Granted Patent
Utility
US 4,500,652 · App. 06/410,682
Process for producing cation exchange resins without swelling during sulphonation process
Inventors:
Yoshiharu Misaka, Takeshi Teraue, Masamiti Hatae
Patented Case
View Patent ↗
Granted: Feb 19, 1985
Filed: Aug 23, 1982
Inventors
Yoshiharu Misaka
Takeshi Teraue
Masamiti Hatae
Assignee (at issue)
Mitsubishi Chemical Industries, 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.