Patent of invention: Method for producing ferroso-ferric oxide with steel rolling oil sedements

No. 35828

Total 2 pages

Certificate for Invention Patent

Title of invention: Method for producing ferrosso-ferric oxide with steel rolling oil sediments

Inventor: Wan Xiaoping

Patent No. ZL 94 1 09304.2 International patent main classification No. C01G 49/06

Date of patent application: August 1, 1994

Patentee: WISCO

The patent has been examined and checked by the Office according to the Patent Law of the People’s Republic of China, now the patent right is granted accordingly.

Director: Gao Lulin (signature)

Patent Office of the People’s Republic of China(seal)

January 11, 1997

Special Seal for Deducting Stamp Tax of Beijing Haidian District Local Taxation Bureau, Bureau of Patent of China (seal)