Granted Patent
Utility
US 6,040,388 · App. 08/966,439
Copolymer, hydrogenated product thereof, and process for producing the same
Inventors:
Koichi Nishimura, Tatsuya Kawamura, Toyozo Fujioka
Patented Case
View Patent ↗
Granted: Mar 21, 2000
Filed: Nov 10, 1997
Inventors
Koichi Nishimura
Tatsuya Kawamura
Toyozo Fujioka
Assignee (at issue)
Idemitsu Petrochemical Co., 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.