公开(公告)号：DE3727604A1

公开(公告)日：1988-05-26

申请号：DE3727604

申请日：1987-08-19

Applicant: BASF AG

Inventor： SCHNEIDER WALTER ,  KULLMANN UDO DR ,  JAKUSCH HELMUT DR ,  KOESTER EBERHARD DR ,  NERSCHBACH GERHARD ,  PFEFFERKORN DIETMAR ,  PFIRRMANN VIKTOR DR

IPC: G11B5/024 ,  G11B5/008

Abstract: At least one magnetic-tape reel (2) can be moved by means of a conveying device (3) through a long cylindrical coil (1) (air-cored coil) which can be connected to a power source. In this case, the axis of the cylindrical coil is arranged transversely with respect to the plane of the reel, so that the magnetic lines of flux run transversely with respect to the tape reel.

公开(公告)号：DE3343107A1

公开(公告)日：1985-06-05

申请号：DE3343107

申请日：1983-11-29

Applicant: BASF AG

Inventor： DORSCH CHRISTINE ,  HEILMANN PETER DR ,  KULLMANN UDO DR ,  MAYER DIETER DR ,  GRAU WERNER DR

IPC: G11B5/66 ,  G11B5/64 ,  G11B5/72 ,  H01F10/26 ,  B05D5/12 ,  C23C13/02

Abstract: Magnetic recording media possess, on a dimensionally stable base which may or may not be provided with a non-magnetic lower layer, a thin ferromagnetic metal layer on which a protective layer consisting of a silicon monoxide/chromium dual coating is applied.

公开(公告)号：DE3273566D1

公开(公告)日：1986-11-06

申请号：DE3273566

申请日：1982-07-16

Applicant: BASF AG

Inventor： HIBST HARTMUT DR ,  KULLMANN UDO DR

IPC: C01G49/00 ,  C01G51/00 ,  C01G53/00 ,  C04B35/00 ,  G11B5/706 ,  H01F1/11 ,  H01F1/36

Abstract: A process for the preparation of finely divided ferrites of the general formula MeFe2O4(I) where Me=aMn+bNi+cZn+dCo+eFe(II), and the atomic weight ratios a, b, c, d and e are each from 0 to 1 and their sum is 1, or M21Me21Fe12O22(II) where M1 is barium, strontium, calcium and/or lead, and Me1 is divalent manganese, copper, iron, cobalt, nickel, zinc, magnesium and/or equimolar amounts of lithium and trivalent iron, or M2(Me2Ti)xFe12-2xO19(III) where M2 is barium or strontium, Me2 is zinc, nickel and/or cobalt and x is from 0 to 1.5, wherein the aqueous solutions of the salts required for the particular composition are reacted with an aqueous solution of sodium carbonate and/or potassium carbonate, the water is removed, the dry salt mixture is heated at from 800 DEG to 1200 DEG C., and the resulting finely divided ferrite of the predetermined composition is isolated by leaching with water.

公开(公告)号：DE3477079D1

公开(公告)日：1989-04-13

申请号：DE3477079

申请日：1984-11-22

Applicant: BASF AG

Inventor： GUETTNER CHRISTINE ,  HEILMANN PETER DR ,  KULLMANN UDO DR ,  MAYER DIETER DR ,  GRAU WERNER DR

IPC: G11B5/66 ,  G11B5/64 ,  G11B5/72

Abstract: Magnetic recording media possess, on a dimensionally stable base which may or may not be provided with a non-magnetic lower layer, a thin ferromagnetic metal layer on which a protective layer consisting of a silicon monoxide/chromium dual coating is applied.

公开(公告)号：DE3413752A1

公开(公告)日：1985-10-24

申请号：DE3413752

申请日：1984-04-12

Applicant: BASF AG

Inventor： STECK WERNER DR ,  FESER RAINER DR ,  JAKUSCH HELMUT DR ,  RUDOLF PETER DR ,  VAETH GUENTHER ,  KULLMANN UDO DR

IPC: C01G49/00 ,  G11B5/706 ,  H01F1/10 ,  B05D5/12 ,  C04B35/26 ,  G11B5/62 ,  H01F10/20