Granted Patent
Utility
US 4,277,565 · App. 06/025,102
Macromolecular adsorbent containing pendant difluoroalkyl phosphate groups for adsorbing heavy metal ions
Inventors:
Yoshio Oda, Masaaki Yamabe, Masao Kato
Patented Case
View Patent ↗
Granted: Jul 7, 1981
Filed: Mar 29, 1979
Inventors
Yoshio Oda
Masaaki Yamabe
Masao Kato
Assignee (at issue)
ASAHI GLASS CO., LTD.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.