公开(公告)号：US2813256A

公开(公告)日：1957-11-12

申请号：US45337654

申请日：1954-08-31

Applicant: PHILIPS CORP

Inventor： SIMON DUINKER ,  OOSTERHOUT GERARD WILLEM VAN

IPC: H01F21/08 ,  H01F29/14 ,  H03F9/00

CPC classification number: H01F21/08 ,  H01F29/146 ,  H01F2003/103 ,  H03F9/00

公开(公告)号：US3598568A

公开(公告)日：1971-08-10

申请号：US3598568D

申请日：1969-01-29

Applicant: PHILIPS CORP

Inventor： KLOMP CORNELIS JOHANNES ,  OOSTERHOUT GERARD WILLEM VAN

IPC: G11B5/706 ,  H01F1/06 ,  B22F9/00

CPC classification number: H01F1/065 ,  G11B5/70615 ,  G11B5/70668

Abstract: A METHOD OF PREPARING MAGNETICALLY STABLE IRON POWDER SUITABLE FOR MAGNETIC RECORDING IN WHICH IRON OXIDE HYDRATE, A-FEOI(OH) IS PRECIPITATED FROM A STRONGLY REACTING ALKALINE SOLUTION OF FERROUS HYDROXIDE CONTAINING AT LEAST ONE COMPOUND OF AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF GERMANIUM, TIN AND ALUMINUM IN SUCH A CONCENTRATION THAT THE ATOMIC RATION OF THE LATTER METAL TO FE IN THE SOLUTION IS A LEAST 0.005 WHILE PASSING AN OXIDIZING GAS THROUGH THE SOLUTION. THE PRECIPITATE IS THEREAFTER SEPARATED FROM THE LIQUID, WASHED, DRIED, AND REDUCED IN HYDROGEN AT 250* TO 500* C.

公开(公告)号：US2862891A

公开(公告)日：1958-12-02

申请号：US51838855

申请日：1955-06-27

Applicant: PHILIPS CORP

Inventor： HEINRICH JONKER GERARD ,  OOSTERHOUT GERARD WILLEM VAN ,  SANTEN JAN HEINRIK VAN

IPC: C04B35/01 ,  C04B35/26 ,  H01C7/00 ,  H01C7/04

CPC classification number: C04B35/01 ,  C04B35/2608 ,  C04B35/2616 ,  H01C7/00 ,  H01C7/001 ,  H01C7/045

公开(公告)号：US2818551A

公开(公告)日：1957-12-31

申请号：US40243254

申请日：1954-01-06

Applicant: PHILIPS CORP

Inventor： OOSTERHOUT GERARD WILLEM VAN ,  WOLFGANG RATHENAU GERHART ,  JAN SMIT

IPC: C04B35/26 ,  H01F1/03

CPC classification number: H01F1/0315 ,  C04B35/265

公开(公告)号：US3679476A

公开(公告)日：1972-07-25

申请号：US3679476D

申请日：1970-04-01

Applicant: PHILIPS CORP

Inventor： OOSTERHOUT GERARD WILLEM VAN ,  LEMMEN HENDRIKUS JOHANNES ,  KLOMP CORNELIS JOHANNES

IPC: B05C11/04 ,  B05C5/02 ,  B05D3/04 ,  B05D7/04 ,  G11B5/842 ,  G11B5/848 ,  H01F10/00

CPC classification number: B05C5/0254 ,  B05D3/0486 ,  B05D7/04 ,  G11B5/842 ,  Y10S428/90

Abstract: A METHOD OF COATING A SUPPORT BASE OF A SYNTHETIC MATERIAL, WITH A LAYER OF LACQUER FOR PARTICULAR APPLICATION IN MANUFACTURING MAGNETIC TAPE. THE LACQUER IS FORCED THROUGH A POURING SLIT INTO A PRESSURE CHAMBER WHERE IT IS TEMPORARILY STORED IN CONTACT WITH THE SUPPORT BASE. THE SUPPORT IS GUIDED ALONG THE STORED LACQUER UNDER A TENSILE STRESS AND THE SUPPORT WITH THE ADHERING LAYER OF LACQUER IS THEN GUIDED ALONG A SMOOTHING SIDE IN SUCH MANNER THAT THE PARTS OF THE SUPPORT IN FRONT OF AND BEHIND THE SMOOTHING SIDE FORM AN ANGLE SO THAT THE LAYER IS EQUALIZED. THE PRESSURE IN THE PRESSURE CHAMBER CAN BE CONTROLLED BY CONTROLLING THE ANGLE, THE TENSILE STRESS AND THE QUANTITY OF LACQUER SUPPLIED PER UNIT OF TIME SO THAT THE THICKNESS OF THE LAYER IS ALSO CONTROLLED.