluid layer and is rotated about an axis perpendicular to the plane. The interaction of the rotating field with the magnetic particles also has a smoothing effect on the outer surface of the magnetic layer.