Granted Patent
Utility
US 5,017,112 · App. 07/327,252
Melt-blowing die
Inventors:
Takayuki Mende, Takanobu Sakai
Patented Case
View Patent ↗
Granted: May 21, 1991
Filed: Mar 22, 1989
Inventors
Takayuki Mende
Takanobu Sakai
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.