Beijing
China
3
2019-05-02
The entities that hold a legal rights for patent applications filed by inventor MA Zhifei:
Zhifei MA from Beijing, CN has applied for patents for these inventions. The list has both pending applications and granted patents:
Remediation material for heavy-metal chromium contaminated soil, preparation method and application thereof
#2 | 2016-11-17Medium material and its preparation method for elimination of arsenic pollution from groundwater
#3 | 2015-01-22Double-layer persulfate sustained-release material and its preparation method
1040887 ⎘