A sustained release device which comprises a source of at least one trace chemical element incorporated in a cement and releasable therefrom on contact with an aqueous medium. A preferred cement is copper phosphate cement.
申请公布号
US4661339(A)
申请公布日期
1987.04.28
申请号
US19850707958
申请日期
1985.03.04
申请人
NATIONAL RESEARCH DEVELOPMENT CORP.
发明人
ALLEN, WILLIAM M.;SANSOM, BERNARD F.;WILSON, ALAN D.;PROSSER, HAVARD J.;GROFFMAN, DAVID M.
