A magnetic read/record head having a layer of uniaxially anisotropic magnetic material as the pole faces, which increases the ratio of magnetic reluctance between the pole faces to the magnetic reluctance along the fringing flux path through the recording medium. Two embodiments of the invention are disclosed, one embodiment providing a layer of anisotropic magnetic material in a continuous layer around a complete loop from one pole face to the other pole face, and the other embodiment providing...

A magnetic card comprises (1) a planar substrate having at least a surface layer of a thermoplastic resin, (2) a magnetic layer disposed at at least one part of a surface of the planar substrate, (3) a color layer disposed on the magnetic layer, and (4) a pattern layer disposed on the color layer. In this magnetic card, the color of the magnetic layer which does not contribute to an attractive appearance is hidden under the color layer, and, because the pattern layer is disposed on the color lay...

Magnetic recording media including permanent structures of aligned acicular particles have been proposed as a means of identifying and authenticating a medium. A structure of such a media by which information can be recorded and read-out without interference from the structural remanence difference is described. An apparatus and method for the examination of such media for their permanent structures, particularly when used in security documents such as credit cards, are also described.

Suspended contaminated particles are removed by magnetic separation from a liquid containing ferromagnetic particulate material to which the particles adhere. A plurality of radially extending filter discs are provided on a horizontally disposed rotatable shaft for rotation therewith, the liquid being directed toward the discs and through gaps provided therebetween. Permanent magnets are provided on the discs for producing local magnetic field gradients in the gaps, and the discs have non-magnet...

A magnetic head for use with a tape recorder or the like comprises a core having a gap and which has a non-magnetic material of a similar mechanical property as the core material bonded to the periphery or part thereof, thereby preventing a foul-up of the head surface with dusts and avoiding damage to the magnetic tape; the foul-up or the damage occurs when the periphery of the core is filled with a layer of synthetic resin adhesive.

A magnetic flowmeter whose electromagnet is excited by a low-frequency excitation current having an a-c component and a d-c component, the flowmeter including flow tube electrodes yielding a flow rate signal. A reference-voltage detecting transformer is provided to produce a reference-voltage proportional to the a-c component of the excitation current. Fluctuations in the flow rate signal as a result of fluctuations in the a-c component of the excitation current are eliminated by dividing the fl...

Magnetic recording media including permanent structures of aligned acicular particles have been proposed as a means of identifying and authenticating a medium. A structure which has an improved remanence difference signal is described. A method of making and examining such a structure is described. Arrangements of such media and record / read-out apparatus by which information can be recorded and read-out without interference from the structural remanence differences are described. The use of th...

A magnetic separator comprises a magnet and an iron cylinder rotatable in a gap in the magnet. The cylinder and the lower pole face of the magnet define a separator chamber. An aqueous suspension of magnetizable and non-magnetic particles is supplied to the separator chamber through channels extending through the magnet.

In a magnetic head having a tape contact face, a non-ferromagnetic unitary housing has a cavity for receiving a coil and has a slot for receiving at least one C-core of the magnetic circuit. The slot extends in a side face of the housing and debouches at one end into the cavity and at the other end into the tape contact face.

A magnetic tool for releaseably securing thereto metallic members which are magnetically attractable. The magnetic tool includes a magnetic element securely fastened to a first handle section. The first handle section is removably mounted to a telescoping handle portion of the magnetic tool. The telescoping portion of the magnetic tool allows for extended longitudinal length adjustment of the magnetic tool for the purpose of picking up metallic members from a base surface which is substantially ...