Granted Patent
Utility
US 5,180,768 · App. 07/657,383
Composition comprising polymer of 4-methyl-pentene-1
Inventor:
Hiromi Sigemoto
Patented Case
View Patent ↗
Granted: Jan 19, 1993
Filed: Feb 19, 1991
Inventor
Hiromi Sigemoto
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.