公开(公告)号：CA748643A

公开(公告)日：1966-12-20

申请号：CA748643D

Applicant: IBM

Inventor： HAINES ROBERT S

公开(公告)号：CA735114A

公开(公告)日：1966-05-24

申请号：CA735114D

Applicant: IBM

Inventor： HAINES ROBERT S ,  WENNER JOHN W ,  BATE GEOFFREY

公开(公告)号：FR2334626A1

公开(公告)日：1977-07-08

申请号：FR7631439

申请日：1976-10-11

Applicant: IBM

Inventor： HAINES ROBERT S

IPC: C01G37/027 ,  C01G37/02 ,  G11B5/706 ,  H01F1/11 ,  G11B5/62

Abstract: PROCESS FOR TREATING CHROMIUM DIOXIDE Ferromagnetic chromium dioxide is normally produced using other chromium compounds as starting materials. In most reactions a Cr(VI) compound, such as chromium trioxide is used in some stage of the procedure. Following the conversion reaction there are inevitably small amounts of the original chromium (VI) ions in the form of salts or oxide compounds which are strongly adsorbed on or attached to the chromium dioxide in a manner which prevents them from being easily removed by normal washing techniques. These Cr(VI) ions, if left in the chromium dioxide can cause problems. These disadvantages have now been overcome by treating the impure chromium dioxide with a peroxide compound in a manner which causes the Cr(VI) ions to change their character and allow their removal from the chromium dioxide.

公开(公告)号：CA967857A

公开(公告)日：1975-05-20

申请号：CA134567

申请日：1972-02-11

Applicant: IBM

Inventor： HAINES ROBERT S

公开(公告)号：CA831435A

公开(公告)日：1970-01-06

申请号：CA831435D

Applicant: IBM

Inventor： HAINES ROBERT S

公开(公告)号：CA915471A

公开(公告)日：1972-11-28

申请号：CA915471D

Applicant: IBM

Inventor： HAINES ROBERT S

IPC: G11B5/706 ,  H01F1/06

公开(公告)号：CA902355A

公开(公告)日：1972-06-13

申请号：CA902355D

Applicant: IBM

Inventor： HAINES ROBERT S

IPC: C01G37/00 ,  C04B35/00 ,  G11B5/70 ,  G11B5/706 ,  H01F1/03

公开(公告)号：CA876626A

公开(公告)日：1971-07-27

申请号：CA876626D

Applicant: IBM

Inventor： HAINES ROBERT S

公开(公告)号：CA767574A

公开(公告)日：1967-09-19

申请号：CA767574D

Applicant: IBM

Inventor： HAINES ROBERT S