Granted Patent
Utility
US 5,736,024 · App. 08/826,151
Method for removing heavy metal ions dissolved in a solution
Inventor:
Hirofumi Seo
Patented Case
View Patent ↗
Granted: Apr 7, 1998
Filed: Mar 27, 1997
Inventor
Hirofumi Seo
Assignee (at issue)
NEC CORPORATION
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.