Granted Patent
Utility
US 4,729,772 · App. 06/936,771
Separation method of polymer powder and carrier gas
Inventors:
Tadashi Asanuma, Yoshiyuki Funakoshi, Kaneo Ito, Akihiko Nakajima
Patented Case
View Patent ↗
Granted: Mar 8, 1988
Filed: Dec 2, 1986
Inventors
Tadashi Asanuma
Yoshiyuki Funakoshi
Kaneo Ito
Akihiko Nakajima
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.