Granted Patent
Utility
US 4,636,554 · App. 06/681,102
Process for producing a chloromethylated polymer
Inventors:
Akira Tada, Takamitsu Morita, Takeshi Teraue, Yoshihiro Kusumoto
Patented Case
View Patent ↗
Granted: Jan 13, 1987
Filed: Dec 13, 1984
Inventors
Akira Tada
Takamitsu Morita
Takeshi Teraue
Yoshihiro Kusumoto
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.