8.
    发明专利
    未知

    公开(公告)号:DE3761253D1

    公开(公告)日:1990-02-01

    申请号:DE3761253

    申请日:1987-09-17

    Abstract: Chemical beneficiation of coal and other carbonaceous solids utilizing hydrofluoric acid and ammonium chloride.

Patent Agency Ranking