Granted Patent
Utility
US 4,975,313 · App. 07/516,135
Heat-shrinkable polyolefin composite sheet
Inventors:
Hiroshi Ezawa, Takayuki Watanabe, Hiroaki TSUSHIMA, Zyuzo Nishiba
Patented Case
View Patent ↗
Granted: Dec 4, 1990
Filed: Apr 27, 1990
Inventors
Hiroshi Ezawa
Takayuki Watanabe
Hiroaki TSUSHIMA
Zyuzo Nishiba
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.