Granted Patent
Utility
US 5,111,640 · App. 07/573,702
Packaging container and packaging method of acrylamide crystal
Inventors:
Mareo Tokunaga, Wataru Isozaki
Patented Case
View Patent ↗
Granted: May 12, 1992
Filed: Aug 28, 1990
Inventors
Mareo Tokunaga
Wataru Isozaki
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.