Granted Patent
Utility
US 5,674,624 · App. 08/168,196
Highly light-transmitting dust protective film, and dust protective member
Inventors:
Tetsuya Miyazaki, Mayumi Kawasaki, Takao Ohno
Patented Case
View Patent ↗
Granted: Oct 7, 1997
Filed: Dec 17, 1993
Inventors
Tetsuya Miyazaki
Mayumi Kawasaki
Takao Ohno
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.