Granted Patent
Utility
US 5,171,512 · App. 07/666,064
Melt-blowing method having notches on the capillary tips
Inventors:
Takayuki Mende, Takanobu Sakai
Patented Case
View Patent ↗
Granted: Dec 15, 1992
Filed: Mar 7, 1991
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.