Granted Patent
Utility
US 4,826,415 · App. 07/110,787
Melt blow die
Inventor:
Takayuki Mende
Patented Case
View Patent ↗
Granted: May 2, 1989
Filed: Oct 21, 1987
Inventor
Takayuki Mende
Assignee (at issue)
Mitsui Petrochemical 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.